chore(spike): recover the /bygge toolchain from tmpfs (#28)

analyze_srt.py, build_page.py and transcode.yaml produced the /bygge
prototype. They were sitting in a session scratchpad on tmpfs, one reboot
from gone, while spike issues #29-#31 were written as if they had to be
built from scratch.

Committed as found, defects documented rather than fixed: max_tokens=6000
truncates anything past ~6 minutes of audio, the page title is hardcoded,
and the schema still carries fields no consumer renders.

The four-check validator is the part worth keeping — the coverage-gap and
Swedish-number-grounding checks catch errors that timestamp and citation
checks structurally cannot.

Real transcripts and analyses stay out: this repo is public and the
recordings are a named person discussing a client's project. Only the
synthetic fixture is committed, which exercises all four checks with no
model call.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BeAp5LTscnz2W7Ubt4eJ6m

.gitea/workflows/ci.yml

@@ -78,16 +78,148 @@ jobs:
               ${REGISTRY}/${{ env.IMAGE }}:${{ steps.meta.outputs.version-tag }} || true
           echo "Image pushed to ${REF}"
 
+      # Run the just-built local image briefly via buildah, not k3s ctr —
+      # avoids sudo/host-containerd access so this still works once the
+      # runner itself is containerized (infra#132). Tests the local
+      # buildah-store image directly, no registry round-trip needed.
+      #
+      # Bare `/tapir` (no subcommand) runs the long-running server, same as
+      # the old ctr-based smoke test -- ctr's --rm reliably force-killed it,
+      # but a plain `timeout N buildah run` does NOT: it only signals the
+      # `buildah run` wrapper, and the actual container process can survive
+      # that and keep the output pipe open, hanging the whole job (hit this
+      # live: 14min hang, infra#132). Backgrounding the run + `buildah rm -f`
+      # decouples "is the script blocked" from "did the process exit" --
+      # rm -f forcibly tears down the container regardless of wrapper state.
       - name: Smoke test
         run: |
           REGISTRY="localhost:5000"
           REF="${REGISTRY}/${{ env.IMAGE }}:${{ steps.meta.outputs.sha-tag }}"
-          CNAME="smoke-${{ steps.meta.outputs.sha-tag }}"
-          sudo k3s ctr images pull --plain-http ${REF}
-          OUTPUT=$(timeout 5 sudo k3s ctr run --rm ${REF} ${CNAME} /tapir 2>&1 || true)
-          sudo k3s ctr containers delete ${CNAME} 2>/dev/null || true
+          CONTAINER=$(buildah from ${REF})
+          LOG=$(mktemp)
+          buildah run "$CONTAINER" -- /tapir > "$LOG" 2>&1 &
+          RUNPID=$!
+          sleep 5
+          kill -9 "$RUNPID" 2>/dev/null || true
+          wait "$RUNPID" 2>/dev/null || true
+          buildah rm -f "$CONTAINER" >/dev/null 2>&1 || true
+          OUTPUT=$(cat "$LOG"); rm -f "$LOG"
           echo "$OUTPUT" | grep -q "tapir" \
             && echo "Smoke test passed" \
             || echo "Smoke test inconclusive: $OUTPUT"
 
-  # ── 3. Mirror to GitHub — skipped for now (SSH key rotation pending) ─
+  # ── 3. Deploy via infra repo + Flux ─────────────────────────────────────────
+  # Flux native image-automation can't scan localhost:5000 from inside k3s pods
+  # (mathias/infra k3s/flux/flux-system/image-automation.yaml) — this job
+  # mirrors cobalt-dingo's proven pattern instead: patch the infra repo's
+  # manifest directly on every push to main, then annotate Flux for a fast
+  # reconcile. Fixes infra#111 (image built+pushed but manifest bump was
+  # manual, so merged features silently didn't deploy).
+  deploy:
+    name: Deploy via GitOps
+    needs: build
+    runs-on: self-hosted
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    environment: staging
+    steps:
+      - name: Update image tag in infra repo
+        env:
+          IMAGE_TAG: ${{ needs.build.outputs.image-tag }}
+          DEPLOY_KEY: ${{ secrets.INFRA_DEPLOY_KEY }}
+        run: |
+          set -euo pipefail
+
+          # INFRA_DEPLOY_KEY is a Gitea org secret (mathias org), already
+          # configured per docs/cd-pipeline.md in the infra repo — same key
+          # cobalt-dingo and brain-gardener use, no new secret needed.
+          mkdir -p ~/.ssh
+          echo "$DEPLOY_KEY" > ~/.ssh/id_infra
+          chmod 600 ~/.ssh/id_infra
+          ssh-keyscan -p 30022 10.0.1.20 >> ~/.ssh/known_hosts 2>/dev/null
+
+          export GIT_SSH_COMMAND="ssh -i ~/.ssh/id_infra -o IdentitiesOnly=yes"
+          rm -rf /tmp/infra
+          git clone -b main ssh://git@10.0.1.20:30022/mathias/infra.git /tmp/infra
+          cd /tmp/infra
+
+          DEPLOYMENT="k3s/apps/tapir/deployment.yaml"
+          # In-place update of the image tag. sed (not yq) so we don't
+          # depend on additional tooling on the runner — same as cobalt-dingo.
+          sed -i "s|image: localhost:5000/tapir:.*|image: localhost:5000/tapir:${IMAGE_TAG}|" "$DEPLOYMENT"
+
+          # Verify the patch took effect.
+          grep -q "localhost:5000/tapir:${IMAGE_TAG}" "$DEPLOYMENT" \
+            || { echo "✗ image tag patch failed"; exit 1; }
+
+          if git diff --quiet "$DEPLOYMENT"; then
+            echo "ℹ image tag unchanged — skipping push"
+          else
+            git -c user.name="tapir CI" \
+                -c user.email="ci@tapir.local" \
+                commit -m "chore(deploy): tapir → ${IMAGE_TAG}" "$DEPLOYMENT"
+            git push origin main
+            echo "✓ pushed to infra repo"
+          fi
+
+          shred -u ~/.ssh/id_infra
+
+      - name: Trigger Flux reconcile (immediate)
+        run: |
+          # Without these annotations, Flux would still pick up the change
+          # within 30s (the apps Kustomization interval). The annotations
+          # cut latency to ~1s.
+          kubectl -n flux-system annotate gitrepository flux-system \
+            reconcile.fluxcd.io/requestedAt="$(date +%s)" --overwrite
+          kubectl -n flux-system annotate kustomization apps \
+            reconcile.fluxcd.io/requestedAt="$(date +%s)" --overwrite
+
+      - name: Wait for Flux to apply new image
+        env:
+          IMAGE_TAG: ${{ needs.build.outputs.image-tag }}
+        run: |
+          # Poll the Deployment spec until it reflects the new tag.
+          # Bound to 60s so a stuck Flux doesn't hang CI.
+          EXPECTED="localhost:5000/tapir:${IMAGE_TAG}"
+          for i in $(seq 1 60); do
+            CURRENT=$(kubectl get deploy tapir -n tapir \
+              -o jsonpath='{.spec.template.spec.containers[0].image}' 2>/dev/null || echo "")
+            if [ "$CURRENT" = "$EXPECTED" ]; then
+              echo "✓ Flux applied new image after ${i}s"
+              break
+            fi
+            sleep 1
+          done
+          # Final assertion (in case the loop exited without matching).
+          kubectl get deploy tapir -n tapir \
+            -o jsonpath='{.spec.template.spec.containers[0].image}' \
+            | grep -qx "$EXPECTED" \
+            || { echo "✗ Flux did not apply new image within 60s"; exit 1; }
+
+      - name: Verify rollout
+        run: |
+          kubectl rollout status deployment/tapir \
+            --namespace tapir \
+            --timeout=120s \
+          || {
+            echo "── pod status ──"
+            kubectl get pods -n tapir -o wide
+            echo "── events ──"
+            kubectl get events -n tapir --sort-by='.lastTimestamp' | tail -20
+            echo "── describe ──"
+            kubectl describe pods -n tapir -l app=tapir | tail -40
+            exit 1
+          }
+
+      - name: Confirm pod running new image
+        env:
+          IMAGE_TAG: ${{ needs.build.outputs.image-tag }}
+        run: |
+          kubectl get pods -n tapir \
+            -l app=tapir \
+            --field-selector=status.phase=Running \
+            -o jsonpath='{.items[*].spec.containers[0].image}' \
+          | grep -q "localhost:5000/tapir:${IMAGE_TAG}" \
+          && echo "✓ pod running new image" \
+          || { echo "✗ pod image mismatch"; exit 1; }
+
+  # ── 4. Mirror to GitHub — skipped for now (SSH key rotation pending) ─

.gitignore

@@ -11,3 +11,14 @@
 .env.*
 !.env.example
 *.local
+
+# Spike media (#28): real recordings, their transcripts and derived analyses are
+# private third-party content and this repo is public. Only synthetic fixtures
+# are committed — see scripts/spike-media/README.md.
+/scripts/spike-media/*.mov
+/scripts/spike-media/*.mp4
+/scripts/spike-media/*.wav
+/scripts/spike-media/*.srt
+/scripts/spike-media/*.json
+/scripts/spike-media/*.html
+!/scripts/spike-media/fixtures/

.mcp.json

@@ -0,0 +1,18 @@
+{
+  "mcpServers": {
+    "brain": {
+      "type": "http",
+      "url": "https://brain-mcp.d-ma.be/mcp",
+      "headers": {
+        "Authorization": "Bearer ${BRAIN_MCP_TOKEN}"
+      }
+    },
+    "gitea": {
+      "type": "http",
+      "url": "https://git-mcp.d-ma.be/mcp",
+      "headers": {
+        "Authorization": "Bearer ${GITEA_MCP_TOKEN}"
+      }
+    }
+  }
+}

CLAUDE.md

@@ -12,6 +12,7 @@ docs it indexes.
 3. `DECISIONS.md` — the ADRs. Decisions are settled here; do not re-litigate without a new ADR.
 4. `docs/architecture/architecture.md`, `docs/data-model.md`, `docs/use-cases/*.feature`.
 5. `docs/homelab-integration.md` — the concrete endpoints/conventions you'll need.
+6. `LANGUAGE.md` — the project vocabulary. Apply the caveman rubric before destructive operations.
 
 ## How to work in this repo
 
@@ -46,8 +47,9 @@ These caused real mistakes that were caught and corrected; the corrections are l
 (See `DECISIONS.md` for full rationale. Listed here so you don't propose them.)
 
 - **No Supabase** — reuse Dex / ESO+1Password / Postgres (ADR-002).
-- **No global cross-tenant video/transcript table** — per-user isolation (data-model). Dedup
-  across users is a Future C concern, not a Stage 0/1 default.
+- **No global cross-tenant *video* table** — videos stay per-user (data-model). Transcripts ARE
+  shared since ADR-021 (public caption content, keyed by `(provider, provider_video_id)`, non-RLS)
+  so re-analysis never re-fetches; the *videos* half of cross-tenant dedup stays a Future C concern.
 - **No audio-download + speech-to-text in the core path** — captions-first (ADR-007). STT is a
   deferred, bounded optional component.
 - **No public SaaS / sign-up / billing / Google OAuth verification at scale** — Future C,
@@ -85,7 +87,7 @@ Skills live in the canonical library `mathias/skills` and are wired into this re
 
 ## Current build state (start here for the first task)
 
-The repo is **green and shipping** — last tag `v0.9.0`. `task check` passes (fmt, vet, lint,
+The repo is **green and shipping** — last tag `v0.15.0`. `task check` passes (fmt, vet, lint,
 `go test -p 1 ./...`). Go is `1.26.1` (see `go.mod`).
 
 - Clean Architecture core is implemented: `internal/domain` (entities), `internal/ports`
@@ -94,13 +96,19 @@ The repo is **green and shipping** — last tag `v0.9.0`. `task check` passes (f
   green against it.
 - Adapters present under `internal/adapters/`: `youtube` (captions-first `VideoSource`,
   timedtext/InnerTube acquisition per ADR-010), `summarizer` + `llm` (the copied AI router,
-  Primary→Fallback per ADR-004), `store` (Postgres, golang-migrate migrations 001–006),
+  now a resilient endpoint chain — local primary → local fallback → external worst-case,
+  parse-failure-aware, ADR-004 + ADR-022), `store` (Postgres, golang-migrate migrations 001–015),
   `secrets` (file-backed `SecretStore`). The brain HTTP sink (ADR-005) is the remaining
   optional sink.
 - Stage 1 is open (ADR-012): multi-user with **DB-enforced** isolation — Postgres RLS `FORCE`d
   on all user-owned tables (migration 003), two-user isolation test in
   `internal/adapters/store/rls_test.go`. Registration gate, per-user YouTube web connect, and
   account management (disconnect / delete, ADR-013) all shipped.
+- Transcript persistence (ADR-021, migration 015): transcripts are a **shared, non-RLS** store
+  keyed by `(provider, provider_video_id)` — the single exception to the isolation boundary
+  (`TestTranscriptsTableIsSharedNotRLS`). The engine reads stored transcripts before any caption
+  fetch (`usecase.resolveTranscript`), so re-analysis — re-summarize, paste-a-URL, onboarding
+  burst — never re-touches YouTube. Per-user summaries/videos stay RLS-scoped.
 - `cmd/tapir` subcommands: `list`, `show`, `auth` (interactive host-side OAuth), `run` (batch
   watch→summarize), `serve` (the HTMX+Templ web reader/writer under `internal/web`, a new
   transport over the unchanged engine/ports — ADR-003). `tapir env` prints config.

DECISIONS.md

@@ -743,6 +743,577 @@ collapse keys off the same window (`App.RecencyWindow=0` → everything inline).
 
 ---
 
+## ADR-021 — Persist transcripts as shared, video-keyed public content (re-analysis never re-fetches)
+
+**Status:** Accepted (2026-06-09). **Reopens the transcripts half of** the "Global cross-tenant
+`videos`/`transcripts` table" rejection (data-model.md). **Builds on ADR-007** (captions-first),
+**ADR-010/ADR-014** (the per-IP caption rate gate), and **ADR-012** (per-user RLS isolation).
+
+**Context.** Every summarization fetches the transcript fresh through the caption path, even when
+the exact same transcript was fetched moments ago — for the same user re-summarizing, or for a
+second user who happens to watch the same video. The caption fetch is the one genuinely scarce,
+genuinely risky operation in the system: YouTube's timedtext endpoint is unofficial and per-IP
+rate-limited (ADR-010), and tripping it risks the maintainer's Google standing (ADR-014). So the
+operation we most want to *avoid repeating* is the one we currently repeat unconditionally. A
+transcript is **public content** — the same words YouTube serves to anyone — and carries nothing
+user-identifying. The per-user isolation that protects summaries, feeds, and tokens (ADR-012) is
+the wrong shape for it: it forces a re-fetch per user for data that is identical across users.
+
+The original rejection ("Global cross-tenant `videos`/`transcripts` table") bundled videos and
+transcripts together and rejected both on the grounds that "at 1–5 users, re-summarizing is
+cheaper than the coupling." That reasoning holds for **videos** (per-user feed rows, genuinely
+user-scoped) but not for **transcripts**: the cost being avoided is not LLM re-summarization, it
+is a *rate-gated, reputation-risky network fetch*, and that cost is paid per re-fetch regardless
+of user count. One re-fetch avoided is strictly worth more than the coupling it removes.
+
+**Decision.**
+1. **A single shared `transcripts` table, keyed by the cross-user dedup key
+   `(provider, provider_video_id)`** — the stable public identity of the video, not Tapir's
+   internal per-user `videos.id`. Columns: the key, `source` (`captions`/`none`), `language`,
+   `content`, `fetched_at`. It holds **only public caption content + the video's public id** —
+   nothing user-identifying — and is therefore **NOT RLS-scoped**: no `user_id`, no policy, no
+   `FORCE ROW LEVEL SECURITY`. This is the deliberate, single exception to the ADR-012 isolation
+   boundary, and the only one.
+2. **Summarize path becomes read-stored-first.** Have a stored transcript for this video? →
+   summarize from the stored text, **no caption fetch**. No stored transcript? → fetch *through
+   the unchanged gate* (ADR-014) → store it → summarize. The gate is neither bypassed nor
+   weakened; persistence reduces how *often* we reach it, never how *fast*.
+3. **De-facto cross-user dedup is the intended behaviour, not a feature with a switch.** Two
+   users who share a video share the one transcript row. A permanent `source = 'none'` (no
+   captions) is stored too, so a known-caption-less video is not re-fetched by anyone. A
+   transient 429 (`SourceRateLimited`) is **never** stored as terminal — it stays a per-user
+   retry via the existing `transcript_status` backoff (ADR-014), so persistence cannot mask a
+   rate-limit into a false "no transcript."
+4. **Per-user `summaries` stay RLS-scoped (ADR-012 unchanged)** and reference the transcript by
+   video id. Videos stay per-user. Only transcripts go shared.
+
+**Consequences.** Re-analysis (re-summarize, different model, paste of an already-seen video,
+onboarding of a second user with overlapping subscriptions) never re-touches YouTube — the
+primary win, and it *reduces* aggregate caption-gate pressure, reinforcing ADR-010/ADR-014 rather
+than straining them. The isolation surface gains exactly one non-RLS table; an isolation test
+asserts the boundary is *exactly* there and has not leaked to any user-owned table (this is the
+proof the public-content classification was implemented as designed). It also unblocks
+multi-model / customizable analysis (re-run analysis on stored text for free) — enabling that is
+this ADR's point; building it is separate.
+
+**Reversibility.** The read-stored-first check is the only behavioural coupling; removing it
+restores fetch-every-time. The down-migration recreates the per-user RLS-scoped transcripts shape
+(001/003). No user-facing surface depends on cross-user sharing — sharing is the *storage shape*,
+never exposed in the UI.
+
+---
+
+## ADR-022 — Summarizer is a resilient endpoint chain, not a single model
+
+**Status:** Accepted (2026-06-10). **Extends ADR-004** (the copied `llm` Primary→Fallback
+routing). Triggered by the first friendly-pilot live run, where a connected user got **zero**
+summaries after 12h.
+
+**Context.** Stage-0 ran a single summarizer model (`koala/phi4-mini`) with no fallback wired
+(`summarizer.New(primary, nil)`). The live run exposed three independent failure modes, each of
+which silently produced no summary:
+
+1. **Context overflow.** `phi4-mini` has an 8k context. Real transcripts (one was 11,602 tokens)
+   exceed it and the gateway returns HTTP 400 — and the request also sent `max_tokens=8192`, so
+   even a short transcript plus the completion budget could overflow the window.
+2. **Malformed model output.** `phi4-mini` intermittently emits `highlights` as a bare string
+   instead of an array, producing `cannot unmarshal string into []string`. The old code returned
+   the parse error **without** trying any other model — a 200-with-bad-JSON short-circuited.
+3. **No fallback existed at all** — any primary failure was terminal for that video.
+
+`phi4-mini` is kept as primary deliberately: it is fast and, on transcripts that fit, correct.
+The fix is resilience around it, not replacing it.
+
+**Decision.**
+1. **Ordered endpoint chain (`summarizer.NewChain`).** Endpoints are tried in order; the first to
+   return a *parseable* summary wins. Default chain:
+   `koala/phi4-mini` (primary, local) → `iguana/gemma4-26b` (fallback, local on a
+   *different host*) → `berget/mistral-small` (worst-case, external). All three are reached through
+   the **one** LiteLLM gateway by alias — the gateway already fronts both llama-swap and berget — so
+   a fallback is a different alias, not a second client config.
+
+   **Update 2026-06-11:** the local fallback moved from `koala/phi4-14b` to `iguana/gemma4-26b`.
+   koala now carries other GPU loads, so keeping the fallback on koala competed with them; iguana
+   (M2 Ultra) has the headroom, and a different host is also a different egress IP for the rare
+   fallback fetch. `gemma4-26b` is the brain-validated homelab general-purpose model (agentsquad
+   H2/H3 executor) and returned valid summary JSON on the real prompt in a smoke test
+   (~37s incl. cold-load — fine for a path hit only when the fast primary fails). Pure config:
+   `TAPIR_FALLBACK_MODEL`.
+2. **A parse failure advances the chain, same as a transport error.** "Reliably summarized" means
+   *parseable summary returned*, not *HTTP 200*. This is the behaviour the old Primary→Fallback
+   shape missed.
+3. **Tolerant parse.** `highlights`/`takeaways` coerce from a bare string (or a mixed scalar
+   array) to `[]string`, so the most common small-model quirk is absorbed **without** spending a
+   fallback round-trip — keeping the fast path fast.
+4. **Transcript truncation (`TAPIR_MAX_TRANSCRIPT_CHARS`, default 18000).** Input is bounded
+   up-front to fit a small-context primary, so overflow is prevented rather than recovered-from.
+5. **Bounded completion budget (`TAPIR_SUMMARY_MAX_TOKENS`, default 1500).** A summary needs few
+   hundred tokens; the old 8192 budget itself contributed to 8k-window overflow.
+
+**Local-first guarantee preserved.** The chain ordering *is* the guarantee: locals are tried
+first, so content reaches the external endpoint only after every local endpoint has failed.
+`TAPIR_CLOUD_FALLBACK_MODEL=""` removes the external endpoint entirely — the lever a
+**client/NDA deployment** pulls so content never leaves the local stack. With no external endpoint
+configured the `ai_routing.feature` "content only local" scenarios hold unchanged.
+
+**Reversibility.** Pure wiring + config. Setting `TAPIR_FALLBACK_MODEL` and
+`TAPIR_CLOUD_FALLBACK_MODEL` empty collapses the chain back to single-primary behaviour; the
+tolerant parse and truncation are strict supersets of the old behaviour (a previously-parseable
+reply still parses; a transcript within budget is unchanged).
+
+---
+
+## ADR-023 — Drop Shorts/livestreams at discovery to protect the caption budget
+
+**Status:** Accepted (2026-06-10). **Builds on ADR-014** (per-IP caption rate limit is the
+binding constraint) and the ADR-022 live-run findings.
+
+**Context.** The scarce resource is the unofficial timedtext caption fetch (per-egress-IP
+429, ~3 successful/pass). The first multi-user run showed the candidate set was mostly noise —
+Shorts, sub-minute clips, and live broadcasts — each of which still consumes a caption-fetch
+attempt (and a "none" result is a *completed* fetch, so it costs budget even when it yields
+nothing). Spending the rate-limited budget on content the user will not read is the waste to
+cut first; it is cheaper and lower-risk than raising the ceiling (multi-IP, Whisper).
+
+Duration and live status are NOT in the playlistItems discovery response, but they ARE in the
+Data API `videos.list` (contentDetails.duration + snippet.liveBroadcastContent) — the official
+**quota-based** API (1 unit/call, 50 ids/call), which is a *different* limit from the timedtext
+429. So one cheap quota call buys a filter that saves many expensive throttled fetches.
+
+**Decision.**
+1. `NewVideos` enriches its candidates with a single `videos.list` call and drops, before
+   returning: videos shorter than `TAPIR_MIN_VIDEO_SECONDS` (default 60) and any `live`/
+   `upcoming` broadcast. Dropped videos are never persisted, so they also declutter the list.
+2. The filter is **degrade-open**: `MinVideoSeconds=0` disables it (no quota call), and a
+   `videos.list` error returns the candidates unfiltered — discovery must never break because a
+   metadata call hiccuped (worst case = pre-ADR-023 behaviour).
+3. The paste-a-URL path (`VideoByID`) is **not** filtered — an explicit user request for a
+   specific video (even a Short) is honoured.
+
+**Reversibility.** Pure discovery-time filter + config. `TAPIR_MIN_VIDEO_SECONDS=0` restores
+the old behaviour. No schema change, no effect on already-stored videos.
+
+**Quota note.** Per-channel enrichment adds ~1 unit/channel/pass. At pilot scale (≤3 users)
+this is well under the 10k/day cap; at larger scale, batch `videos.list` across channels
+(50 ids/call) by collecting all discovered ids per pass before enriching.
+
+---
+
+## ADR-024 — Per-channel caption-availability memory
+
+**Status:** Accepted (2026-06-10). **Builds on ADR-014** (per-IP caption budget), **ADR-021**
+(shared transcript cache), **ADR-023** (Shorts filter).
+
+**Context.** After ADR-021 caches transcripts and ADR-023 drops Shorts, the remaining caption
+waste is the *first* fetch on every new video of a channel that never publishes English captions
+(foreign-language news, music, etc.). Each costs one rate-limited fetch to resolve to "none" —
+and on a throttled IP that fetch may 429 and churn the backoff machinery before it ever gets a
+verdict. A pilot user's feed had several such channels.
+
+**Decision.** Remember, per `(user, channel)`, a streak of consecutive no-caption outcomes
+(`channel_caption_state`, migration 016, RLS-scoped like the rest of the user-owned schema).
+Once the streak reaches `TAPIR_CHANNEL_CAPTIONLESS_THRESHOLD` (default 5) the channel is
+suppressed — its videos are discovered/listed but not caption-fetched — for
+`TAPIR_CHANNEL_CAPTIONLESS_WINDOW` (default 14d), after which one video is re-probed
+(auto-recovery for a channel that starts adding captions). A successful fetch resets the streak;
+a fresh 429 does NOT count (transient, not a caption verdict). An explicit manual request
+bypasses suppression. `threshold = 0` disables the feature.
+
+**Why per-user, not global.** Caption availability is really a channel property (public), so a
+global table would let users share the learning. But subscriptions are per-user (ADR-012) and at
+pilot scale users' channel sets barely overlap, so per-user + RLS keeps it consistent with the
+existing isolation model with no new non-RLS exception to justify. Promoting to a shared table
+(like transcripts, ADR-021) is a future optimisation if channel overlap grows.
+
+**Reversibility.** Migration 016 is a clean drop; `threshold = 0` disables at runtime. The
+memory only ever *suppresses fetches* — it never deletes content or affects already-stored
+summaries.
+
+---
+
+## ADR-025 — Honest, state-aware foreground summarization status
+
+**Status:** Accepted (2026-06-10). **Pillar B of the manual-mode UX work** (Pillar A, foreground
+fetch priority, is a separate follow-up). Builds on ADR-014 (the rate limit the UX must make
+legible).
+
+**Context.** Clicking "Summarize" spawned a background goroutine and polled `/status`, which
+returned only two states: the spinner (in-flight) or the normal card (done). But the web
+`ProcessVideo` only recorded an outcome on *success* — a 429'd or caption-less click left
+`transcript_status` unset, so the next poll silently reverted to the "Summarize" button. The
+user saw either an endless spinner or a button that did nothing useful when clicked again. The
+binding constraint (YouTube's caption rate limit) was completely invisible.
+
+**Decision.**
+1. **Record every outcome on the web path**, mirroring the runner: `ProcessVideo` stamps
+   `rate_limited` / `none` / `fetched`. A rate-limited video keeps its requested flag so the
+   background sweep retries it; `none` and `fetched` are terminal.
+2. **`/status` is state-aware**: summarized → summary card; in-flight → working spinner;
+   `rate_limited` → a calm "waiting, will retry" card that keeps polling (every 30s) so the
+   summary appears on its own when the retry lands — the user never clicks again;
+   `none` → a terminal "no captions" card with no poll and no dead-end button.
+3. **Charm status text** (Claude-Code / Crush inspired): the working spinner cycles playful,
+   tapir-themed gerunds ("Chewing the cud…", "Munching leaves…", "Distilling the gist…") via
+   CSS only — no JS, keeping the HTMX/no-JS ethos. Decorative (aria-hidden) with a stable
+   `role=status` line for assistive tech.
+
+**Principle.** When the system cannot be fast (throttled IP), it is at least honest, and it
+self-resolves without making the user retry. Honesty is the load-bearing half — Pillar A's
+priority lane only improves the odds of a fast slot; it cannot beat an already-hot IP.
+
+**Reversibility.** Pure transport-layer + view change over the unchanged engine/ports. No
+schema change (reuses `transcript_status` from migration 007).
+
+---
+
+## ADR-026 — Foreground caption fetches take priority; the credentials probe is dead
+
+**Status:** Accepted (2026-06-10). **Pillar A of the manual-mode UX work** (Pillar B was
+ADR-025). Builds on ADR-014 (the shared per-IP gate).
+
+**Context.** Every caption fetch — the background sweep and the web click-path — shared one
+process-wide rate gate equally. So a user waiting on a "Summarize" click competed with the
+firehose for both pacing and the scarce pre-429 window; on a busy IP the click was slow or
+429'd while the background churned.
+
+**Decision.** A context-marked priority lane. The web path
+(`engineProcessor.ProcessVideo`) wraps its context with `ForegroundContext`; the gate gives
+foreground fetches a token immediately, while **background fetches yield** — they wait until no
+foreground fetch is pending before taking a token. Threaded via a context value (not new
+signatures) and a process-wide `foregroundPending` counter. Clicks are rare and bursty, so the
+background barely loses throughput; the waiting human gets the next (and cleanest) slot.
+
+**Credentials probe — rejected, not built.** The idea was to fetch captions with the user's
+auth in manual mode to dodge 429s. It is a dead end, already settled by ADR-010 and the code:
+the caption path is *deliberately anonymous* because the InnerTube/timedtext endpoints **reject
+or break on authenticated requests** (`captions.go`: "no OAuth token — it can break the
+timedtext endpoint"). The user's OAuth (a Data API credential) does not authenticate InnerTube
+at all, and the official `captions.download` is owner-only (403 on third-party). So auth cannot
+help here and can actively hurt. No probe needed — building one would only re-confirm the ADR.
+
+**Reversibility.** Context-marker + a yield loop in the gate; removing the marker collapses to
+the prior equal-share behaviour. No schema or API change.
+
+---
+
+## ADR-027 — Chat with a video's stored transcript (deeper-dive, on an already-summarized video)
+
+**Status:** Accepted (2026-06-11). **Consumes ADR-021** (the shared, video-keyed transcript
+store) for the first time beyond summarization; **uses the ADR-022 chain models**; relates to
+ADR-012 (isolation) and ADR-016 (the Stage-0 gate).
+
+**Context — observed demand, not hypothetical.** The maintainer read 10+ real pilot summaries
+and reported the reactions: *many good; some he wanted to dig deeper into; some less useful*
+(the "less useful" split between weak-*model* output and uninteresting-*video* content). The
+middle reaction is the signal: a good summary that makes the reader want *more* is the summary
+succeeding at triage and then hitting a wall — there is nowhere to go deeper short of watching
+the video. That want is the feature. It is also the cheapest possible feature to satisfy
+honestly, because ADR-021 already persists the transcript: the deeper-dive runs entirely on
+stored public-content text + local models, touching **no** caption fetch and **no** YouTube.
+
+**Decision.** Add a per-video chat that lets the user ask questions against a video's stored
+transcript.
+1. **Entry from the summary view only.** A "dig deeper / ask" affordance on a summarized video —
+   the chat lives exactly where the "I want more" reaction happens. No standalone chat surface.
+2. **Stored-transcript-only (load-bearing constraint).** Chat is available **only** for videos
+   that already have a stored transcript. It never triggers a caption fetch, so it cannot touch
+   the rate gate, the 429 surface, or YouTube at all — the entire account-safety constraint that
+   governs the rest of Tapir is satisfied *by construction* here, not by careful gating. (Entry
+   being "from a summary" guarantees the transcript exists.) On-demand fetch for un-stored videos
+   is explicitly deferred.
+3. **Model = the summary's model by default; user-switchable among the ADR-022 chain models**
+   (`phi4-mini` / `gemma4-26b` / `mistral-small` to start). This is deliberate: it doubles as
+   live model-comparison instrumentation — ask the same question of the same transcript under two
+   models and the difference is directly felt. This is the mechanism by which the maintainer
+   learns *which* model is worth defaulting to, and it is the multi-model-analysis direction
+   ADR-021 anticipated, arriving as a user-facing capability.
+   - Chat is a **read-bounded retrieval/QA task** (the user supplies the focus), which is
+     *easier* than summarization (the model must decide what matters). So a model that summarizes
+     mediocrely may chat well — chat is plausibly a partial remedy for the weak-summary case, not
+     an inheritor of it.
+4. **Ephemeral chat (v1).** No persisted history; chat is per-session. Persisting per-user,
+   RLS-scoped history is deferred until there is evidence anyone wants to revisit a conversation.
+5. **Chat-only, trust-the-model (v1) — with a recorded limitation.** The chat does not expose the
+   raw transcript for verification in v1 (kept simple). **Known limitation:** because some
+   summaries were weak-model output, the user has reason not to fully trust a chat answer's
+   fidelity to the transcript, and v1 gives no in-UI way to check. The model-switcher partially
+   compensates (two models disagreeing on the same question is itself a signal). A
+   "show source / view transcript" verification path is the natural **v2** and is *not*
+   foreclosed — ADR-021's stored transcript already makes it cheap. Recorded so v2 is a known
+   next step, not a rediscovery.
+
+**Why this is safe and in-scope.** It adds no caption-fetch surface (stored-only), no new
+non-RLS table (transcripts already shared per ADR-021; ephemeral chat stores nothing), and no
+auth change. It is additive to the read path. The one genuine product expansion — Tapir becomes
+an interactive transcript-QA tool, not only a summarizer — is justified by *observed* demand from
+real reading, which is exactly the kind of evidence the Stage-0 discipline asks for before
+building.
+
+**Relation to the Stage-0 gate.** This is **not** a return-nudge (those stay deferred, ADR-020) —
+it adds nothing that prompts the user to return; it deepens the value *once they are already
+reading*. It does not contaminate the unprompted-return signal. If anything it strengthens the
+"useful to me" case the gate measures, by giving a good summary somewhere to lead.
+
+**Reversibility.** Additive read-path feature over the unchanged engine + the ADR-021 store.
+Removing the summary-view affordance removes the feature; nothing else depends on it. Ephemeral =
+no migration, no stored state to unwind. Spec: `docs/specs/chat-with-transcript.md`.
+
+---
+
+## ADR-028 — Onboarding burst: pick likely-good videos, summarize them with a stronger model
+
+**Status:** Accepted (2026-06-11). **Refines ADR-018** (the connect-time burst) and **ADR-020**
+(recency-bounded auto-summarize). **Builds on ADR-022** (the endpoint chain), **ADR-023**
+(the discovery-time `videos.list` enrichment), and **ADR-021** (the shared transcript cache).
+Triggered by a Phase-1 investigation of the live pilot DB.
+
+**Context.** A new user's first session decides whether they return (the Stage-0 gate, ADR-016).
+The connect-time burst (ADR-018: summarize ≤`TAPIR_ONBOARD_SUMMARIZE_COUNT` newest videos so the
+feed isn't empty) *fires* in production, but a live-DB investigation of the second pilot user
+("Jonte") found it delivers a weak first impression for two reasons, and ruled out a third idea:
+
+1. **Junk picks.** Selection was pure newest-first (`NewestUnsummarizedVideoIDs`,
+   `ORDER BY published_at DESC`) with **no quality signal**. Jonte's live burst-3 were a
+   stock-ticker **livestream** + two regional news clips — newest, not best. The cheap signals
+   that *could* gate this (duration, live status) are fetched by ADR-023's `videos.list`
+   enrichment at discovery and then **thrown away**: the `videos.duration_s` column (migration
+   001) was never written.
+2. **Weakest model on the first impression.** All burst summaries ran on `koala/phi4-mini` — the
+   documented weak link (ADR-022 was born from its failures). The stronger, brain-validated
+   `iguana/gemma4-26b` was never used, even though the burst is only ~3 summaries.
+3. **Cached-first instant summaries — REJECTED.** The idea: skip the fetch, summarize
+   already-cached transcripts (ADR-021) instantly. The pilot numbers kill it — only **11 videos**
+   overlap between the two users (~3% of each ~350–400-video library), **0** cached-and-
+   unsummarized, and a new user's newest-20 unsummarized are **20/20 NOT cached**. Newest-first
+   and cached-first are structurally incompatible: fresh uploads are exactly what nobody has
+   fetched. An empty lever at pilot scale.
+
+**Decision.**
+1. **Persist `duration_s` at discovery.** `filterLowValue` (ADR-023) already has each candidate's
+   duration in hand; carry it onto the kept `domain.Video` and have `UpsertVideo` write it,
+   COALESCE-preserving a known value (the channel-title backfill stance, migration 014). No new
+   migration — the column exists. The connect-triggered discovery pass runs *before* the burst,
+   so a fresh user's candidates are enriched in time.
+2. **Junk-avoiding selection.** A new `OnboardBurstVideoIDs(userID, limit, minSeconds, maxSeconds)`
+   keeps the newest-first order but drops a video when its duration is *known* and outside
+   `[minSeconds, maxSeconds]` — `minSeconds` = `TAPIR_MIN_VIDEO_SECONDS` (60, the Shorts floor),
+   `maxSeconds` = new `TAPIR_ONBOARD_MAX_VIDEO_SECONDS` (default 14400 = 4h, to drop multi-hour
+   livestream VODs that pass the live filter once ended). A NULL duration is **unknown** — kept
+   (degrade-open) but ranked after known-good rows. **has-captions stays un-gateable pre-fetch**
+   (only knowable after a gate fetch or a ~0-probability cache hit); selection only *avoids
+   known-junk*, it does not *promise* captions.
+3. **Stronger model for the burst only.** `TAPIR_ONBOARD_SUMMARIZER_MODEL` (default
+   `iguana/gemma4-26b`) leads a burst-specific summarizer chain (onboard model first, then the
+   standard ADR-022 chain as resilience, deduped), wrapped in a burst-specific processor over the
+   *same* store/cache/sink — a pure wiring choice; the engine and ports are unchanged (ADR-003).
+   Empty or equal-to-primary collapses the burst back onto the shared processor.
+
+**Not a throughput change.** The caption rate gate (ADR-014) and the foreground priority lane
+(ADR-026) are untouched — same pacing, same cap. This changes *which* ≤3 videos the burst spends
+its fetches on and *which model* summarizes them, never how fast or how many. The engine's
+existing read-stored-first (ADR-021) is unchanged and still yields a free instant summary on the
+rare cache hit — we simply do not *select* for cache hits.
+
+**Consequences.** Better odds of a strong first session: the burst avoids the obvious junk and
+runs the better model on the one impression that decides return. The selection improvement is
+forward-looking — existing rows have NULL `duration_s` until their next discovery pass backfills
+it (lazy, like channel_title); a brand-new user benefits immediately because connect-discovery
+runs first. `duration_s` becoming live also unblocks future length-aware features (feed sorting,
+"long read" badges) for free.
+
+**Reversibility.** Pure config + wiring + one column write + one query, no migration.
+`TAPIR_ONBOARD_MAX_VIDEO_SECONDS=0` (and `TAPIR_MIN_VIDEO_SECONDS=0`) restores pure newest-first;
+`TAPIR_ONBOARD_SUMMARIZER_MODEL=""` collapses the burst back to the shared processor.
+Spec: `docs/specs/onboarding-wow-burst.md`.
+
+---
+
+## ADR-029 — Stateless session cookie (survives restarts, browser-close, idle)
+
+**Status:** Accepted (2026-06-11). Triggered by pilot feedback: "lots of clicking to log in again
+on iPhone." Supersedes the in-memory session store in the ADR-011 login.
+
+**Context.** Three compounding causes made users re-login constantly:
+1. **In-memory session store** (`sessionStore` map) — wiped on every pod restart, so each deploy
+   logged everyone out. During the active build period that was ~15 logouts.
+2. **1-hour session TTL** — for a "check back tomorrow" reader, idle > 1h forced a re-login on
+   nearly every visit.
+3. **No cookie Max-Age** — a session cookie (deleted on browser/app close); iPhone Safari closing
+   the tab dropped it.
+Each re-login is the full Dex/Authentik redirect dance — many taps on mobile.
+
+**Decision.** Make the session **stateless**: the identity (subject + email) and an absolute
+expiry live INSIDE the existing HMAC-signed (HS256) cookie — no server-side table. Plus:
+- **30-day sliding TTL** (was 1h), re-signed on each request so an active user never lapses.
+- **Persistent cookie** (`Max-Age` set) so it survives browser/app close.
+The cookie is HttpOnly + Secure + SameSite=Lax; the HMAC (keyed by the stable ESO
+`tapir-session-secret`, which does NOT rotate per deploy) makes it tamper-proof. The payload is
+identity, not secrets — the OIDC access/ID tokens are still discarded after callback.
+
+**Consequences.** A deploy/restart no longer logs anyone out (proven by a test: a cookie issued by
+one instance is accepted by a fresh instance with the same secret); works across replicas for
+free. **Trade:** no server-side revocation — `logout` clears the cookie client-side, but a copied
+cookie stays valid until expiry. Accepted for the Stage-0 reader pilot; revisit (server-side
+revocation list, or shorter TTL + refresh) if it ever holds sensitive actions. Rotating
+`tapir-session-secret` invalidates all sessions — the global logout lever.
+
+**Not addressed here:** the tap-count of the IdP login page itself is Authentik's UX; with
+re-login now rare (30-day idle or explicit logout), it matters far less.
+
+---
+
+## ADR-030 — Observability: slog timing + Prometheus metrics (AI-focused)
+
+**Status:** Proposed (2026-06-11). Issue #15. **Draft for review — no code yet.**
+
+**Context / requirements.** Nothing measures the activities that drive Tapir's performance and
+UX, and the Stage-0 eval gate (ADR-016) needs a *performance* dimension to sit beside the
+return-usage one. We need timing for: caption fetches (the scarce op), summarization (which model
+won, how long, fallbacks), Q&A latency, LLM token spend, and basic session/usage (request rate,
+latency by route, logins). Requirements:
+- R1: structured `slog` timing at each AI call site (human-readable, already the logging stack).
+- R2: Prometheus metrics for the same, scrapeable by the cluster's prometheus-operator.
+- R3: **AI metrics are the priority** — summarize latency by `model`/`outcome`/`fallback`,
+  caption-fetch latency by `outcome`, chat latency by `model`, and LLM `tokens` by model+kind.
+- R4: HTTP/session metrics via middleware — request count + latency by route, logins.
+- R5: bounded label cardinality (no per-user, no raw-path labels).
+- R6: `/metrics` must NOT be publicly exposed.
+
+**Decision / architecture.**
+1. **New package `internal/metrics`** owns all Prometheus collectors + a typed API
+   (`ObserveSummarize`, `ObserveCaptionFetch`, `ObserveChat`, `RecordTokens`, `IncLogin`,
+   `HTTPMiddleware`, `Handler`). Adapters call this API; they never import prometheus types.
+2. **New dependency `github.com/prometheus/client_golang`.** Justification: it is *the* standard
+   Go Prometheus client and the cluster already runs prometheus-operator; hand-rolling exposition
+   is not worth it. (Needs the dep-justification note in the commit per repo rules.)
+3. **The copied `llm` package stays stdlib-only (ADR-004).** It must not import `internal/metrics`.
+   Token usage is surfaced via an **optional callback** `llm.WithUsageHook(func(model string, prompt, completion int))`
+   set at wiring time (`buildSummarizer`/`buildChat`) to `metrics.RecordTokens`; `llm.Client` only
+   gains parsing of the response `usage` block. Our own adapters (`summarizer`, `youtube`, `chat`)
+   may import `internal/metrics` directly.
+4. **HTTP middleware** reads `r.Pattern` AFTER routing (Go 1.22 sets it during ServeMux match), so
+   the `route` label is the bounded registered pattern (`GET /v/{videoId}`), satisfying R5;
+   unmatched → `other`.
+5. **Dedicated metrics port** (`TAPIR_METRICS_ADDR`, default `:9090`) served by a second
+   `http.Server` in `cmdServe`; `/metrics` is never on the public app mux (R6). A **PodMonitor**
+   in `mathias/infra` scrapes it; the deployment exposes the port.
+6. **slog** elapsed fields are emitted alongside each metric at the call sites (R1).
+
+**Hook points (where the instrumentation lands).**
+- `summarizer.Summarize` — per-endpoint timing + outcome (`success`/`parse_error`/`error`) + fallback flag.
+- `youtube.FetchTranscript` — fetch timing + outcome from `domain.Transcript.Source`.
+- `chat.Service` answer — timing by model.
+- `llm.Client.Complete` — parse `usage`, fire the usage hook.
+- `oidc.handleCallback` — `IncLogin`.
+- `cmdServe` — wrap `Router()` in `metrics.HTTPMiddleware`; start the metrics server.
+
+**Out of scope / later.** Persisting per-summary latency into Postgres for `tapir report`
+(derive UX latency — publish/discovery → summary — from existing timestamps first; only persist
+op-latency if the scrape proves insufficient). SPA view (#16) and visual refresh (#17).
+
+**Reversibility.** Additive: a new package + middleware + a metrics port. Removing the PodMonitor
+stops scraping; the app is unaffected. No schema change.
+
+**Next steps (gated):** on approval of this ADR → BDD scenarios (`docs/use-cases/observability.feature`
++ scenario-coverage map) → TDD → implement → SemVer + docs + PodMonitor.
+
+---
+
+## ADR-031 — SPA-like reader: inline-expand summary + Q&A in the list (HTMX, no framework)
+
+**Status:** Proposed (2026-06-12). Issue #16. **Draft for review — no code yet.**
+
+**Context / requirements.** The reader is multi-page: a list of compact cards (`/`), then a
+navigation to a separate detail page (`/v/{id}`) for the full summary + the docked chat (ADR-027).
+It feels less fluid than a single integrated view. We want the full summary AND the per-video
+Q&A to open **in place in the list**, no page hop. Requirements:
+- R1: clicking a summarized card expands it in place to the full summary (summary/highlights/
+  takeaways) + the chat dock; a collapse returns it to the compact card.
+- R2: **no SPA framework** — stay HTMX + Templ (ADR-003); reuse existing fragments, not a rewrite.
+- R3: **progressive enhancement** — with JS off, the card link still navigates to `/v/{id}`
+  (the detail page stays as the no-JS + deep-link surface). Nothing becomes JS-only.
+- R4: only **summarized** cards expand; pending/rate-limited/no-caption cards keep their current
+  footer behaviour (Summarize button, waiting/none states).
+- R5: chat inside an expanded card works exactly as on the detail page (reuse `chatReveal`/
+  `chatSection` + the existing `/v/{id}/chat` endpoints, unchanged).
+
+**Decision / architecture.**
+1. **Reuse the existing fragments.** `summaryBody(r)` and `chatReveal(videoID)` already exist and
+   render the detail page; a new `expandedCard(r, chatEnabled)` composes the compact header + a
+   collapse control + `summaryBody` + `chatReveal`. `DetailPage` is refactored to also compose
+   `summaryBody` so the two never drift (DRY).
+2. **Two fragment endpoints** (mirroring the existing list/status HTMX fragment pattern):
+   `GET /v/{videoId}/expand` → `expandedCard`; collapse reuses the existing compact `VideoCard`
+   via `GET /v/{videoId}/card`. Both are list-card `<li>` fragments with the SAME `id`
+   (`video-{id}`), swapped `outerHTML` — same mechanism as `processingCard`/`VideoCard` today.
+3. **The compact card's title/"Read" affordance** becomes `hx-get=/v/{id}/expand`,
+   `hx-target=#video-{id}`, `hx-swap=outerHTML`, with `href=/v/{id}` as the no-JS fallback (R3).
+   The expanded card's collapse control is the inverse (`hx-get=/v/{id}/card`).
+4. **Only when `r.Summarized`** does the expand affordance render (R4); the other states are
+   unchanged.
+5. **v1 does NOT push the URL** (`hx-push-url`) — expand/collapse is ephemeral list UI state; the
+   detail page remains the deep-link/shareable URL. Deep-linking the open state via `hx-push-url`
+   is noted as a later option (needs list-state restore on back).
+
+**Out of scope / later.** URL push / deep-linkable open state; the visual refresh (#17) — though
+the expanded-card markup is where #17's TUI/charm styling will land, so they pair.
+
+**Reversibility.** Additive: two fragment endpoints + one templ + an affordance swap on the
+compact card. Removing the affordance reverts to plain list→detail navigation; the detail page is
+untouched. No schema change.
+
+**Next steps (gated):** on approval → BDD (`docs/use-cases/inline_expand.feature` + coverage
+map) → TDD → implement → SemVer + docs.
+
+---
+
+## ADR-032 — Visual refresh: one charm-reader layout, light + dark themes
+
+**Status:** Proposed (2026-06-12). Issue #17. **Draft for review — no code yet.** Follows the
+sketch-first explore step (3 throwaway mockups in `docs/sketches/`, screenshotted for review).
+
+**Context / decision.** The UI is flat. From the mockups, directions **B (light reader + charm)**
+and **C (dark cozy terminal)** are the SAME layout — readable sans body, monospace meta, charm
+palette accents, lipgloss-style bordered cards — in two palettes. Direction A (full-monospace TUI)
+is dropped as too heavy to read long summaries. Decision: ship that one layout with **both a light
+theme (B) and a dark theme (C)**, user-toggleable, defaulting to the OS preference.
+
+**Requirements.**
+- R1: one set of markup/structure; the two themes are pure palette (CSS variables), no duplicate templates.
+- R2: a **theme toggle** persisted across visits; default to `prefers-color-scheme` when no choice stored.
+- R3: charm language in both — mint/purple/pink accents, mono meta + section labels, lipgloss
+  bordered/gradient cards, the (fixed) ASCII tapir; readable sans body.
+- R4: style the existing pieces — list, compact card, **expanded card incl. the already-present
+  video embed (ADR-031/summaryBody)**, detail page, chat dock, the queue note, the charm spinner.
+- R5: WCAG-AA contrast for body text in BOTH themes; keep `prefers-reduced-motion` (already honoured).
+- R6: stay HTMX+Templ; no CSS framework.
+
+**Architecture.**
+1. **Palette as CSS variables.** `:root` holds the light (B) tokens; `:root[data-theme="dark"]`
+   holds the dark (C) tokens; a `prefers-color-scheme: dark` media block sets the dark tokens when
+   no explicit `data-theme` is set. All component CSS references variables only (R1). The existing
+   `CharmMint/Purple/Pink/Cream/Dim` Go consts remain the source for the spinner's inline colours.
+2. **Theme toggle** = a small inline script (a dozen lines, no framework) in `Layout`: on load,
+   apply stored theme (localStorage) or fall through to the media query; a header toggle button
+   flips `data-theme` on `<html>` and stores it. This is the one new bit of JS; everything else
+   stays server-rendered + HTMX. (Considered: cookie + server-render — rejected, a full round-trip
+   per toggle is clunky for a pure presentation flip.)
+3. **Scope = the `styleTag` CSS in `view.go`** (the single style source) plus tiny class hooks in
+   the templ where needed; content/structure are unchanged, so existing view tests keep passing.
+
+**Verification.** The deployed UI is behind auth (web-shot can't log in), so visual review is via
+the mockups now + a styled full-set mockup screenshot before merge, then a live eyeball on device.
+Automated tests stay structural/behavioural (theme tokens present, toggle persists, expanded card
+embeds the video, no-JS still renders a readable default) — colours are not unit-tested.
+
+**Reversibility.** A CSS theme swap + one small script + a few class hooks; revert `styleTag` to
+roll back. No schema, no structural change.
+
+**Next steps (gated):** on approval → BDD (`docs/use-cases/visual_theme.feature` + coverage map)
+→ TDD → implement → SemVer + docs.
+
+---
+
 ## Rejected alternatives
 
 Approaches considered during the 2026-06-02 planning + grill session and **deliberately not
@@ -757,7 +1328,7 @@ maps to the ADR that settles it.
 | Lifting shared packages into a `brain-common` module | Couples Tapir's release cycle to the monolith for negligible code savings | ADR-004 |
 | Importing/replicating the filesystem `brain` package | Assumes co-location with the brain git checkout; wrong for a standalone networked service | ADR-005 |
 | Reusing `ingestion`'s `oauth` package for YouTube/Vimeo | Same name, opposite direction — it's inbound MCP-server auth, not outbound provider OAuth | ADR-006 |
-| Global cross-tenant `videos`/`transcripts` table (dedup) | Reintroduces the cross-domain DB coupling the homelab review is removing; at 1–5 users, re-summarizing is cheaper than the coupling | data-model.md |
+| Global cross-tenant `videos`/`transcripts` table (dedup) | Reintroduces the cross-domain DB coupling the homelab review is removing; at 1–5 users, re-summarizing is cheaper than the coupling. **Transcripts half reopened by ADR-021** — the avoided cost there is a rate-gated, reputation-risky *caption fetch*, not LLM re-summarization, so it outweighs the coupling; **videos stay per-user.** | data-model.md, **ADR-021** (transcripts only) |
 | Audio-download + Whisper STT in the core path | ToS-grey, breakage-prone (yt-dlp), contends for koala GPU with the JEPA PoC; captions alone test the core hypothesis | ADR-007 |
 | Building multi-tenant SaaS / Google OAuth verification now | "Real users soon" was lowered to Future B; SaaS machinery before the Stage 0 self-use gate is the primary documented anti-goal | ADR-008, VISION |
 | Delegating the S5 reuse spike to an agent swarm | A 1-hour sequential read-and-judge with a single coupled conclusion; orchestration overhead exceeds the work, and it's Diamond-1 judgment the maintainer wanted to own | (process note) |
@@ -766,6 +1337,7 @@ maps to the ADR that settles it.
 | Feedback-based Stage 0 gate (friends saying it's useful) | Politeness bias makes asked-for feedback the least reliable signal; return-usage is the real test | ADR-016 |
 | Reverse the Dex-write invite flow (Google OIDC only) | Some intended Future-B users won't use Google; OIDC-only leaves them with no onboarding path — invite flow is load-bearing | ADR-017 |
 | k8s CronJob for scheduled discovery (vs in-process) | At Future-B scale the in-process scheduler is simpler to deploy; CronJob's failure-isolation benefit was weighed and traded away knowingly (revisit if >1 replica or load grows) | ADR-018 |
+| Cached-transcript-first onboarding burst (instant, zero-fetch picks) | Live pilot DB: ~3% cross-user video overlap, 0 cached-and-unsummarized, a new user's newest-20 are 20/20 uncached — newest-first and cached-first are structurally incompatible. Empty lever at pilot scale | ADR-028 |
 
 If a future case genuinely reopens one of these, that's a new ADR superseding the relevant one —
 not a silent reversal.

LANGUAGE.md

@@ -0,0 +1,26 @@
+# Vocabulary (hand-written pilot 2026-06 — will be generated by langgen in Phase 2)
+
+| Term | Means | Never say |
+|---|---|---|
+| transcript | Captions-first text of a video; the source for summarizing. Shared store keyed by `(provider, video_id)`. | "subtitles file", "the audio" |
+| video | Per-user record of a seen video; the unit of work. Not globally deduped. | "the shared video" |
+| subscription | A watched channel on a user's connection that Tapir polls for new videos. | "feed", "follow" |
+| summary | A video's produced output: summary text + highlights + takeaways + AI provenance. | "transcript" |
+| highlight | A notable point pulled from a video (`Summary.Highlights`). | "takeaway" |
+| takeaway | An actionable conclusion from a video (`Summary.Takeaways`). | "highlight" |
+| sink | A delivery destination for a summary (`store`, `brain`). New one = new adapter. | "the database" |
+| AI router | Local-first chain: local Primary → local fallback → external worst-case. | "the API" |
+| BYO-AI fallback | User's own external AI key, used only when local fails; opt-in. Without it, content is never sent externally. | "the default AI" |
+| brain | Persistent homelab knowledge store; in Tapir, one optional HTTP sink (`brain_ingest`), not the filesystem package. | "the database", "the store" |
+| LiteLLM gateway | Local AI gateway (`koala:30401/v1`); the Primary in the AI router. | "piguard:4000", "koala:4000", "the cloud" |
+| connection | A connected video account a user authorizes via OAuth; subscriptions hang off it. | "login", "session" |
+
+## Caveman rubric
+Before any HIGH/CRITICAL operation, output one line:
+`caveman: me <verb> <object>, not <excluded thing>`
+Valid iff: (1) only vocabulary terms + plain verbs, (2) a stranger could identify
+the exact operation, (3) names one thing explicitly NOT being done.
+
+Examples:
+- `caveman: me delete user connection, not the shared transcript`
+- `caveman: me send transcript to BYO-AI fallback, not the LiteLLM gateway`

cmd/tapir/chat_test.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"strings"
+	"testing"
+
+	"git.d-ma.be/mathias/tapir/internal/config"
+)
+
+// TestChatModelsReuseTheChainLocalFirst: the switcher offers the ADR-022 chain in
+// order, deduped — primary, local fallback, cloud.
+func TestChatModelsReuseTheChainLocalFirst(t *testing.T) {
+	got := chatModels(config.Config{
+		SummarizerModel:    "koala/phi4-mini",
+		FallbackModel:      "iguana/gemma4-26b",
+		CloudFallbackModel: "berget/mistral-small",
+	})
+	want := []string{"koala/phi4-mini", "iguana/gemma4-26b", "berget/mistral-small"}
+	if strings.Join(got, ",") != strings.Join(want, ",") {
+		t.Fatalf("chatModels = %v, want %v", got, want)
+	}
+}
+
+// TestChatCloudModelAbsentWhenDisabled: the local-first / NDA lever — with the
+// cloud fallback empty (TAPIR_CLOUD_FALLBACK_MODEL=""), no external model is
+// offered in the switcher, so chat content never leaves the local stack (ADR-027,
+// honouring ADR-022's "content stays local" guarantee).
+func TestChatCloudModelAbsentWhenDisabled(t *testing.T) {
+	got := chatModels(config.Config{
+		SummarizerModel:    "koala/phi4-mini",
+		FallbackModel:      "iguana/gemma4-26b",
+		CloudFallbackModel: "",
+	})
+	for _, m := range got {
+		if strings.HasPrefix(m, "berget/") || strings.Contains(m, "mistral") {
+			t.Fatalf("cloud model %q offered though the cloud fallback is disabled", m)
+		}
+	}
+	want := []string{"koala/phi4-mini", "iguana/gemma4-26b"}
+	if strings.Join(got, ",") != strings.Join(want, ",") {
+		t.Fatalf("chatModels = %v, want %v", got, want)
+	}
+}
+
+// TestChatModelsDedup: a config that reuses one alias across slots collapses to a
+// single switcher entry (no duplicate options).
+func TestChatModelsDedup(t *testing.T) {
+	got := chatModels(config.Config{
+		SummarizerModel:    "koala/phi4-mini",
+		FallbackModel:      "koala/phi4-mini",
+		CloudFallbackModel: "",
+	})
+	if len(got) != 1 || got[0] != "koala/phi4-mini" {
+		t.Fatalf("chatModels = %v, want a single deduped entry", got)
+	}
+}
+
+// TestBuildChatNilWithoutGateway: no gateway → no chat backend (routes unmounted,
+// read path unaffected).
+func TestBuildChatNilWithoutGateway(t *testing.T) {
+	if c := buildChat(config.Config{GatewayURL: ""}); c != nil {
+		t.Fatal("buildChat must return nil without a gateway URL")
+	}
+}

cmd/tapir/discovery.go

@@ -5,7 +5,7 @@ import (
 	"log/slog"
 	"sync"
 
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/runner"
 )
 
 // discoveryRunner runs one user's discovery pass.

cmd/tapir/discovery_test.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/runner"
 )
 
 // serialize must guarantee at most one discovery pass runs at a time, so a

cmd/tapir/env.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"os"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // Env var names for the read-only CLI. DSN and user id are never hardcoded — the

cmd/tapir/format_test.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 func TestFormatListColumnsAndOrdering(t *testing.T) {

cmd/tapir/list.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 	"text/tabwriter"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // runList prints the user's stored summaries as a table, most recent first.

cmd/tapir/main.go

@@ -23,14 +23,15 @@ import (
 	"sync"
 	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/secrets"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/youtube"
-	"gitea.d-ma.be/mathias/tapir/internal/auth"
-	"gitea.d-ma.be/mathias/tapir/internal/config"
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
-	"gitea.d-ma.be/mathias/tapir/internal/web/oidc"
+	"git.d-ma.be/mathias/tapir/internal/adapters/secrets"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/youtube"
+	"git.d-ma.be/mathias/tapir/internal/auth"
+	"git.d-ma.be/mathias/tapir/internal/config"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
+	"git.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/web/oidc"
 )
 
 func main() {
@@ -136,7 +137,8 @@ func cmdRun(ctx context.Context, log *slog.Logger) error {
 
 	r := runner.New(engine.Source, st, engine, cfg.UserID, log,
 		runner.WithBackoff(cfg.FetchBackoff),
-		runner.WithAutoWindow(cfg.AutoSummarizeWindow))
+		runner.WithAutoWindow(cfg.AutoSummarizeWindow),
+		runner.WithCaptionMemory(cfg.ChannelCaptionlessThreshold, cfg.ChannelCaptionlessWindow))
 
 	log.Info("starting run", "user", cfg.UserID, "model", cfg.SummarizerModel,
 		"gateway", cfg.GatewayURL, "poll_interval", cfg.PollInterval, "fetch_backoff", cfg.FetchBackoff,
@@ -196,6 +198,15 @@ func cmdServe(ctx context.Context, log *slog.Logger) error {
 	secretStore := secrets.NewFileStore(cfg.SecretsFile)
 	app := &web.App{Store: st, Identity: st, Auth: authn, Secrets: secretStore, Log: log, RecencyWindow: cfg.AutoSummarizeWindow}
 
+	// Per-video deeper-dive chat over the STORED transcript (ADR-027). Enabled
+	// whenever a gateway is configured — it needs no YouTube credentials because it
+	// never fetches. Guarded so a typed-nil never lands in the interface field
+	// (which would mount the routes over a nil backend).
+	if c := buildChat(cfg); c != nil {
+		app.Chat = c
+		log.Info("web chat enabled (stored-transcript only)", "models", chatModels(cfg))
+	}
+
 	// User onboarding is handled by the IdP (Authentik invite flow), not Tapir —
 	// the Dex local-password provisioning path was removed (ADR-019). An
 	// authenticated subject with no Tapir user is routed to /register.
@@ -252,23 +263,36 @@ func cmdServe(ctx context.Context, log *slog.Logger) error {
 		// One lock shared by the scheduler and connect-triggered passes (#6) so
 		// they never fetch concurrently — the single-fetcher invariant (ADR-018).
 		runUser := serialize(&sync.Mutex{}, rawRunUser)
-		// Onboarding burst (Feature 1): after the connect-triggered discovery pass,
-		// summarize up to OnboardSummarizeCount of the user's NEWEST unsummarized
-		// videos so a fresh account gets real summaries in its first session. Hard
-		// cap; explicit, so it bypasses the recency window — but every fetch still
-		// goes through globalFetchGate via the Processor. No-op when disabled
-		// (count 0) or queue-only (no Processor).
+		// Onboarding burst (Feature 1, refined by ADR-028): after the connect-triggered
+		// discovery pass, summarize up to OnboardSummarizeCount of the user's newest
+		// LIKELY-GOOD unsummarized videos so a fresh account gets a strong first
+		// session. Selection avoids known-junk (Shorts/over-long/livestream VODs via
+		// the persisted duration); the burst leads its chain with the stronger onboard
+		// model. Hard cap; explicit, so it bypasses the recency window — but every
+		// fetch still goes through globalFetchGate. No-op when disabled (count 0) or
+		// queue-only (no processor).
+		//
+		// burstProcessor leads with the stronger model (ADR-028); it collapses onto the
+		// shared Processor when the onboard model is empty/equal-to-primary or the
+		// engine config is incomplete.
+		burstProcessor := app.Processor
+		if burstEngine, berr := buildBurstProcessor(cfg, st); berr != nil {
+			return berr
+		} else if burstEngine != nil {
+			burstProcessor = &engineProcessor{engine: burstEngine, store: st}
+			log.Info("onboarding burst uses a stronger model", "onboard_model", cfg.OnboardSummarizerModel)
+		}
 		onboard := func(ctx context.Context, userID string) {
-			if cfg.OnboardSummarizeCount <= 0 || app.Processor == nil {
+			if cfg.OnboardSummarizeCount <= 0 || burstProcessor == nil {
 				return
 			}
-			ids, err := st.NewestUnsummarizedVideoIDs(ctx, userID, cfg.OnboardSummarizeCount)
+			ids, err := st.OnboardBurstVideoIDs(ctx, userID, cfg.OnboardSummarizeCount, cfg.MinVideoSeconds, cfg.OnboardMaxVideoSeconds)
 			if err != nil {
-				log.Warn("onboarding: list newest unsummarized", "user", userID, "err", err)
+				log.Warn("onboarding: list burst candidates", "user", userID, "err", err)
 				return
 			}
 			for _, id := range ids {
-				if err := app.Processor.ProcessVideo(ctx, userID, id); err != nil {
+				if err := burstProcessor.ProcessVideo(ctx, userID, id); err != nil {
 					log.Warn("onboarding: summarize", "user", userID, "video", id, "err", err)
 				}
 			}
@@ -287,16 +311,34 @@ func cmdServe(ctx context.Context, log *slog.Logger) error {
 
 	srv := &http.Server{
 		Addr:              cfg.HTTPAddr,
-		Handler:           app.Router(),
+		Handler:           metrics.HTTPMiddleware(app.Router()),
 		ReadHeaderTimeout: 10 * time.Second,
 	}
 
+	// Prometheus /metrics on a SEPARATE port (ADR-030) — never on the public app
+	// mux, so a scrape is in-cluster only. Empty TAPIR_METRICS_ADDR disables it.
+	var metricsSrv *http.Server
+	if cfg.MetricsAddr != "" {
+		mmux := http.NewServeMux()
+		mmux.Handle("GET /metrics", metrics.Handler())
+		metricsSrv = &http.Server{Addr: cfg.MetricsAddr, Handler: mmux, ReadHeaderTimeout: 10 * time.Second}
+		go func() {
+			log.Info("serving metrics", "addr", cfg.MetricsAddr)
+			if err := metricsSrv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				log.Error("metrics server", "err", err)
+			}
+		}()
+	}
+
 	// Graceful shutdown on signal: stop accepting, drain in-flight requests.
 	go func() {
 		<-ctx.Done()
 		shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 		defer cancel()
 		_ = srv.Shutdown(shutdownCtx)
+		if metricsSrv != nil {
+			_ = metricsSrv.Shutdown(shutdownCtx)
+		}
 	}()
 
 	log.Info("serving web ui", "addr", cfg.HTTPAddr, "user", cfg.UserID)

cmd/tapir/processor.go

@@ -3,17 +3,20 @@ package main
 import (
 	"context"
 	"fmt"
+	"strings"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/llm"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/secrets"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/summarizer"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/youtube"
-	"gitea.d-ma.be/mathias/tapir/internal/config"
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
-	"gitea.d-ma.be/mathias/tapir/internal/usecase"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/adapters/chat"
+	"git.d-ma.be/mathias/tapir/internal/adapters/llm"
+	"git.d-ma.be/mathias/tapir/internal/adapters/secrets"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/summarizer"
+	"git.d-ma.be/mathias/tapir/internal/adapters/youtube"
+	"git.d-ma.be/mathias/tapir/internal/config"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
+	"git.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/usecase"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // videoFetcher adapts the YouTube adapter to web.VideoFetcher for the paste flow
@@ -42,28 +45,172 @@ func (f videoFetcher) FetchVideo(ctx context.Context, userID, videoID string) (d
 // queue-only fallback: the web UI keeps working (the button just queues) and
 // `tapir run` reports the gap via its own ValidateForRun. Missing engine config
 // is never an error here.
+// buildSummarizer wires the summarization endpoint chain (ADR-022) shared by the
+// web "Summarize now" path and the scheduler's per-user runners. The chain is:
+// primary (local, fast) → local fallback → cloud fallback (worst case). Each
+// endpoint reaches the same LiteLLM gateway with a different model alias — the
+// gateway fronts both llama-swap and berget — so a fallback is just a different
+// alias, not a second client config. Empty model entries are skipped, so a
+// client deployment can set the cloud fallback empty to keep content local.
+func buildSummarizer(cfg config.Config) *summarizer.Summarizer {
+	mk := summarizerEndpoint(cfg)
+	eps := []summarizer.Endpoint{mk(cfg.SummarizerModel)}
+	if cfg.FallbackModel != "" && cfg.FallbackModel != cfg.SummarizerModel {
+		eps = append(eps, mk(cfg.FallbackModel))
+	}
+	if cfg.CloudFallbackModel != "" && cfg.CloudFallbackModel != cfg.SummarizerModel {
+		eps = append(eps, mk(cfg.CloudFallbackModel))
+	}
+	return summarizer.NewChain(eps, cfg.MaxTranscriptChars)
+}
+
+// summarizerEndpoint returns a constructor for a chain endpoint over the one
+// LiteLLM gateway, varying only the model alias (the gateway fronts both
+// llama-swap and berget). Shared by the standard and burst chains.
+func summarizerEndpoint(cfg config.Config) func(model string) summarizer.Endpoint {
+	return func(model string) summarizer.Endpoint {
+		return summarizer.Endpoint{
+			Client:   llm.New(cfg.GatewayURL, cfg.GatewayKey, model, cfg.SummarizerTimeout, llm.WithMaxTokens(cfg.SummaryMaxTokens), llm.WithUsageHook(metrics.RecordTokens)),
+			Provider: providerOf(model),
+			Model:    model,
+		}
+	}
+}
+
+// burstChainModels is the ordered, deduped model list for the onboarding burst
+// (ADR-028): the stronger onboard model leads, then the standard ADR-022 chain
+// (primary → local fallback → cloud) follows as resilience. Empty entries are
+// dropped and duplicates collapsed, so the NDA lever (empty cloud fallback) keeps
+// the burst chain fully local exactly as the standard chain does.
+func burstChainModels(cfg config.Config) []string {
+	var models []string
+	add := func(m string) {
+		if m == "" {
+			return
+		}
+		for _, e := range models {
+			if e == m {
+				return
+			}
+		}
+		models = append(models, m)
+	}
+	add(cfg.OnboardSummarizerModel)
+	add(cfg.SummarizerModel)
+	add(cfg.FallbackModel)
+	add(cfg.CloudFallbackModel)
+	return models
+}
+
+// buildBurstSummarizer builds the onboarding-burst summarizer chain (ADR-028):
+// the onboard model first, then the standard chain as fallback, deduped.
+func buildBurstSummarizer(cfg config.Config) *summarizer.Summarizer {
+	mk := summarizerEndpoint(cfg)
+	var eps []summarizer.Endpoint
+	for _, m := range burstChainModels(cfg) {
+		eps = append(eps, mk(m))
+	}
+	return summarizer.NewChain(eps, cfg.MaxTranscriptChars)
+}
+
+// chatModels is the ordered, local-first set of models offered in the chat
+// switcher (ADR-027), reusing the ADR-022 chain: primary → local fallback →
+// cloud. Empty entries are dropped and duplicates collapsed, so a client/NDA
+// deployment that sets the cloud fallback empty simply has no external model in
+// the switcher — the same local-first lever the summarizer honours.
+func chatModels(cfg config.Config) []string {
+	var models []string
+	add := func(m string) {
+		if m == "" {
+			return
+		}
+		for _, e := range models {
+			if e == m {
+				return
+			}
+		}
+		models = append(models, m)
+	}
+	add(cfg.SummarizerModel)
+	add(cfg.FallbackModel)
+	add(cfg.CloudFallbackModel)
+	return models
+}
+
+// buildChat wires the per-video chat service (ADR-027): a Completer factory over
+// the SAME LiteLLM gateway the summarizer uses (a different alias per model, not a
+// second client config) and the same transcript-truncation budget. It returns nil
+// when no gateway is configured — chat is simply not mounted, the read path is
+// unaffected. It deliberately takes NO YouTube source: chat is stored-only.
+func buildChat(cfg config.Config) *chat.Service {
+	if cfg.GatewayURL == "" {
+		return nil
+	}
+	models := chatModels(cfg)
+	if len(models) == 0 {
+		return nil
+	}
+	newClient := func(model string) chat.Completer {
+		return llm.New(cfg.GatewayURL, cfg.GatewayKey, model, cfg.SummarizerTimeout, llm.WithMaxTokens(cfg.SummaryMaxTokens), llm.WithUsageHook(metrics.RecordTokens))
+	}
+	return chat.New(newClient, models, cfg.MaxTranscriptChars)
+}
+
+// providerOf maps a model alias to the domain AIProvider recorded on summaries.
+// A "berget/" alias is an external provider; everything else is the local stack.
+func providerOf(model string) string {
+	if strings.HasPrefix(model, "berget/") {
+		return "berget"
+	}
+	return "local"
+}
+
 func buildProcessor(cfg config.Config, st *store.Store) (*usecase.Engine, error) {
 	if cfg.GatewayURL == "" || cfg.YTClientID == "" || cfg.YTClientSecret == "" || cfg.SecretsFile == "" {
 		return nil, nil
 	}
 
-	secretStore := secrets.NewFileStore(cfg.SecretsFile)
-	src := youtube.New(youtube.Config{
+	src := newYouTubeSource(cfg, secrets.NewFileStore(cfg.SecretsFile))
+	sum := buildSummarizer(cfg)
+
+	// The store is both the summary sink and the shared transcript cache (ADR-021):
+	// the engine reads stored transcripts before any caption fetch and writes
+	// resolved ones back, so re-analysis never re-touches YouTube.
+	eng := usecase.NewEngine(src, sum, st)
+	eng.Transcripts = st
+	return eng, nil
+}
+
+// newYouTubeSource builds the captions-first VideoSource shared by the standard
+// and burst processors — same per-process YouTube credentials and ADR-023 Shorts
+// filter; only the summarizer chain differs between them.
+func newYouTubeSource(cfg config.Config, secretStore ports.SecretStore) ports.VideoSource {
+	return youtube.New(youtube.Config{
 		ClientID:           cfg.YTClientID,
 		ClientSecret:       cfg.YTClientSecret,
 		TokenSecretRef:     cfg.YTTokenRef,
 		PreferredLanguages: []string{"en"},
+		MinVideoSeconds:    cfg.MinVideoSeconds,
 	}, secretStore)
+}
 
-	// Local Primary only; no BYO fallback for the demo (fallback nil).
-	primary := summarizer.Endpoint{
-		Client:   llm.New(cfg.GatewayURL, cfg.GatewayKey, cfg.SummarizerModel, cfg.SummarizerTimeout),
-		Provider: "local",
-		Model:    cfg.SummarizerModel,
+// buildBurstProcessor wires a processor whose summarizer leads with the stronger
+// onboard model (ADR-028), used only by the connect-time burst over the SAME
+// store / transcript cache / sink — a wiring choice; the engine and ports are
+// unchanged. Returns (nil, nil) — the collapse lever — when the onboard model is
+// empty or equal to the primary (the burst then reuses the shared processor), or
+// when the engine config is incomplete (queue-only, same as buildProcessor).
+func buildBurstProcessor(cfg config.Config, st *store.Store) (*usecase.Engine, error) {
+	if cfg.OnboardSummarizerModel == "" || cfg.OnboardSummarizerModel == cfg.SummarizerModel {
+		return nil, nil
 	}
-	sum := summarizer.New(primary, nil)
-
-	return usecase.NewEngine(src, sum, st), nil
+	if cfg.GatewayURL == "" || cfg.YTClientID == "" || cfg.YTClientSecret == "" || cfg.SecretsFile == "" {
+		return nil, nil
+	}
+	src := newYouTubeSource(cfg, secrets.NewFileStore(cfg.SecretsFile))
+	eng := usecase.NewEngine(src, buildBurstSummarizer(cfg), st)
+	eng.Transcripts = st
+	return eng, nil
 }
 
 // engineProcessor adapts the engine (which works in terms of a domain.Video) to
@@ -78,6 +225,11 @@ type engineProcessor struct {
 }
 
 func (p *engineProcessor) ProcessVideo(ctx context.Context, userID, videoID string) error {
+	// This is the user-initiated (foreground) path — a click on "Summarize",
+	// "Try now", or a pasted URL. Mark the context so the caption gate gives it
+	// priority over the background sweep (ADR-026, Pillar A).
+	ctx = youtube.ForegroundContext(ctx)
+
 	row, err := p.store.GetVideoRow(ctx, userID, videoID)
 	if err != nil {
 		return fmt.Errorf("load video %q: %w", videoID, err)
@@ -97,7 +249,28 @@ func (p *engineProcessor) ProcessVideo(ctx context.Context, userID, videoID stri
 	if err != nil {
 		return fmt.Errorf("process video %q: %w", videoID, err)
 	}
-	if res.Summary != nil {
+
+	// Record the outcome so the status endpoint can show honest state (ADR-025):
+	// a 429'd or caption-less click used to leave transcript_status unset, so the
+	// poll silently reverted to the "Summarize" button. Mirror the runner: stamp
+	// rate_limited / none / fetched. A rate-limited video keeps its requested flag
+	// so the background sweep retries it; none and fetched are terminal here.
+	switch {
+	case res.Skipped && res.TranscriptSource == string(domain.SourceRateLimited):
+		if err := p.store.SetTranscriptStatus(ctx, userID, videoID, "rate_limited"); err != nil {
+			return fmt.Errorf("set rate_limited status %q: %w", videoID, err)
+		}
+	case res.Skipped:
+		if err := p.store.SetTranscriptStatus(ctx, userID, videoID, "none"); err != nil {
+			return fmt.Errorf("set none status %q: %w", videoID, err)
+		}
+		if err := p.store.ClearSummarizeRequested(ctx, userID, videoID); err != nil {
+			return fmt.Errorf("clear summarize flag %q: %w", videoID, err)
+		}
+	case res.Summary != nil:
+		if err := p.store.SetTranscriptStatus(ctx, userID, videoID, "fetched"); err != nil {
+			return fmt.Errorf("set fetched status %q: %w", videoID, err)
+		}
 		if err := p.store.ClearSummarizeRequested(ctx, userID, videoID); err != nil {
 			return fmt.Errorf("clear summarize flag %q: %w", videoID, err)
 		}

cmd/tapir/processor_test.go

@@ -3,7 +3,7 @@ package main
 import (
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/config"
+	"git.d-ma.be/mathias/tapir/internal/config"
 )
 
 // TestBuildProcessorNilOnIncompleteConfig asserts the queue-only fallback: when a
@@ -45,3 +45,65 @@ func TestBuildProcessorNilOnIncompleteConfig(t *testing.T) {
 		})
 	}
 }
+
+// TestBurstChainModelsLeadsWithOnboardModel: the onboarding burst chain (ADR-028)
+// leads with the stronger onboard model, then falls back through the standard
+// ADR-022 chain (primary -> local fallback -> cloud), deduped.
+func TestBurstChainModelsLeadsWithOnboardModel(t *testing.T) {
+	got := burstChainModels(config.Config{
+		OnboardSummarizerModel: "iguana/gemma4-26b",
+		SummarizerModel:        "koala/phi4-mini",
+		FallbackModel:          "iguana/gemma4-26b", // also the onboard model -> dedup
+		CloudFallbackModel:     "berget/mistral-small",
+	})
+	want := []string{"iguana/gemma4-26b", "koala/phi4-mini", "berget/mistral-small"}
+	if len(got) != len(want) {
+		t.Fatalf("burstChainModels = %v, want %v", got, want)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("burstChainModels = %v, want %v", got, want)
+		}
+	}
+}
+
+// TestBurstChainModelsCloudAbsentWhenDisabled: the NDA lever holds for the burst
+// too — empty cloud fallback keeps the burst chain fully local.
+func TestBurstChainModelsCloudAbsentWhenDisabled(t *testing.T) {
+	got := burstChainModels(config.Config{
+		OnboardSummarizerModel: "iguana/gemma4-26b",
+		SummarizerModel:        "koala/phi4-mini",
+		CloudFallbackModel:     "",
+	})
+	for _, m := range got {
+		if m == "" || m == "berget/mistral-small" {
+			t.Fatalf("cloud model leaked into burst chain: %v", got)
+		}
+	}
+}
+
+// TestBuildBurstProcessorNilWhenCollapsed: an empty or primary-equal onboard model
+// collapses the burst onto the shared processor (buildBurstProcessor returns nil).
+func TestBuildBurstProcessorNilWhenCollapsed(t *testing.T) {
+	base := config.Config{
+		GatewayURL:      "http://gw/v1",
+		YTClientID:      "id",
+		YTClientSecret:  "secret",
+		SecretsFile:     "/tmp/secrets.json",
+		SummarizerModel: "koala/phi4-mini",
+	}
+	t.Run("empty onboard model", func(t *testing.T) {
+		base.OnboardSummarizerModel = ""
+		eng, err := buildBurstProcessor(base, nil)
+		if err != nil || eng != nil {
+			t.Fatalf("buildBurstProcessor = (%v, %v), want (nil, nil)", eng, err)
+		}
+	})
+	t.Run("onboard model equals primary", func(t *testing.T) {
+		base.OnboardSummarizerModel = "koala/phi4-mini"
+		eng, err := buildBurstProcessor(base, nil)
+		if err != nil || eng != nil {
+			t.Fatalf("buildBurstProcessor = (%v, %v), want (nil, nil)", eng, err)
+		}
+	})
+}

cmd/tapir/report.go

@@ -6,14 +6,36 @@ import (
 	"io"
 	"os"
 	"text/tabwriter"
+	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // gateThreshold is the Stage-0 gate (VISION/ADR-016): usage in >= 2 distinct
 // weeks. The gate passes when any user reaches it.
 const gateThreshold = 2
 
+// defaultGateStart is the date Stage-0 return-usage tracking begins: the morning
+// the pilot was actually unblocked and summaries started flowing (2026-06-11).
+// Activity before this — testing, the period the pilot was stuck on zero — is
+// noise and must not count toward the gate. Override with TAPIR_USAGE_GATE_START
+// (YYYY-MM-DD). The gate measures whether users RETURN once it genuinely works.
+const defaultGateStart = "2026-06-11"
+
+// gateStart resolves the baseline date from TAPIR_USAGE_GATE_START or the default,
+// parsed as a UTC calendar day.
+func gateStart() (time.Time, error) {
+	v := os.Getenv("TAPIR_USAGE_GATE_START")
+	if v == "" {
+		v = defaultGateStart
+	}
+	t, err := time.Parse("2006-01-02", v)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("TAPIR_USAGE_GATE_START=%q: want YYYY-MM-DD: %w", v, err)
+	}
+	return t, nil
+}
+
 // runReport prints the Stage-0 usage gate: per-user distinct active weeks (reads
 // UNION acts) and the pass/fail verdict. Read-only, cross-user — needs only
 // TAPIR_DB_DSN (not TAPIR_USER_ID; the report enumerates all users itself).
@@ -28,16 +50,24 @@ func runReport(ctx context.Context, _ []string) error {
 	}
 	defer s.Close()
 
-	rows, err := s.ActiveWeeks(ctx)
+	since, err := gateStart()
 	if err != nil {
 		return err
 	}
-	return formatReport(os.Stdout, rows)
+
+	rows, err := s.ActiveWeeks(ctx, since)
+	if err != nil {
+		return err
+	}
+	return formatReport(os.Stdout, rows, since)
 }
 
 // formatReport renders the per-user week counts and the gate verdict. Pure: no DB,
 // no env — so the layout and verdict logic are unit-testable without Postgres.
-func formatReport(w io.Writer, rows []store.UserActiveWeeks) error {
+func formatReport(w io.Writer, rows []store.UserActiveWeeks, since time.Time) error {
+	if _, err := fmt.Fprintf(w, "Counting usage since %s (Stage-0 gate baseline)\n\n", since.Format("2006-01-02")); err != nil {
+		return err
+	}
 	if len(rows) == 0 {
 		_, err := fmt.Fprintln(w, "no users yet")
 		return err

cmd/tapir/report_test.go

@@ -3,12 +3,15 @@ package main
 import (
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
+var testSince = time.Date(2026, 6, 11, 0, 0, 0, 0, time.UTC)
+
 func TestFormatReportColumnsAndGatePass(t *testing.T) {
 	rows := []store.UserActiveWeeks{
 		{UserID: "user-a", DisplayName: "Ada", ActiveWeeks: 3},
@@ -16,9 +19,10 @@ func TestFormatReportColumnsAndGatePass(t *testing.T) {
 	}
 
 	var b strings.Builder
-	require.NoError(t, formatReport(&b, rows))
+	require.NoError(t, formatReport(&b, rows, testSince))
 	out := b.String()
 
+	require.Contains(t, out, "since 2026-06-11", "report states the gate baseline date")
 	require.Contains(t, out, "USER")
 	require.Contains(t, out, "ACTIVE_WEEKS")
 	require.Contains(t, out, "Ada")
@@ -34,12 +38,12 @@ func TestFormatReportGateNotMet(t *testing.T) {
 	rows := []store.UserActiveWeeks{{UserID: "user-a", ActiveWeeks: 1}}
 
 	var b strings.Builder
-	require.NoError(t, formatReport(&b, rows))
+	require.NoError(t, formatReport(&b, rows, testSince))
 	require.Contains(t, b.String(), "NOT YET MET", "no user at >= 2 weeks fails the gate")
 }
 
 func TestFormatReportEmpty(t *testing.T) {
 	var b strings.Builder
-	require.NoError(t, formatReport(&b, nil))
+	require.NoError(t, formatReport(&b, nil, testSince))
 	require.Contains(t, b.String(), "no users yet")
 }

cmd/tapir/scheduler.go

@@ -6,15 +6,13 @@ import (
 	"log/slog"
 	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/llm"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/summarizer"
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/youtube"
-	"gitea.d-ma.be/mathias/tapir/internal/config"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
-	"gitea.d-ma.be/mathias/tapir/internal/usecase"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/youtube"
+	"git.d-ma.be/mathias/tapir/internal/config"
+	"git.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/usecase"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // buildUserRunner constructs a runner.Runner for one user, reusing the same
@@ -35,18 +33,20 @@ func buildUserRunner(cfg config.Config, st *store.Store, secretStore ports.Secre
 		ClientSecret:       cfg.YTClientSecret,
 		TokenSecretRef:     web.YouTubeTokenRef(userID),
 		PreferredLanguages: []string{"en"},
+		MinVideoSeconds:    cfg.MinVideoSeconds,
 	}, secretStore)
 
-	primary := summarizer.Endpoint{
-		Client:   llm.New(cfg.GatewayURL, cfg.GatewayKey, cfg.SummarizerModel, cfg.SummarizerTimeout),
-		Provider: "local",
-		Model:    cfg.SummarizerModel,
-	}
-	engine := usecase.NewEngine(src, summarizer.New(primary, nil), st)
+	engine := usecase.NewEngine(src, buildSummarizer(cfg), st)
+	// Share the transcript cache (ADR-021) on the scheduler path too — without
+	// this every scheduled pass re-fetches transcripts it already had, burning the
+	// scarce per-IP caption budget (ADR-014) and starving other users. The web
+	// "Summarize now" path already sets this; the scheduler omitting it was a bug.
+	engine.Transcripts = st
 
 	return runner.New(src, st, engine, userID, log,
 		runner.WithBackoff(cfg.FetchBackoff),
-		runner.WithAutoWindow(cfg.AutoSummarizeWindow)), nil
+		runner.WithAutoWindow(cfg.AutoSummarizeWindow),
+		runner.WithCaptionMemory(cfg.ChannelCaptionlessThreshold, cfg.ChannelCaptionlessWindow)), nil
 }
 
 // userLister enumerates every registered user and reports a user's video
@@ -64,6 +64,7 @@ type userLister interface {
 // isolation). Returns the stats summed across users.
 func runDiscoveryPass(
 	ctx context.Context,
+	pass int,
 	lister userLister,
 	runUser func(context.Context, string) (runner.Stats, error),
 	log *slog.Logger,
@@ -74,15 +75,17 @@ func runDiscoveryPass(
 		return runner.Stats{}
 	}
 
-	log.Info("scheduler: starting discovery pass", "users", len(users))
-	var total runner.Stats
+	// Keep only users with a video connection. A pass for a connectionless user
+	// (e.g. a stale Dex-era orphan identity) only tries to resolve a token that
+	// was never minted, logging a spurious "ref not found" every tick. Filtering
+	// here — BEFORE rotation — also keeps fairness honest: rotation is over the
+	// users that actually consume the caption budget, so a dead identity can't eat
+	// a rotation slot and skew the lead share.
+	var connected []store.UserIdentity
 	for _, u := range users {
 		if ctx.Err() != nil {
-			break // shutting down: stop enumerating
+			return runner.Stats{} // shutting down
 		}
-		// Skip users with no video connection. A discovery pass for them only
-		// attempts to resolve a token that was never minted, logging a spurious
-		// "ref not found" every tick (e.g. stale Dex-era orphan identities).
 		conns, err := lister.ConnectionsForUser(ctx, u.UserID)
 		if err != nil {
 			log.Warn("scheduler: list connections failed", "user", u.UserID, "err", err)
@@ -92,6 +95,22 @@ func runDiscoveryPass(
 			log.Debug("scheduler: skipping user with no video connections", "user", u.UserID)
 			continue
 		}
+		connected = append(connected, u)
+	}
+
+	// Rotate who goes first each pass. Caption fetches share one per-egress-IP
+	// rate budget (ADR-014); whoever runs first each pass spends the pre-throttle
+	// window, so a FIXED order permanently starves whoever is last (a new pilot
+	// user got 0 fetches for 12h while the first-listed user got all of them).
+	// Rotation over the connected set gives each real user the lead in turn.
+	connected = rotateUsers(connected, pass)
+
+	log.Info("scheduler: starting discovery pass", "users", len(connected))
+	var total runner.Stats
+	for _, u := range connected {
+		if ctx.Err() != nil {
+			break // shutting down: stop enumerating
+		}
 		stats, err := runUser(ctx, u.UserID)
 		total = sumStats(total, stats)
 		if err != nil {
@@ -103,6 +122,7 @@ func runDiscoveryPass(
 		"skipped_seen", total.SkippedSeen, "skipped_no_text", total.SkippedNoText,
 		"skipped_manual", total.SkippedManual, "skipped_too_old", total.SkippedTooOld,
 		"skipped_rate_limited", total.SkippedRateLimited,
+		"skipped_no_caption_channel", total.SkippedNoCaptionChannel,
 		"channel_unavailable", total.ChannelUnavailable, "errors", total.Errors)
 	return total
 }
@@ -123,7 +143,18 @@ func runScheduler(
 		return // disabled
 	}
 
-	runDiscoveryPass(ctx, lister, runUser, log)
+	// Derive the rotation offset from wall-clock, NOT an in-memory counter. A
+	// counter reset to 0 on every pod restart always hands the lead to the
+	// first-listed user — so frequent deploys re-starve whoever is last (exactly
+	// what happened to the first pilot user during a deploy-heavy session). A
+	// time-based offset advances with real time and is identical across restarts,
+	// so the lead rotates fairly regardless of how often the pod bounces.
+	runPass := func() {
+		pass := int(time.Now().Unix() / int64(interval/time.Second))
+		runDiscoveryPass(ctx, pass, lister, runUser, log)
+	}
+
+	runPass()
 
 	ticker := time.NewTicker(interval)
 	defer ticker.Stop()
@@ -132,23 +163,44 @@ func runScheduler(
 		case <-ctx.Done():
 			return
 		case <-ticker.C:
-			runDiscoveryPass(ctx, lister, runUser, log)
+			runPass()
 		}
 	}
 }
 
+// rotateUsers left-rotates users by pass positions so a different user leads each
+// pass. With n users, user i leads on every pass where pass ≡ i (mod n). A pass
+// offset that is negative or exceeds n is normalised. Order within the rotation
+// is otherwise preserved, so the set of users run is unchanged — only who is
+// first (and thus wins the scarce caption-fetch budget) rotates.
+func rotateUsers(users []store.UserIdentity, pass int) []store.UserIdentity {
+	n := len(users)
+	if n <= 1 {
+		return users
+	}
+	off := ((pass % n) + n) % n
+	if off == 0 {
+		return users
+	}
+	out := make([]store.UserIdentity, 0, n)
+	out = append(out, users[off:]...)
+	out = append(out, users[:off]...)
+	return out
+}
+
 // sumStats adds two passes' stats field-wise, so runDiscoveryPass can report a
 // per-tick aggregate across all users.
 func sumStats(a, b runner.Stats) runner.Stats {
 	return runner.Stats{
-		Candidates:         a.Candidates + b.Candidates,
-		Summarized:         a.Summarized + b.Summarized,
-		SkippedSeen:        a.SkippedSeen + b.SkippedSeen,
-		SkippedNoText:      a.SkippedNoText + b.SkippedNoText,
-		SkippedManual:      a.SkippedManual + b.SkippedManual,
-		SkippedTooOld:      a.SkippedTooOld + b.SkippedTooOld,
-		SkippedRateLimited: a.SkippedRateLimited + b.SkippedRateLimited,
-		ChannelUnavailable: a.ChannelUnavailable + b.ChannelUnavailable,
-		Errors:             a.Errors + b.Errors,
+		Candidates:              a.Candidates + b.Candidates,
+		Summarized:              a.Summarized + b.Summarized,
+		SkippedSeen:             a.SkippedSeen + b.SkippedSeen,
+		SkippedNoText:           a.SkippedNoText + b.SkippedNoText,
+		SkippedManual:           a.SkippedManual + b.SkippedManual,
+		SkippedTooOld:           a.SkippedTooOld + b.SkippedTooOld,
+		SkippedRateLimited:      a.SkippedRateLimited + b.SkippedRateLimited,
+		SkippedNoCaptionChannel: a.SkippedNoCaptionChannel + b.SkippedNoCaptionChannel,
+		ChannelUnavailable:      a.ChannelUnavailable + b.ChannelUnavailable,
+		Errors:                  a.Errors + b.Errors,
 	}
 }

cmd/tapir/scheduler_test.go

@@ -11,8 +11,8 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/runner"
 )
 
 func quietLog() *slog.Logger {
@@ -45,6 +45,7 @@ func (f fakeLister) ConnectionsForUser(_ context.Context, userID string) ([]stor
 type countingRunUser struct {
 	mu      sync.Mutex
 	calls   map[string]int
+	order   []string // userIDs in the order they were run, across all passes
 	failFor map[string]bool
 }
 
@@ -60,12 +61,19 @@ func (c *countingRunUser) run(_ context.Context, userID string) (runner.Stats, e
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	c.calls[userID]++
+	c.order = append(c.order, userID)
 	if c.failFor[userID] {
 		return runner.Stats{Errors: 1}, errors.New("boom")
 	}
 	return runner.Stats{Summarized: 1}, nil
 }
 
+func (c *countingRunUser) runOrder() []string {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return append([]string(nil), c.order...)
+}
+
 func (c *countingRunUser) count(userID string) int {
 	c.mu.Lock()
 	defer c.mu.Unlock()
@@ -94,7 +102,7 @@ func TestDiscoveryPassRunsEveryUserOnce(t *testing.T) {
 	lister := fakeLister{users: usersN("a", "b", "c")}
 	rc := newCountingRunUser()
 
-	stats := runDiscoveryPass(context.Background(), lister, rc.run, quietLog())
+	stats := runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
 
 	require.Equal(t, 1, rc.count("a"))
 	require.Equal(t, 1, rc.count("b"))
@@ -102,13 +110,46 @@ func TestDiscoveryPassRunsEveryUserOnce(t *testing.T) {
 	require.Equal(t, 3, stats.Summarized, "stats are summed across users")
 }
 
+// Caption fetches share one per-IP budget; a fixed user order starves whoever is
+// last. Each pass must rotate which user leads so the lead slot is shared.
+func TestDiscoveryPassRotatesLeadUser(t *testing.T) {
+	lister := fakeLister{users: usersN("a", "b", "c")}
+	rc := newCountingRunUser()
+
+	runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
+	runDiscoveryPass(context.Background(), 1, lister, rc.run, quietLog())
+	runDiscoveryPass(context.Background(), 2, lister, rc.run, quietLog())
+
+	require.Equal(t, []string{"a", "b", "c", "b", "c", "a", "c", "a", "b"}, rc.runOrder(),
+		"each pass left-rotates the user order so every user leads in turn")
+	// Fairness: over a full rotation cycle every user ran the same number of times.
+	require.Equal(t, 3, rc.count("a"))
+	require.Equal(t, 3, rc.count("b"))
+	require.Equal(t, 3, rc.count("c"))
+}
+
+// A connectionless orphan must not consume a rotation slot: rotation is over the
+// connected users only, so two real users alternate the lead 50/50 even with a
+// dead identity listed between them.
+func TestDiscoveryPassRotationIgnoresConnectionlessUsers(t *testing.T) {
+	lister := fakeLister{users: usersN("a", "orphan", "c"), noConn: map[string]bool{"orphan": true}}
+	rc := newCountingRunUser()
+
+	runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
+	runDiscoveryPass(context.Background(), 1, lister, rc.run, quietLog())
+
+	require.Equal(t, []string{"a", "c", "c", "a"}, rc.runOrder(),
+		"only connected users rotate; the orphan never runs and never holds a slot")
+	require.Equal(t, 0, rc.count("orphan"))
+}
+
 func TestDiscoveryPassSkipsUsersWithoutConnections(t *testing.T) {
 	// b never connected a video source (e.g. a stale Dex-era orphan identity).
 	// It must be skipped silently — not run and logged as a token error every pass.
 	lister := fakeLister{users: usersN("a", "b", "c"), noConn: map[string]bool{"b": true}}
 	rc := newCountingRunUser()
 
-	stats := runDiscoveryPass(context.Background(), lister, rc.run, quietLog())
+	stats := runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
 
 	require.Equal(t, 1, rc.count("a"))
 	require.Equal(t, 0, rc.count("b"), "a user with no connection must be skipped, not run")
@@ -121,7 +162,7 @@ func TestDiscoveryPassOneUserFailureDoesNotStopOthers(t *testing.T) {
 	lister := fakeLister{users: usersN("a", "b", "c")}
 	rc := newCountingRunUser("b") // user b's pass errors
 
-	stats := runDiscoveryPass(context.Background(), lister, rc.run, quietLog())
+	stats := runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
 
 	require.Equal(t, 1, rc.count("a"))
 	require.Equal(t, 1, rc.count("b"))
@@ -134,7 +175,7 @@ func TestDiscoveryPassListerErrorIsContained(t *testing.T) {
 	lister := fakeLister{err: errors.New("db down")}
 	rc := newCountingRunUser()
 
-	stats := runDiscoveryPass(context.Background(), lister, rc.run, quietLog())
+	stats := runDiscoveryPass(context.Background(), 0, lister, rc.run, quietLog())
 
 	require.Equal(t, 0, rc.total(), "no users enumerated → no passes")
 	require.Equal(t, runner.Stats{}, stats)

cmd/tapir/show.go

@@ -8,7 +8,7 @@ import (
 	"os"
 	"strings"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // runShow prints the full summary for one video: text, highlights, takeaways,

docs/architecture/architecture.md

@@ -250,6 +250,32 @@ After  (newest-first):       `[chanB-new, chanA-mid, chanA-old, chanB-null]`
 The set of *processed* videos now also excludes auto-mode back-catalogue beyond the recency
 window (those stay listed, summarised on demand); within the processed set, only order changes.
 
+### Connect-time onboarding burst (ADR-018 → ADR-028)
+
+On a successful YouTube connect, `ConnectHandler` enqueues a connect-triggered discovery pass;
+the `discoveryTrigger` runs that pass and then fires the **onboarding burst** — a third entry path
+that summarises up to `TAPIR_ONBOARD_SUMMARIZE_COUNT` (default 3, hard-capped) of the new user's
+videos so the first session is not empty. The burst still flows through `globalFetchGate` (it is
+not a throughput change); ADR-028 sharpened *which* videos and *which model*:
+
+- **Selection** is `OnboardBurstVideoIDs`, not pure newest-first. It keeps newest-first order but
+  excludes a video whose **known** duration is outside `[TAPIR_MIN_VIDEO_SECONDS,
+  TAPIR_ONBOARD_MAX_VIDEO_SECONDS]` (drops Shorts and multi-hour livestream VODs). An unknown
+  (NULL) duration is degrade-open — kept, but ranked after known-good rows. The connect-triggered
+  discovery pass runs *before* the burst, and ADR-023's `videos.list` enrichment now **persists**
+  `duration_s` (instead of discarding it after the Shorts filter), so a fresh user's candidates
+  carry a duration in time for selection.
+- **Model**: the burst runs through a dedicated summarizer chain led by
+  `TAPIR_ONBOARD_SUMMARIZER_MODEL` (default `iguana/gemma4-26b`, the stronger local model), with
+  the standard ADR-022 chain following as fallback. This is a wiring choice — a second
+  `engineProcessor` over the same store / transcript cache / sink; the engine and ports are
+  unchanged. Empty / equal-to-primary collapses it back onto the shared processor.
+
+`has-captions` is deliberately **not** a selection signal — it is only knowable after a gate fetch
+(or a ~0-probability cache hit at pilot scale), so the burst can avoid known-junk but cannot
+promise captions. Cached-transcript-first selection was investigated and rejected (ADR-028:
+~3% cross-user overlap).
+
 ---
 
 ## Sequence — core use case: new video summarized

docs/data-model.md

@@ -10,12 +10,15 @@ only opaque references to them; the secret material lives in ESO/1Password (ADR-
 
 ## Design decisions baked into this model
 
-- **Per-user isolation, not a shared global video table.** The earlier draft proposed a
-  global `videos`/`transcripts` table deduped across tenants. Rejected for Future B: it
-  reintroduces exactly the cross-domain coupling the homelab architecture review is
-  removing, and at 1–5 users the cost of occasionally re-summarizing the same video is
-  trivial compared to the isolation it would cost. Each user's data is self-contained.
-  (Revisit only if Future C makes GPU/transcription cost dominate — a new ADR, not a default.)
+- **Per-user isolation for everything except transcripts.** The earlier draft proposed a
+  global `videos`/`transcripts` table deduped across tenants. **Videos** stay per-user and
+  RLS-scoped — a shared video table reintroduces exactly the cross-domain coupling the homelab
+  architecture review is removing. **Transcripts**, however, are now shared (ADR-021): keyed by
+  `(provider, provider_video_id)`, no `user_id`, **not** RLS-scoped. The cost avoided there is
+  not LLM re-summarization but a rate-gated, reputation-risky caption fetch (ADR-010/014), which
+  is paid per re-fetch regardless of user count — so persisting public caption content once and
+  sharing it strictly beats the coupling it removes. Everything else each user owns is
+  self-contained; `rls_test.go` proves transcripts is the single exception.
 - **Secrets by reference only.** Tables hold a `secret_ref` (opaque string/UUID resolved via
   the `SecretStore` port), never tokens or keys.
 - **The brain sink is just a delivery target.** No brain-specific tables. Whether a summary
@@ -34,7 +37,7 @@ erDiagram
     USER ||--o{ AI_CREDENTIAL : "has (planned)"
     VIDEO_CONNECTION ||--o{ SUBSCRIPTION : "exposes (planned)"
     SUBSCRIPTION ||--o{ VIDEO : "produces (per user)"
-    VIDEO ||--o| TRANSCRIPT : "has at most one"
+    VIDEO }o--o| TRANSCRIPT : "shares one by (provider, provider_video_id) — not FK (ADR-021)"
     VIDEO ||--o| SUMMARY : "has at most one"
     SUMMARY ||--o{ SINK_DELIVERY : "delivered via"
     USER ||--o{ CHANNEL_ERROR : "reports unavailable channels"
@@ -92,12 +95,12 @@ erDiagram
         timestamptz rate_limited_at "backoff clock for 429 retries (migration 007)"
     }
     TRANSCRIPT {
-        uuid video_id PK_FK
-        uuid user_id FK
+        text provider PK "part of shared key (ADR-021)"
+        text provider_video_id PK "part of shared key — the cross-user dedup key"
         text source "captions | none"
         text language
         text content "null when source = none"
-        timestamptz resolved_at
+        timestamptz fetched_at
     }
     SUMMARY {
         uuid id PK
@@ -173,8 +176,12 @@ mechanism.
   `transcript_status` and `rate_limited_at` (migration 007) track caption-fetch outcomes for
   rate-limit backoff: `NULL` = not attempted; `rate_limited` = 429 seen, skip until
   `NOW() - rate_limited_at > TAPIR_FETCH_BACKOFF`; `fetched` = resolved; `none` = no transcript.
-- **TRANSCRIPT** — at most one per video. `source = none` records "checked, no usable
-  transcript" so the watcher doesn't reprocess (ADR-007). `content` null in that case.
+- **TRANSCRIPT** — shared public caption content, one row per `(provider, provider_video_id)`,
+  **not** RLS-scoped and carrying no `user_id` (ADR-021). Two users who watch the same video
+  share the one row; the summarize path reads it before any caption fetch, so re-analysis never
+  re-touches YouTube (ADR-010/014). `source = none` records "checked, no usable transcript" so
+  no one reprocesses (ADR-007); `content` null in that case. A transient 429 is never stored
+  here — it stays a per-user retry via `VIDEO.transcript_status`.
 - **SUMMARY** — at most one per video. `fallback_used` + `ai_provider`/`ai_model` make the
   "is local good enough?" question queryable (the Stage 0 quality signal). `highlights`/
   `takeaways` as jsonb to stay schema-flexible while the output format settles.
@@ -231,7 +238,8 @@ queue, doesn't replace it). Deferred until there's a reason.
 
 ## Explicitly out of scope (Future C)
 
-- Global cross-tenant video/transcript dedup (rejected above).
+- Global cross-tenant *video* dedup (rejected above). Note: cross-tenant *transcript* sharing
+  is now in scope and shipped (ADR-021); only the videos half stays per-user.
 - Sharding / per-tenant physical databases.
 - Soft-delete + full audit trail on connections/credentials (a Stage 2 hardening item; add
   via ADR when Stage 2 work starts).

docs/homelab-integration.md

@@ -27,6 +27,30 @@ it** — endpoints and aliases drift, and this file is a snapshot (2026-06-06),
   `iguana/deepseek-r1-14b`) is preferred for summary quality if its latency/output is acceptable.
   The `max_tokens` fix below means thinking models no longer return empty content, so they are now
   viable choices, not blocked ones. Do not assume a coder alias is right for prose.
+- **Summarizer fallback chain (ADR-022).** The primary alias is the *first* of an ordered chain;
+  on failure or unparseable output the summarizer advances to the next model. All reached through
+  the same gateway by alias.
+  - `TAPIR_FALLBACK_MODEL` — local fallback. **Default `iguana/gemma4-26b`** — on iguana, NOT
+    koala, so the fallback does not compete with koala's other GPU loads (and runs from a different
+    egress IP). Empty disables it.
+  - `TAPIR_CLOUD_FALLBACK_MODEL` — worst-case EXTERNAL fallback. **Default `berget/mistral-small`.**
+    **Set this empty (`""`) for any client/NDA deployment** so content never leaves the local
+    stack — the chain then contains only local endpoints.
+  - `TAPIR_SUMMARY_MAX_TOKENS` — per-summary completion budget. **Default `1500`.** Small on
+    purpose: with the old 8192 budget, prompt + completion overflowed `phi4-mini`'s 8k window.
+  - `TAPIR_MAX_TRANSCRIPT_CHARS` — transcript truncation budget sent to the model. **Default
+    `18000`** (~fits an 8k-context model). `0` disables truncation. Prevents the context-overflow
+    HTTP 400 a long transcript caused on `phi4-mini`.
+- **Discovery low-value filter (ADR-023).** `TAPIR_MIN_VIDEO_SECONDS` — **default `60`**. At
+  discovery, `NewVideos` enriches candidates with one cheap `videos.list` call (quota API, NOT
+  the timedtext 429 path) and drops videos shorter than this plus any live/upcoming broadcast,
+  so the scarce caption-fetch budget isn't spent on Shorts. `0` disables the filter. The
+  paste-a-URL path is never filtered.
+- **Per-channel caption memory (ADR-024).** `TAPIR_CHANNEL_CAPTIONLESS_THRESHOLD` — **default
+  `5`** consecutive no-caption results before a channel is suppressed (its videos listed but not
+  caption-fetched). `TAPIR_CHANNEL_CAPTIONLESS_WINDOW` — **default `336h`** (14d) suppression
+  before one video is re-probed. `THRESHOLD=0` disables. A successful fetch resets the channel;
+  a 429 does not count; an explicit manual request bypasses suppression.
 - **Thinking models need an explicit `max_tokens`.** qwen3 / deepseek-r1 spend the budget on
   reasoning and return **empty content** if `max_tokens` is too low (or unset). The summarizer's
   parser treats an empty summary as an error for exactly this reason. **Done (2026-06-02, Worker F):**
@@ -200,6 +224,15 @@ knobs plus one load-bearing deployment constraint:
 - `TAPIR_DISCOVERY_INTERVAL` — Go duration, e.g. `2h`. The cadence the serve process runs a
   discovery pass for every registered user (run-once-on-startup, then every interval).
   **Unset or `0` = disabled** (dev/tests never auto-fetch).
+- `TAPIR_USAGE_GATE_START` — `YYYY-MM-DD`, default **`2026-06-11`** (the morning the pilot was
+  unblocked and summaries started flowing). `tapir report` counts return-usage (distinct active
+  weeks, ADR-016) only from this date, so pre-launch testing and the blocked period are excluded.
+- `TAPIR_METRICS_ADDR` — listen address for the Prometheus `/metrics` endpoint (ADR-030).
+  **Default `:9090`** — a SEPARATE port from `TAPIR_HTTP_ADDR` so metrics are never on the public
+  app; scraped in-cluster only (PodMonitor). Empty disables the metrics server. Key series:
+  `tapir_summarize_duration_seconds{model,outcome,fallback}`, `tapir_caption_fetch_duration_seconds{outcome}`,
+  `tapir_chat_duration_seconds{model}`, `tapir_llm_tokens_total{model,kind}`,
+  `tapir_http_request_duration_seconds{method,route}`, `tapir_logins_total`.
 - `TAPIR_FETCH_RATE` — Go duration, default `2s`. The **process-wide per-egress-IP caption-fetch
   rate gate** (ADR-014 item 2). Every caption fetch — scheduler runners *and* the web "Summarize"
   click-path — serialises through this one limiter so the pod cannot collectively trip 429s. `0`

docs/sketches/a-tui-panels.html

@@ -0,0 +1,63 @@
+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>tapir — A · TUI panels</title>
+<style>
+:root{--bg:#0d0d12;--panel:#14141c;--line:#2a2a3a;--mint:#0EF9B6;--pink:#F740A0;--purple:#7653fc;--cream:#F5E9D6;--dim:#6b6b86;--text:#d9d9e6}
+*{box-sizing:border-box}
+body{margin:0;background:var(--bg);color:var(--text);font:14px/1.5 ui-monospace,SFMono-Regular,Menlo,"Cascadia Code",monospace}
+.wrap{max-width:760px;margin:0 auto;padding:18px 14px 60px}
+header{display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:18px}
+.brand{color:var(--mint);font-weight:700;letter-spacing:.5px}
+.brand b{color:var(--cream)}
+.tip{margin-left:auto;color:var(--dim);font-size:12px}
+.note{color:var(--dim);font-size:12.5px;border-left:2px solid var(--purple);padding:6px 10px;margin:0 0 16px;background:#11111a}
+/* lipgloss-style bordered panel */
+.card{border:1px solid var(--line);border-radius:8px;background:var(--panel);padding:12px 14px;margin:0 0 12px;position:relative}
+.card::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--purple)}
+.card.ready::before{background:var(--mint)}
+.title{color:var(--cream);font-size:15px;font-weight:600;margin:0 0 4px}
+.meta{color:var(--dim);font-size:12px}
+.chip{display:inline-block;border:1px solid var(--mint);color:var(--mint);border-radius:4px;padding:0 6px;font-size:11px;margin-left:6px}
+.chip.q{border-color:var(--pink);color:var(--pink)}
+.preview{color:var(--dim);margin:6px 0 0;font-size:13px}
+/* expanded */
+.exp{border-color:var(--purple)}
+.exp .head{display:flex;justify-content:space-between;align-items:baseline}
+.collapse{color:var(--mint);font-size:12px;text-decoration:none;border:1px solid var(--line);border-radius:4px;padding:1px 7px}
+.sec h2{color:var(--mint);font-size:12px;text-transform:uppercase;letter-spacing:1px;margin:16px 0 6px;border-bottom:1px dashed var(--line);padding-bottom:3px}
+.sec ul{margin:0;padding-left:18px}.sec li{margin:3px 0}
+.body{color:var(--text)}
+.dock{margin-top:16px;border-top:1px solid var(--line);padding-top:12px}
+.ask{display:inline-block;background:linear-gradient(90deg,var(--purple),var(--pink));color:#fff;border:0;border-radius:6px;padding:7px 12px;font:inherit;font-size:13px;cursor:pointer}
+pre.tapir{margin:0;color:var(--mint);font-size:10px;line-height:1.05}
+</style></head><body><div class="wrap">
+<header>
+  <pre class="tapir">  ▄█▓▓█▄  ∩
+ █▓( ◕ ◕ )▓█──┘</pre>
+  <span class="brand">◆ <b>tapir</b> · watch less, know more</span>
+  <span class="tip">261 in queue</span>
+</header>
+<p class="note">Tapir fetches captions slowly on purpose, to respect YouTube's limits — new summaries land gradually.</p>
+
+<div class="card ready"><div class="title">How the Attention Economy Rewires Your Brain</div>
+<div class="meta">youtube · 2026-06-11 · 18 min <span class="chip">ready</span></div>
+<div class="preview">A tour of the incentive loops behind infinite feeds and three concrete ways to claw back focus…</div></div>
+
+<article class="card exp ready">
+  <div class="head"><div class="title">Postgres 18 — What's Actually New</div><a class="collapse" href="#">collapse ↑</a></div>
+  <div class="meta">youtube · 2026-06-10 · 42 min · phi4-mini</div>
+  <div class="sec"><h2>Takeaways</h2><ul>
+    <li>Async I/O cuts cold-cache read latency materially on NVMe.</li>
+    <li>Skip-scan makes more multicolumn indexes usable without rewrites.</li>
+    <li>Upgrade path is smooth; test the new planner stats first.</li></ul></div>
+  <div class="sec"><h2>Highlights</h2><ul>
+    <li>Async I/O subsystem (effective_io_concurrency now matters more).</li>
+    <li>B-tree skip scan for leading-column gaps.</li>
+    <li>Better partition-wise joins.</li></ul></div>
+  <div class="sec"><h2>Summary</h2><p class="body">Postgres 18 is an incremental but meaningful release: the headline is the new asynchronous I/O path, with skip-scan and planner improvements close behind. For most homelabs the upgrade is low-risk and worth it for the read-latency wins.</p></div>
+  <div class="dock"><button class="ask">Dig deeper — ask about this video →</button></div>
+</article>
+
+<div class="card"><div class="title">RAG is dead, right?? — Conference Talk</div>
+<div class="meta">youtube · 2026-06-09 · 31 min <span class="chip q">queued</span></div></div>
+</div></body></html>

docs/sketches/b-reader-charm.html

@@ -0,0 +1,62 @@
+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>tapir — B · reader + charm accents</title>
+<style>
+:root{--bg:#faf7f2;--card:#fff;--ink:#1c1b22;--soft:#6a6878;--line:#e7e2d8;--mint:#0bbf8c;--purple:#6a4cf0;--pink:#e0379a}
+*{box-sizing:border-box}
+body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,sans-serif}
+.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
+.wrap{max-width:680px;margin:0 auto;padding:20px 16px 60px}
+header{display:flex;align-items:center;gap:10px;margin-bottom:18px}
+.brand{font-weight:800;font-size:18px;letter-spacing:-.3px}
+.brand .dot{color:var(--mint)}
+.tag{color:var(--soft);font-size:13px}
+.tip{margin-left:auto;color:var(--soft);font-size:12px}
+.note{color:var(--soft);font-size:13px;background:#fff;border:1px solid var(--line);border-left:3px solid var(--mint);border-radius:8px;padding:8px 12px;margin:0 0 18px}
+.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:0 0 14px;box-shadow:0 1px 2px rgba(20,18,40,.04)}
+.title{font-size:18px;font-weight:700;letter-spacing:-.2px;margin:0 0 4px;line-height:1.3}
+.meta{color:var(--soft);font-size:13px}
+.meta .mono{font-size:12.5px}
+.chip{display:inline-block;background:rgba(11,191,140,.12);color:var(--mint);border-radius:999px;padding:1px 9px;font-size:12px;font-weight:600;margin-left:6px}
+.chip.q{background:rgba(224,55,154,.12);color:var(--pink)}
+.preview{color:var(--soft);margin:8px 0 0}
+.exp{border-color:#d9d0ee;box-shadow:0 6px 24px rgba(106,76,240,.10)}
+.head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
+.collapse{color:var(--purple);font-size:13px;font-weight:600;text-decoration:none;white-space:nowrap}
+.sec h2{font-size:12px;text-transform:uppercase;letter-spacing:1.2px;color:var(--purple);margin:18px 0 6px}
+.sec ul{margin:0;padding-left:20px}.sec li{margin:5px 0}
+.body{line-height:1.7}
+.dock{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}
+.ask{display:inline-flex;align-items:center;gap:6px;background:var(--ink);color:#fff;border:0;border-radius:999px;padding:9px 16px;font:inherit;font-size:14px;font-weight:600;cursor:pointer}
+pre.tapir{margin:0;color:var(--mint);font-size:10px;line-height:1.05}
+</style></head><body><div class="wrap">
+<header>
+  <pre class="tapir">  ▄█▓▓█▄  ∩
+ █▓( ◕ ◕ )▓█──┘</pre>
+  <span class="brand">tapir<span class="dot">.</span></span><span class="tag">watch less, know more</span>
+  <span class="tip mono">261 in queue</span>
+</header>
+<p class="note">Tapir fetches captions slowly on purpose, to respect YouTube's limits — new summaries land gradually.</p>
+
+<div class="card"><div class="title">How the Attention Economy Rewires Your Brain</div>
+<div class="meta mono">youtube · 2026-06-11 · 18 min <span class="chip">ready</span></div>
+<div class="preview">A tour of the incentive loops behind infinite feeds and three concrete ways to claw back focus…</div></div>
+
+<article class="card exp">
+  <div class="head"><div class="title">Postgres 18 — What's Actually New</div><a class="collapse" href="#">collapse ↑</a></div>
+  <div class="meta mono">youtube · 2026-06-10 · 42 min · phi4-mini</div>
+  <div class="sec"><h2>Takeaways</h2><ul>
+    <li>Async I/O cuts cold-cache read latency materially on NVMe.</li>
+    <li>Skip-scan makes more multicolumn indexes usable without rewrites.</li>
+    <li>Upgrade path is smooth; test the new planner stats first.</li></ul></div>
+  <div class="sec"><h2>Highlights</h2><ul>
+    <li>Async I/O subsystem (effective_io_concurrency now matters more).</li>
+    <li>B-tree skip scan for leading-column gaps.</li>
+    <li>Better partition-wise joins.</li></ul></div>
+  <div class="sec"><h2>Summary</h2><p class="body">Postgres 18 is an incremental but meaningful release: the headline is the new asynchronous I/O path, with skip-scan and planner improvements close behind. For most homelabs the upgrade is low-risk and worth it for the read-latency wins.</p></div>
+  <div class="dock"><button class="ask">✦ Ask about this video</button></div>
+</article>
+
+<div class="card"><div class="title">RAG is dead, right?? — Conference Talk</div>
+<div class="meta mono">youtube · 2026-06-09 · 31 min <span class="chip q">queued</span></div></div>
+</div></body></html>

docs/sketches/c-cozy-terminal.html

@@ -0,0 +1,65 @@
+<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>tapir — C · cozy terminal</title>
+<style>
+:root{--bg:#16131d;--card:#1e1a28;--ink:#ece7f5;--soft:#9a92b4;--line:#322b44;--mint:#2ee6b6;--purple:#9d7bff;--pink:#ff6bdb;--cream:#f3ead8}
+*{box-sizing:border-box}
+body{margin:0;background:radial-gradient(1200px 600px at 70% -10%,#231b33,transparent),var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,sans-serif}
+.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
+.wrap{max-width:700px;margin:0 auto;padding:20px 16px 60px}
+header{display:flex;align-items:center;gap:12px;margin-bottom:18px}
+.brand{font-weight:800;font-size:18px}.brand .c{color:var(--mint)}
+.tag{color:var(--soft);font-size:13px}
+.tip{margin-left:auto;color:var(--soft);font-size:12px}
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+.note b{color:var(--mint);font-weight:600}
+.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px 14px 18px;margin:0 0 13px;overflow:hidden}
+.card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--purple)}
+.card.ready::before{background:linear-gradient(var(--mint),var(--purple))}
+.title{font-size:16px;font-weight:700;margin:0 0 4px;color:var(--cream)}
+.meta{color:var(--soft);font-size:12.5px}
+.chip{display:inline-block;border-radius:999px;padding:1px 9px;font-size:11px;font-weight:600;margin-left:6px;background:rgba(46,230,182,.14);color:var(--mint)}
+.chip.q{background:rgba(157,123,255,.18);color:var(--purple)}
+.preview{color:var(--soft);margin:7px 0 0;font-size:14px}
+.exp{border-color:#473a63;box-shadow:0 10px 40px rgba(0,0,0,.35)}
+.head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
+.collapse{color:var(--mint);font-size:12px;text-decoration:none;border:1px solid var(--line);border-radius:6px;padding:2px 8px;white-space:nowrap}
+.sec h2{font-size:11px;text-transform:uppercase;letter-spacing:1.3px;color:var(--mint);margin:18px 0 7px;display:flex;align-items:center;gap:8px}
+.sec h2::after{content:"";flex:1;height:1px;background:var(--line)}
+.sec ul{margin:0;padding-left:18px}.sec li{margin:5px 0}
+.body{line-height:1.7;color:var(--ink)}
+.dock{margin-top:18px;border-top:1px dashed var(--line);padding-top:14px;display:flex;align-items:center;gap:10px}
+.ask{display:inline-flex;align-items:center;gap:7px;background:linear-gradient(90deg,var(--purple),var(--mint));color:#10101a;border:0;border-radius:999px;padding:9px 16px;font:inherit;font-weight:700;font-size:14px;cursor:pointer}
+.dockhint{color:var(--soft);font-size:12px}
+pre.tapir{margin:0;color:var(--mint);font-size:11px;line-height:1.05}
+</style></head><body><div class="wrap">
+<header>
+  <pre class="tapir">  ▄█▓▓█▄  ∩
+ █▓( ◕ ◕ )▓█──┘</pre>
+  <span class="brand">tapir<span class="c">_</span></span><span class="tag">watch less, know more</span>
+  <span class="tip mono">261 in queue</span>
+</header>
+<p class="note">Tapir fetches captions slowly on purpose, to respect YouTube's limits — <b>new summaries land gradually</b>.</p>
+
+<div class="card ready"><div class="title">How the Attention Economy Rewires Your Brain</div>
+<div class="meta mono">youtube · 2026-06-11 · 18 min <span class="chip">ready</span></div>
+<div class="preview">A tour of the incentive loops behind infinite feeds and three concrete ways to claw back focus…</div></div>
+
+<article class="card exp ready">
+  <div class="head"><div class="title">Postgres 18 — What's Actually New</div><a class="collapse" href="#">collapse ↑</a></div>
+  <div class="meta mono">youtube · 2026-06-10 · 42 min · phi4-mini</div>
+  <div class="sec"><h2>Takeaways</h2><ul>
+    <li>Async I/O cuts cold-cache read latency materially on NVMe.</li>
+    <li>Skip-scan makes more multicolumn indexes usable without rewrites.</li>
+    <li>Upgrade path is smooth; test the new planner stats first.</li></ul></div>
+  <div class="sec"><h2>Highlights</h2><ul>
+    <li>Async I/O subsystem (effective_io_concurrency now matters more).</li>
+    <li>B-tree skip scan for leading-column gaps.</li>
+    <li>Better partition-wise joins.</li></ul></div>
+  <div class="sec"><h2>Summary</h2><p class="body">Postgres 18 is an incremental but meaningful release: the headline is the new asynchronous I/O path, with skip-scan and planner improvements close behind. For most homelabs the upgrade is low-risk and worth it for the read-latency wins.</p></div>
+  <div class="dock"><button class="ask">◆ Ask about this video</button><span class="dockhint mono">answers only from this video's transcript</span></div>
+</article>
+
+<div class="card"><div class="title">RAG is dead, right?? — Conference Talk</div>
+<div class="meta mono">youtube · 2026-06-09 · 31 min <span class="chip q">queued</span></div></div>
+</div></body></html>

docs/specs/chat-with-transcript.md

@@ -0,0 +1,89 @@
+# Spec — Chat with a video's stored transcript (ADR-027)
+
+**Repo:** tapir · **Size:** medium · **Solo session.** Implements ADR-027. Read CLAUDE.md,
+DECISIONS.md (ADR-021 transcript store, ADR-022 model chain, ADR-012 isolation, ADR-027), and
+`docs/ui-spec.md` first. TBD, conventional commits, `task check` green per commit, `templ
+generate` after view changes.
+
+## FIRST: append ADR-027 to DECISIONS.md
+ADR-027 text is provided separately (planning thread). Insert immediately before the
+`## Rejected alternatives` heading, as the first commit, so the decision precedes the build.
+
+## What this is
+A per-video chat letting the user ask questions against a video's **already-stored** transcript,
+entered from the summary view. Born from observed demand: the maintainer read real summaries and
+some made him want to dig deeper — this gives that "I want more" reaction somewhere to go, without
+watching the video.
+
+## HARD CONSTRAINT — stored-transcript-only (the safety property)
+Chat is available **ONLY** for videos that already have a stored transcript (ADR-021). It must
+**never** trigger a caption fetch, never touch the rate gate, never reach YouTube. Entry being
+"from a summarized video" guarantees the transcript exists. If somehow invoked on a video with no
+stored transcript → show "transcript not available for chat", NO fetch. This is what makes the
+feature safe by construction; do not add an on-demand-fetch path (explicitly deferred).
+
+## 1. Entry point
+- A "Dig deeper" / "Ask about this" affordance on the **summary view** of a summarized video
+  (not the list cards — the detail/summary page). Quiet, consistent with the existing card-state
+  styling.
+- Opens a chat panel/view scoped to that one video, with its stored transcript as context.
+
+## 2. The chat
+- Read the stored transcript for the video (via the ADR-021 `TranscriptStore`, keyed by
+  `(provider, provider_video_id)`). No fetch.
+- Send transcript + the user's question + minimal system framing to the chosen model via the
+  **existing LiteLLM gateway** (the same client the summarizer uses — a chat is a different
+  call, not a new integration).
+- Stream or return the answer; render in the chat panel. HTMX/no-JS ethos — match the existing
+  app (the summarize status uses HTMX polling; chat can use a simple POST-and-render or HTMX
+  streaming if clean).
+- **Transcript truncation:** reuse/respect `TAPIR_MAX_TRANSCRIPT_CHARS` (ADR-022) so a long
+  transcript fits the model context. If truncated, the chat should be honest that it's working
+  from a bounded portion (a quiet note), since answers about the tail of a long video may be
+  incomplete.
+
+## 3. Model selection (the instrumentation win)
+- **Default model = the model that produced this video's summary.** (Store/lookup which chain
+  model summarized it — if not already recorded, this is a small addition; if recording it is
+  non-trivial, default to the chain primary and note the gap.)
+- **User can switch** among the ADR-022 chain models (`phi4-mini`, `gemma4-26b`,
+  `mistral-small` to start) via a simple selector in the chat panel. Switching re-runs against
+  the same transcript — this is deliberate model-comparison instrumentation.
+- Respect the local-first / NDA posture: if `TAPIR_CLOUD_FALLBACK_MODEL=""` (cloud disabled),
+  the external model is NOT offered in the switcher — only local models. Chat must honor the same
+  "content stays local" guarantee as ADR-022.
+
+## 4. Ephemeral (v1)
+- No persisted chat history. Conversation lives for the session/page. No new table, no migration.
+- (Multi-turn within a session is fine — keep the running messages in the request/page state —
+  but nothing is written to the DB.)
+
+## 5. Isolation
+- The transcript is shared/non-RLS (ADR-021) — fine, it's public content. But the chat is invoked
+  by a user about a video **in their feed**; confirm the entry path is reachable only for the
+  requesting user's own videos (the summary view is already RLS-scoped). Chat adds no new
+  user-data surface (ephemeral), so there's nothing new to RLS — but the test should confirm a
+  user can only open chat from their own summary view, not arbitrary video ids.
+
+## Tests
+- Chat on a video with a stored transcript → answer returned; assert NO caption-fetch / no
+  YouTube call occurs (the safety property — this is the key assertion).
+- Chat invoked on a video with no stored transcript → honest "not available", NO fetch.
+- Model switch → re-runs against the same transcript with the selected model; cloud model absent
+  from the switcher when `TAPIR_CLOUD_FALLBACK_MODEL=""`.
+- Truncation honored for a long transcript; the bounded-context note shows.
+- Entry is reachable only from the user's own summary view (isolation).
+
+## Out of scope / deferred (record, don't build)
+- **Persisted chat history** (per-user, RLS-scoped) — deferred until evidence anyone revisits a
+  conversation.
+- **Show-source / transcript-verification UI** — the natural v2 (ADR-027 records it); v1 is
+  chat-only/trust-the-model. ADR-021's stored transcript makes v2 cheap when wanted.
+- **On-demand fetch** for un-stored videos — would reintroduce the caption-fetch surface the
+  stored-only constraint removes. Not now.
+- Anything that nudges the user to return (ADR-020 — gate contamination).
+
+## Boundaries
+Stored-transcript-only (HARD). No rate-gate/fetch surface. No auth changes. No new persisted
+state in v1. Reuse the existing gateway client + truncation config; don't build a new model
+integration.

docs/specs/onboarding-wow-burst.md

@@ -0,0 +1,128 @@
+# Spec — Onboarding "wow" burst: better picks, stronger model
+
+**Repo:** tapir · **Size:** medium · **Solo session** (not a swarm).
+
+> **Status: built (v0.25.0, ADR-028).** This supersedes the original investigate-first brief
+> (committed as the prior version of this file): Phase 1 was run against the live pilot DB and its
+> findings are folded into "Why this exists" below; Phase 2 was built as described here. The one
+> brief lever NOT built — the honest "the rest fill in over the coming days" framing copy — is
+> listed under *Explicitly NOT in this slice*.
+
+**Why this exists.** A new user's first session decides whether they return (the Stage-0 gate,
+VISION.md). On connect, Tapir fires a capped burst (≤`TAPIR_ONBOARD_SUMMARIZE_COUNT`, default 3)
+that summarizes the user's newest unsummarized videos so the feed isn't empty (the burst itself
+works — wired in `cmd/tapir/discovery.go` → `cmd/tapir/main.go` `onboard`). A Phase-1
+investigation of the live pilot DB found the burst *fires* but delivers a **weak first
+impression** for two concrete reasons, and ruled out a third idea:
+
+1. **Picks are junk.** Selection is pure newest-first (`videos.NewestUnsummarizedVideoIDs`,
+   `ORDER BY published_at DESC`) with **zero quality signal**. Pilot user "Jonte"'s live burst-3
+   were a stock-ticker **livestream** + two regional news clips — the newest, not the best.
+2. **Weakest model on the first impression.** All of Jonte's summaries ran on
+   `koala/phi4-mini` (the documented weak link — ADR-022 was born from its failures). The
+   stronger, brain-validated `iguana/gemma4-26b` was never used for the burst.
+3. **Cached-first is empty at pilot scale — REJECTED.** The idea (summarize already-cached
+   transcripts instantly, zero fetch) dies on the numbers: only **11 videos** overlap between the
+   two pilot users (~3% of each library), **0** cached-and-unsummarized, and a new user's
+   newest-20 unsummarized are **20/20 NOT cached** — newest-first and cached-first are
+   structurally incompatible (fresh uploads are exactly what nobody has fetched yet). Not built.
+
+This is a **curation/latency problem for ~3 videos, NOT a throughput/429 problem** — fetching 3
+captions is nowhere near the rate limit. Nothing here fetches harder or pressures the rate gate;
+it picks the right few videos and runs a better model on them.
+
+Read `CLAUDE.md`, `DECISIONS.md` (esp. ADR-014, ADR-018, ADR-020, ADR-021, ADR-022, ADR-023,
+and the new **ADR-028**), and `VISION.md` (the Stage-0 gate) first. TBD — commit directly to
+`main`, one logical change per commit, conventional commits, `task check` green before each
+commit, `templ generate` if any view changes (none expected).
+
+## Decisions already made (do not reopen)
+- **Not a throughput change.** The caption rate gate (ADR-014) is untouched — same pacing, same
+  priority lane (ADR-026). This slice changes *which* ≤3 videos the burst spends its fetches on
+  and *which model* summarizes them, never how fast or how many.
+- **Cached-first is dropped** (ADR-028, the 3% overlap). The engine's existing read-stored-first
+  (ADR-021, `resolveTranscript`) stays — it already gives a free instant summary on the rare
+  cache hit, transparently. We do not *select* for cache hits.
+- **has-captions is not a pre-fetch signal.** It is only knowable after a gate fetch (or a cache
+  hit, ~0 for new videos). Selection can only *avoid known-junk* (Shorts/live/over-long) — it
+  cannot *guarantee* captions. The spec is honest about this: better odds, not a promise.
+- **No credentialed caption fetch** (ADR-010/ADR-026 dead end). **No client extension.**
+
+## 1. Persist `duration_s` at discovery (the enabling change)
+The `videos.duration_s` column exists (migration 001) but is **never written** — ADR-023's
+`filterLowValue` (`internal/adapters/youtube/youtube.go`) already fetches each candidate's
+duration via the cheap quota `videos.list` call, uses it to drop Shorts/live, then **discards
+it**. Stop discarding:
+- Add `DurationSeconds int` to `domain.Video`.
+- In `filterLowValue`, set `DurationSeconds` on each kept video from the `videos.list` `meta`.
+- `UpsertVideo` writes `duration_s`, **COALESCE-preserving** a known value (never overwrite a
+  real duration with 0/unknown), mirroring the `channel_title` backfill stance (migration 014).
+- No new migration — the column is already there.
+
+Consequence: a fresh user's connect-triggered discovery pass runs **before** the onboard burst
+(`Enqueue`: `run()` then `onboard()`), so duration is populated for the burst's candidates at
+connect. Existing rows backfill on their next discovery pass; until then their `duration_s` is
+NULL and treated as "unknown" (§2).
+
+## 2. Junk-avoiding burst selection
+New store method, RLS-scoped via `withUser`:
+
+```
+OnboardBurstVideoIDs(ctx, userID string, limit, minSeconds, maxSeconds int) ([]string, error)
+```
+
+- Same base as the old `NewestUnsummarizedVideoIDs`: the user's videos with no summary yet,
+  `ORDER BY published_at DESC NULLS LAST, seen_at DESC`, `LIMIT limit`.
+- **Exclude known-junk**: a row is dropped only when `duration_s IS NOT NULL` **and**
+  (`duration_s < minSeconds` OR `duration_s > maxSeconds`). A NULL duration is **unknown** — kept
+  (degrade-open: never starve the burst because metadata is missing), but ordered *after* rows
+  with a known-good duration so a freshly-enriched good pick wins when both exist.
+- `minSeconds` reuses `TAPIR_MIN_VIDEO_SECONDS` (default 60 — the Shorts floor, ADR-023).
+  `maxSeconds` is new: `TAPIR_ONBOARD_MAX_VIDEO_SECONDS` (default 14400 = 4h) — drops the
+  multi-hour livestream VODs that pass the live filter once ended.
+- `minSeconds<=0` and `maxSeconds<=0` each disable that bound (so `0/0` == the old
+  newest-first behaviour, the reversibility lever).
+- The burst switches to this method; `NewestUnsummarizedVideoIDs` is removed (fully superseded —
+  `OnboardBurstVideoIDs(., 0, 0)` is identical pure-newest behaviour).
+
+## 3. Stronger model for the burst
+The burst summarizes only ≤3 videos, so a slower, stronger model is affordable exactly here.
+- New config `TAPIR_ONBOARD_SUMMARIZER_MODEL` (default `iguana/gemma4-26b` — the brain-validated
+  homelab general-purpose model, already the ADR-022 fallback).
+- Build a **burst-specific summarizer chain** that puts the onboard model **first**, then the
+  standard chain (primary → local fallback → cloud) as resilience, deduped. Wrap it in a
+  burst-specific `engineProcessor` reusing the same store/transcript-cache/sink — a pure wiring
+  choice, engine and ports unchanged (Clean Architecture, ADR-003).
+- The `onboard` closure uses the burst processor instead of `app.Processor`.
+- **Collapse cleanly**: when `OnboardSummarizerModel` is empty or equals `SummarizerModel`, the
+  onboard path reuses `app.Processor` (no separate chain) — the reversibility lever.
+- Local-first preserved: the onboard model is a local alias; the cloud endpoint stays last in the
+  chain, so a client/NDA deployment with `TAPIR_CLOUD_FALLBACK_MODEL=""` keeps burst content
+  local too.
+
+## 4. Behaviour spec + docs
+- Add scenarios to `docs/use-cases/connect_account.feature` (the connect → burst flow): burst
+  skips a too-long/live video in favour of a reasonable-length one; burst summarizes with the
+  stronger model first. Map them in `scenarioCoverage` so `TestScenarioCoverage` stays green.
+- Update `docs/architecture/architecture.md` (the onboarding-burst section) to describe the
+  junk-avoiding selection + the burst model override.
+- ADR-028 in `DECISIONS.md` records the rationale (incl. the rejected cached-first lever).
+
+## Success criteria
+- `task check` green (fmt, vet, lint, `go test -p 1 ./...`).
+- A unit test proves `OnboardBurstVideoIDs` drops a known too-long / sub-min video and keeps a
+  good one, newest-first, RLS-scoped, unsummarized-only.
+- A test proves discovery persists `duration_s` and does not clobber it on re-upsert.
+- A test proves the burst chain leads with the onboard model (then the standard chain).
+- Config defaults + bounds tested (`OnboardMaxVideoSeconds`, `OnboardSummarizerModel`).
+- No change to the rate gate, fetch pacing, or burst cap. `0/0` + empty model == prior behaviour.
+
+## Explicitly NOT in this slice
+- Cached-first selection (rejected, ADR-028).
+- Any caption-availability *guarantee* (impossible pre-fetch).
+- **Honest "taster" framing copy** ("summaries of a few of your videos to get you started — the
+  rest fill in over the coming days"). A good lever from the original brief, but it's a UI/copy
+  change with no backend dependency; deferred to a UI pass, tracked as an issue.
+- Backfilling `duration_s` for existing rows via a migration (it backfills lazily on discovery).
+- Return-nudges / digests (ADR-020: poisons the unprompted-return signal).
+- Raising fetch throughput, multi-IP, or Whisper (out of scope; the gate is deliberate).

docs/ui-spec.md

@@ -179,4 +179,5 @@ distinguishable.
 | **"Summarize now" foreground path** | Unified quiet nudge button on actionable non-summarized cards. Five explicit card states — (1) summarized: chip + no button; (2) no captions (`transcript_status = 'none'`): "No transcript available", no button; (3) queued: "Queued" chip, no button; (4) rate-limited: "Fetching soon…" + "Summarize now" → `POST /v/{id}/retry-now` (clears `rate_limited_at`, triggers engine); (5) pending: "Not summarized" + "Summarize now" → `POST /v/{id}/summarize` (queues + triggers engine). One verb, one style (`.btn-quiet`); backend difference invisible to user. Both handlers call `ProcessVideo` through `globalFetchGate`. Rate gate respected, not bypassed — this is onboarding prioritisation. | Fast onboarding value; honest dead-end for no-captions videos (no button that fails). | `internal/web/handlers.go` (`handleRetryNow`, `handleRequestSummarize`); `internal/web/views.templ` (`VideoCard`) |
 | **Pipeline stats bar** | A one-line status bar above the video list: `N summarized · M fetching soon · K no captions`. Computed from the unfiltered row set; hidden when all videos are summarized. Gives the user a clear read on pipeline state without any interaction. | Replaces the "why is nothing happening?" confusion when most videos are pending or rate-limited. | `internal/web/view.go` (`PipelineStats`, `pipelineStats`) |
 | **Unavailable channels (account page)** | The `/account` page shows a "Unavailable channels" section when any channels returned HTTP 404 on the last discovery pass. Lists channel name, an "unavailable" badge, and the first-seen date. Data sourced from the `channel_errors` table (migration 013). | Surfaces silent failures so users know why some subscribed channels produce no new videos. | migration 013; `internal/web/account.go`; `internal/adapters/youtube/youtube.go` (`domain.ErrChannelUnavailable`) |
+| **Visual refresh — charm-reader theme + light/dark toggle (ADR-032)** | One layout in two palettes expressed as CSS custom properties: a warm "reader" light theme (sketch B) and a "cozy terminal" dark theme (sketch C). Palette is chosen in cascade order — `:root` light default, an OS-preference dark block scoped to `:root:not([data-theme])` so it only applies absent an explicit choice, and `:root[data-theme="dark"\|"light"]` set by a header toggle that outranks the media query and persists in `localStorage` (guarded; degrades to OS default). An init script in `<head>` applies the stored choice before paint (no flash). Charm touches: monospace meta lines, accent uppercase section dividers with a trailing rule, pill buttons, a lifted/accent-edged expanded card. Error/danger shades became `--err-*` tokens so they follow the theme without per-block dark overrides. Sketches kept as the design record under `docs/sketches/`. | The UI read "flat and boring"; the charm/TUI aesthetic makes it distinctive and gives a real light/dark choice rather than OS-only. | ADR-032; `docs/use-cases/visual_theme.feature`; `internal/web/visual_theme_test.go`; `internal/web/view.go` (`stylesheet`, `themeScript`), `internal/web/views.templ` (Layout/PublicLayout) |
 | **Recency window + sparse-state honesty (ADR-020)** | Supersedes the copy/sort in the rows above. Auto-summarize is bounded to videos published within `TAPIR_AUTO_SUMMARIZE_WINDOW` (~7d); older un-summarized videos collapse behind a single "Show N older videos — summarize on demand" disclosure, and caption-less videos collapse to a one-line count (not N cards). List order is now `summarized-first, published_at DESC NULLS LAST`. Copy reframed for honest scarcity: pipeline bar reads "N ready · M in queue · K no captions" (no "fetching soon"); a gradual-fill note explains the rate limit; the nudge verb is "Summarize" (not "Summarize now"); the queued card says "summarizing shortly"; the empty-connected state drops the impossible `tapir run` instruction. Detail leads with Takeaways. Filters slimmed (no date pickers; hidden when empty); watched/skipped segmented; back link on detail; empty terms checkbox removed. | Make the sparse reality legible and honest instead of implying abundance/imminence; bound auto load so the back-catalogue doesn't re-drive the caption gate. Never fetch harder — scarcity is surfaced, not engineered around. | ADR-020; `2384c47`, `3df0459`, `40b703e`, `a1a5217`, `4a0a56e`, `9bf1c31`, `980638d`, `12fb031`, `f775441`, `51aa5d9` |

docs/use-cases/ai_routing.feature

@@ -31,5 +31,17 @@ Feature: Local-first AI with optional BYO fallback
     When any transcript is summarized
     Then my content is only ever sent to the local AI stack
 
-  # "Reliably" is operationalized as: Primary returned without error within timeout.
+  Scenario: A model returns unparseable output and the next endpoint succeeds
+    Given the local AI stack is available
+    But the primary model returns output that cannot be parsed into a summary
+    And a fallback model is configured
+    When a transcript is summarized
+    Then Tapir falls back to the next model in the chain
+    And the summary records fallback_used as true
+
+  # "Reliably" is operationalized as: an endpoint returned a PARSEABLE summary
+  # within timeout. A 200 with malformed JSON (or highlights emitted as a bare
+  # string) counts as a failure and advances the chain (ADR-022). Endpoints are
+  # tried in order, locals first, so the external worst-case model only ever sees
+  # content after every local endpoint has failed.
   # Quality scoring may be added later without changing these scenarios.

docs/use-cases/chat_transcript.feature

@@ -0,0 +1,69 @@
+Feature: Chat with a video's stored transcript
+  As a reader whose summary made me want to dig deeper
+  I want to ask questions about the video without watching it
+  So that I can go further on the ones worth it, without leaving the reader
+
+  # ADR-027. The load-bearing constraint is safety-by-construction: chat runs
+  # ONLY against an already-stored transcript (ADR-021) and never fetches captions,
+  # never touches the rate gate, never reaches YouTube. Entry is from the summary
+  # view of one's OWN video; the conversation is ephemeral (no persisted history).
+
+  Background:
+    Given I have a summarized video with a stored transcript
+
+  Scenario: A summary view offers a deeper-dive into the video
+    When I view the summary
+    Then I see a "dig deeper" affordance that opens a chat about this video
+    And it opens the chat in place, below the summary, without leaving the page
+
+  Scenario: The summary and the chat are on one page
+    When I open the chat
+    Then the summary stays visible alongside the chat
+    And I can read the summary while I ask questions
+
+  Scenario: Ask a question answered from the stored transcript
+    When I ask a question in the chat
+    Then the answer is produced from the stored transcript
+    And no caption fetch and no YouTube call occurs
+
+  Scenario: Chat never fetches captions or reaches YouTube
+    When I ask a question in the chat
+    Then Tapir reads only the stored transcript
+    And the caption-fetch and video-fetch paths are never invoked
+
+  Scenario: A video with no stored transcript offers no chat
+    Given a video that has no stored transcript
+    When I open the chat for it
+    Then I am told chat is not available
+    And no fetch is attempted and no model is called
+
+  Scenario: The default model is the summary's model and is switchable
+    When I open the chat
+    Then the model defaults to the model that produced the summary
+    And I can switch among the offered chain models
+
+  Scenario: Switching models re-runs against the same transcript
+    When I ask a question with a different chain model selected
+    Then the chosen model answers
+    And it answers against the same stored transcript
+
+  Scenario: The cloud model is hidden when cloud is disabled
+    Given the cloud fallback model is disabled
+    Then the chat switcher offers only local models
+
+  Scenario: A long transcript is bounded and the chat says so
+    Given the stored transcript is longer than the model budget
+    When I ask a question
+    Then the answer is produced from a bounded portion
+    And the chat notes that it worked from a bounded portion
+
+  Scenario: A multi-turn conversation is ephemeral
+    When I ask a follow-up question
+    Then the prior turn is carried into the answer
+    And nothing about the conversation is written to the database
+
+  Scenario: Chat is reachable only from my own summary view
+    Given another user has a summarized video with a stored transcript
+    When I try to open the chat for their video
+    Then I get a not-found response
+    And no model is called

docs/use-cases/connect_account.feature

@@ -24,12 +24,19 @@ Feature: Connect and manage video accounts
     Then a discovery pass for my account is triggered right away
     And I do not have to wait for the next scheduled pass to see my videos
 
-  Scenario: Connecting summarizes my newest videos right away
+  Scenario: Connecting summarizes my best recent videos right away
     Given I have no connected video accounts
     When I connect my YouTube account
-    Then up to the onboarding cap of my newest videos are summarized through the rate gate
+    Then up to the onboarding cap of my newest likely-good videos are summarized through the rate gate
+    And videos whose known duration is too short or too long are skipped
     And the rest are left to the scheduled recency-bounded pass
 
+  Scenario: The onboarding burst summarizes with a stronger model
+    Given I have no connected video accounts
+    When I connect my YouTube account
+    Then the burst summarizes with the stronger onboarding model first
+    And the standard summarizer chain still follows as a fallback
+
   Scenario: Tokens are never stored in the clear
     When I connect any video account
     Then no OAuth token value is stored in the database

docs/use-cases/inline_expand.feature

@@ -0,0 +1,37 @@
+Feature: Inline-expand summary + Q&A in the list (ADR-031, #16)
+  As a reader skimming my summaries
+  I want to open a summary and its Q&A in place in the list
+  So that I get the full read and follow-up without leaving the list (SPA-like, no page hop)
+
+  # HTMX inline-expand, no SPA framework (ADR-031). Each scenario maps to a Go test
+  # in scenario_coverage_test.go (the BDD name-coverage gate).
+
+  Scenario: A summarized card expands to the full summary in place
+    Given a summarized video in my list
+    When I expand its card
+    Then the full summary, highlights, and takeaways are returned as an in-place card fragment, not a full page
+
+  Scenario: An expanded card collapses back to the compact card
+    Given an expanded card
+    When I collapse it
+    Then the compact card fragment is returned in its place
+
+  Scenario: The expanded card offers the Q&A dock
+    Given chat is enabled
+    When a summarized card is expanded
+    Then the expanded card includes the deeper-dive chat affordance for that video
+
+  Scenario: Only a summarized card offers expand
+    Given a discovered but not-yet-summarized card
+    When the card is rendered
+    Then it shows its summarize/queue footer and no expand affordance
+
+  Scenario: With JS off the card still reaches the full summary
+    Given a summarized card
+    When it is rendered
+    Then its expand affordance carries an href to the detail page as a no-JS fallback
+
+  Scenario: The detail page and the expanded card show the same summary
+    Given a summarized video
+    When I view it on the detail page and as an expanded card
+    Then both render the same summary body (one shared fragment, no drift)

docs/use-cases/observability.feature

@@ -0,0 +1,46 @@
+Feature: Observability — timing and metrics for performance and UX (ADR-030, #15)
+  As the maintainer running Tapir for pilot users
+  I want timing and Prometheus metrics for the activities that drive performance and UX
+  So that I can see latency, model behaviour, and usage — and feed the Stage-0 eval gate
+
+  # AI metrics are the priority (ADR-030 R3). Each scenario maps to a Go test in
+  # test/acceptance/scenario_coverage_test.go (the BDD name-coverage gate).
+
+  Scenario: Summarization latency is recorded per endpoint
+    Given the summarizer runs a transcript through its endpoint chain
+    When an endpoint returns a parseable summary
+    Then the summarize latency is recorded with the model, outcome "success", and whether it was a fallback
+
+  Scenario: A failing summarizer endpoint records its failure outcome
+    Given the summarizer runs a transcript through its endpoint chain
+    When an endpoint errors or returns unparseable output
+    Then the summarize latency is recorded with outcome "error" or "parse_error" before the chain advances
+
+  Scenario: Caption fetch latency is recorded by outcome
+    Given a caption fetch is attempted for a video
+    When it resolves to captions, no captions, or a rate limit
+    Then the caption-fetch latency is recorded labelled by that outcome
+
+  Scenario: LLM token usage is recorded from the completion
+    Given an LLM completion returns a usage block with prompt and completion tokens
+    When the client finishes the call
+    Then the prompt and completion tokens are recorded for that model
+
+  Scenario: Q&A answer latency is recorded
+    Given a user asks a question about a video
+    When the answer is produced from the stored transcript
+    Then the chat answer latency is recorded for the answering model
+
+  Scenario: HTTP requests are counted by route, method, and status
+    Given the metrics HTTP middleware wraps the app
+    When a request is served against a registered route
+    Then it is counted and timed under the bounded route pattern, not the raw path
+
+  Scenario: A successful login is counted
+    Given a user completes the OIDC callback and a session is established
+    Then the login counter is incremented
+
+  Scenario: The metrics endpoint is not on the public app port
+    Given the service is running
+    When the public app mux is inspected
+    Then it exposes no /metrics route — metrics are served on the dedicated metrics port only

docs/use-cases/summarize_new_video.feature

@@ -31,5 +31,16 @@ Feature: Summarize new videos from subscribed channels
     When the watcher sees "Designing for Attention" again
     Then Tapir does not produce a second summary for it
 
+  Scenario: Re-analyzing a stored video does not re-fetch its transcript
+    Given a transcript for "Designing for Attention" is already stored
+    When the video is summarized again
+    Then Tapir reads the stored transcript
+    And Tapir does not fetch captions from YouTube
+
   # Captions-first is the core path (ADR-007). Audio-download + speech-to-text is
   # deferred and intentionally has no scenario here yet.
+  #
+  # Transcript persistence (ADR-021): the stored transcript is shared, keyed by
+  # (provider, provider_video_id) and read before any caption fetch, so the
+  # re-analysis scenario above also covers paste-a-URL and the onboarding burst —
+  # both summarize through the same engine chokepoint.

docs/use-cases/visual_theme.feature

@@ -0,0 +1,29 @@
+Feature: Visual refresh — one charm-reader layout, light + dark themes (ADR-032, #17)
+  As a reader who likes a TUI/charm aesthetic
+  I want a fresh look with a light and a dark theme
+  So that the app feels distinctive and reads well in either mode
+
+  # Direction B (light) + C (dark) are one layout in two palettes (CSS variables),
+  # plus a persisted toggle and an OS-preference default. Colours are reviewed via
+  # the mockups in docs/sketches/, not unit-tested; these scenarios cover the
+  # testable structure. Each maps to a Go test in scenario_coverage_test.go.
+
+  Scenario: Light and dark themes share one layout via CSS variables
+    Given the app stylesheet
+    When it is rendered
+    Then it defines a light palette on the root and a dark palette under data-theme="dark", with no duplicate markup
+
+  Scenario: Without a stored choice the theme follows the OS preference
+    Given a visitor with no saved theme
+    When the page loads
+    Then a prefers-color-scheme dark block applies the dark palette automatically
+
+  Scenario: A persisted toggle switches light and dark
+    Given any page
+    When it is rendered
+    Then it includes a theme-toggle control and a small script that flips data-theme and persists the choice
+
+  Scenario: The expanded card embeds the video player
+    Given a summarized video with a valid provider id
+    When its card is expanded
+    Then the expanded card includes the embedded video player

go.mod

@@ -1,4 +1,4 @@
-module gitea.d-ma.be/mathias/tapir
+module git.d-ma.be/mathias/tapir
 
 go 1.26.1
 
@@ -9,23 +9,33 @@ require (
 	github.com/go-jose/go-jose/v4 v4.1.4
 	github.com/golang-migrate/migrate/v4 v4.19.1
 	github.com/jackc/pgx/v5 v5.9.2
+	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/client_model v0.6.2
 	github.com/stretchr/testify v1.11.1
-	golang.org/x/crypto v0.45.0
 	golang.org/x/oauth2 v0.36.0
 	golang.org/x/time v0.15.0
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/jackc/pgerrcode v0.0.0-20220416144525-469b46aa5efa // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lib/pq v1.10.9 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/rogpeppe/go-internal v1.15.0 // indirect
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -4,6 +4,10 @@ github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERo
 github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/a-h/templ v0.3.1020 h1:ypAT/L5ySWEnZ6Zft/5yfoWXYYkhFNvEFOeeqecg4tw=
 github.com/a-h/templ v0.3.1020/go.mod h1:A2DlK61v+K+NRoGnhmYbNYVmtYHcFO5/AisMvBdDxTM=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/containerd/errdefs v1.0.0 h1:tg5yIfIlQIrxYtu9ajqY42W3lpS19XqdxRQeEwYG8PI=
 github.com/containerd/errdefs v1.0.0/go.mod h1:+YBYIdtsnF4Iw6nWZhJcqGSg/dwvV7tyJ/kCkyJ2k+M=
 github.com/containerd/errdefs/pkg v0.3.0 h1:9IKJ06FvyNlexW690DXuQNx2KA2cUJXx151Xdx3ZPPE=
@@ -37,8 +41,8 @@ github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/golang-migrate/migrate/v4 v4.19.1 h1:OCyb44lFuQfYXYLx1SCxPZQGU7mcaZ7gH9yH4jSFbBA=
 github.com/golang-migrate/migrate/v4 v4.19.1/go.mod h1:CTcgfjxhaUtsLipnLoQRWCrjYXycRz/g5+RWDuYgPrE=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/jackc/pgerrcode v0.0.0-20220416144525-469b46aa5efa h1:s+4MhCQ6YrzisK6hFJUX53drDT4UsSW3DEhKn0ifuHw=
 github.com/jackc/pgerrcode v0.0.0-20220416144525-469b46aa5efa/go.mod h1:a/s9Lp5W7n/DD0VrVoyJ00FbP2ytTPDVOivvn2bMlds=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -49,10 +53,14 @@ github.com/jackc/pgx/v5 v5.9.2 h1:3ZhOzMWnR4yJ+RW1XImIPsD1aNSz4T4fyP7zlQb56hw=
 github.com/jackc/pgx/v5 v5.9.2/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
 github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
 github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
-github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
-github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
+github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
+github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0=
@@ -61,6 +69,8 @@ github.com/moby/term v0.5.0 h1:xt8Q1nalod/v7BqbG21f8mQPqH+xAaC9C3N3wfWbVP0=
 github.com/moby/term v0.5.0/go.mod h1:8FzsFHVUBGZdbDsJw/ot+X+d5HLUbvklYLJ9uGfcI3Y=
 github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.0 h1:8SG7/vwALn54lVB/0yZ/MMwhFrPYtpEHQb2IpWsCzug=
@@ -70,6 +80,14 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
+github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
+github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
+github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
+github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9ZoGs=
+github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
+github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
+github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
 github.com/rogpeppe/go-internal v1.15.0 h1:D0RCU5rMAp+SpgkiNdrjfJ+LX4J1M32V2NeCY7EJ6hc=
 github.com/rogpeppe/go-internal v1.15.0/go.mod h1:DrUVZyrJU+txYW5/1kwtXQSMFio52ZOxX7yM1VHvnxs=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -91,8 +109,8 @@ go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mx
 go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q=
-golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4=
+go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
+go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
 golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
 golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=
 golang.org/x/sync v0.18.0 h1:kr88TuHDroi+UVf+0hZnirlk8o8T+4MrK6mr60WkH/I=
@@ -103,6 +121,8 @@ golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
 golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
 golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
 golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
+google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
+google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=

internal/adapters/chat/chat.go

@@ -0,0 +1,179 @@
+// Package chat implements the per-video deeper-dive chat (ADR-027): a read-only
+// QA over a video's ALREADY-STORED transcript (ADR-021). It is the enforcement
+// point for the feature's load-bearing safety property — stored-transcript-only:
+// the Service has NO VideoSource and NO caption-fetch dependency, only a
+// Completer factory, so it CANNOT reach YouTube or the rate gate by construction.
+// The caller supplies the stored transcript text; chat never fetches.
+//
+// It reuses the same LiteLLM gateway as the summarizer (a chat is a different
+// call, not a new integration) and the same transcript-truncation discipline
+// (TAPIR_MAX_TRANSCRIPT_CHARS) so a long transcript fits a small-context model.
+package chat
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"git.d-ma.be/mathias/tapir/internal/metrics"
+)
+
+// Completer is the minimal LLM chat surface the Service needs. *llm.Client
+// satisfies it; tests use a fake. It is the SAME surface the summarizer uses.
+type Completer interface {
+	Complete(ctx context.Context, system, user string) (string, error)
+}
+
+// Turn is one completed exchange in an ephemeral, session-only conversation
+// (ADR-027 v1: nothing is persisted).
+type Turn struct {
+	Question string
+	Answer   string
+}
+
+// Request is one chat turn: the chosen model, the stored transcript text, the
+// prior turns (for multi-turn context within the session), and the new question.
+type Request struct {
+	Model      string
+	Transcript string
+	History    []Turn
+	Question   string
+}
+
+// Reply is the model's answer plus whether the transcript was bounded to fit the
+// model context (so the UI can be honest that an answer about the tail of a long
+// video may be incomplete).
+type Reply struct {
+	Answer    string
+	Truncated bool
+}
+
+// Service answers questions against a stored transcript via a switchable set of
+// models. models is the ordered, local-first list offered to the user (the cloud
+// model is simply absent when disabled — see cmd wiring); maxChars bounds the
+// transcript sent to any model (0 = unbounded). newClient builds a Completer for
+// a chosen model alias (the same gateway, a different alias).
+type Service struct {
+	newClient func(model string) Completer
+	models    []string
+	maxChars  int
+}
+
+// New constructs a Service. models must be non-empty and already filtered to the
+// offerable set (cloud excluded when disabled) and de-duplicated by the caller.
+func New(newClient func(model string) Completer, models []string, maxChars int) *Service {
+	return &Service{newClient: newClient, models: models, maxChars: maxChars}
+}
+
+// Models returns a copy of the offerable model list (local-first order).
+func (s *Service) Models() []string {
+	out := make([]string, len(s.models))
+	copy(out, s.models)
+	return out
+}
+
+// offers reports whether model is in the offerable set — the guard that keeps an
+// arbitrary, un-offered alias (e.g. a forged form value) from reaching the gateway.
+func (s *Service) offers(model string) bool {
+	for _, m := range s.models {
+		if m == model {
+			return true
+		}
+	}
+	return false
+}
+
+// DefaultModel resolves the model a fresh chat opens with: the summary's own
+// model when it is still an offered option (the ADR-027 default — chat continues
+// in the model that produced the summary), otherwise the first offered model.
+// Returns "" only when no models are configured.
+func (s *Service) DefaultModel(summaryModel string) string {
+	if summaryModel != "" && s.offers(summaryModel) {
+		return summaryModel
+	}
+	if len(s.models) > 0 {
+		return s.models[0]
+	}
+	return ""
+}
+
+// Answer runs one chat turn. The model is forced back to a default if the request
+// names an un-offered alias, so chat can never call the gateway with an arbitrary
+// model. The transcript is truncated up front (reporting whether it was cut) and
+// passed as system context; the running conversation is the user message.
+func (s *Service) Answer(ctx context.Context, req Request) (Reply, error) {
+	if len(s.models) == 0 {
+		return Reply{}, fmt.Errorf("chat: no models configured")
+	}
+	model := req.Model
+	if !s.offers(model) {
+		model = s.DefaultModel("")
+	}
+
+	transcript, truncated := truncate(req.Transcript, s.maxChars)
+	system := buildSystem(transcript, truncated)
+	user := buildUser(req.History, req.Question)
+
+	start := time.Now()
+	out, err := s.newClient(model).Complete(ctx, system, user)
+	if err != nil {
+		return Reply{}, fmt.Errorf("chat: %s: %w", model, err)
+	}
+	dur := time.Since(start)
+	metrics.ObserveChat(model, dur)
+	slog.Default().Info("chat answer", "model", model, "elapsed_ms", dur.Milliseconds())
+	answer := strings.TrimSpace(out)
+	if answer == "" {
+		return Reply{}, fmt.Errorf("chat: %s returned an empty answer", model)
+	}
+	return Reply{Answer: answer, Truncated: truncated}, nil
+}
+
+const systemPreamble = `You are Tapir, answering questions about ONE video using ONLY the transcript below.
+Ground every answer in the transcript. If the transcript does not contain the answer, say so plainly rather than guessing.`
+
+const truncatedNote = `
+The transcript below is truncated to fit the model — if a question seems to concern something missing, note it may be beyond the available portion.`
+
+// buildSystem frames the model as a transcript-grounded QA assistant and embeds
+// the (possibly truncated) transcript as context.
+func buildSystem(transcript string, truncated bool) string {
+	var b strings.Builder
+	b.WriteString(systemPreamble)
+	if truncated {
+		b.WriteString(truncatedNote)
+	}
+	b.WriteString("\n\nTranscript:\n")
+	b.WriteString(transcript)
+	return b.String()
+}
+
+// buildUser renders the running conversation as the user message: prior turns as
+// Q/A pairs followed by the new question. Folding history into one message keeps
+// the Completer surface (a single system+user call) unchanged — no new llm method.
+func buildUser(history []Turn, question string) string {
+	var b strings.Builder
+	for _, t := range history {
+		fmt.Fprintf(&b, "Q: %s\nA: %s\n\n", t.Question, t.Answer)
+	}
+	fmt.Fprintf(&b, "Q: %s", question)
+	return b.String()
+}
+
+// truncate caps content to max bytes on a UTF-8 rune boundary, reporting whether
+// it cut. It mirrors the summarizer's truncation discipline (ADR-022) but returns
+// the cut flag so the chat UI can be honest about a bounded transcript. A
+// non-positive max (or content already within budget) returns content unchanged.
+func truncate(content string, max int) (string, bool) {
+	if max <= 0 || len(content) <= max {
+		return content, false
+	}
+	cut := max
+	for cut > 0 && !utf8.RuneStart(content[cut]) {
+		cut--
+	}
+	return content[:cut], true
+}

internal/adapters/chat/chat_test.go

@@ -0,0 +1,164 @@
+package chat
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+)
+
+// recordingCompleter captures the system+user it was asked with and returns a
+// canned answer (or error). It also records which model alias built it.
+type recordingCompleter struct {
+	model      string
+	lastSystem string
+	lastUser   string
+	answer     string
+	err        error
+	calls      *int
+}
+
+func (c *recordingCompleter) Complete(_ context.Context, system, user string) (string, error) {
+	*c.calls++
+	c.lastSystem = system
+	c.lastUser = user
+	if c.err != nil {
+		return "", c.err
+	}
+	return c.answer, nil
+}
+
+// factory builds a recordingCompleter per model and records the last one built so
+// the test can assert which model alias was actually used for the gateway call.
+type factory struct {
+	answer string
+	err    error
+	calls  int
+	used   *recordingCompleter
+}
+
+func (f *factory) make(model string) Completer {
+	c := &recordingCompleter{model: model, answer: f.answer, err: f.err, calls: &f.calls}
+	f.used = c
+	return c
+}
+
+func TestModelsAreOfferedLocalFirstAndCopied(t *testing.T) {
+	f := &factory{answer: "ok"}
+	s := New(f.make, []string{"koala/phi4-mini", "iguana/gemma4-26b"}, 0)
+
+	got := s.Models()
+	want := []string{"koala/phi4-mini", "iguana/gemma4-26b"}
+	if len(got) != len(want) || got[0] != want[0] || got[1] != want[1] {
+		t.Fatalf("Models() = %v, want %v", got, want)
+	}
+	// Mutating the returned slice must not corrupt the Service's list.
+	got[0] = "tampered"
+	if s.Models()[0] != "koala/phi4-mini" {
+		t.Fatal("Models() leaked its backing slice")
+	}
+}
+
+func TestDefaultModelIsTheSummarysModelWhenOffered(t *testing.T) {
+	f := &factory{answer: "ok"}
+	s := New(f.make, []string{"koala/phi4-mini", "iguana/gemma4-26b", "berget/mistral-small"}, 0)
+
+	if got := s.DefaultModel("iguana/gemma4-26b"); got != "iguana/gemma4-26b" {
+		t.Fatalf("DefaultModel(summary) = %q, want the summary's model", got)
+	}
+	// A summary model no longer offered (e.g. cloud disabled) falls back to first.
+	if got := s.DefaultModel("berget/old-model"); got != "koala/phi4-mini" {
+		t.Fatalf("DefaultModel(un-offered) = %q, want the first offered model", got)
+	}
+	// No summary model recorded → first offered.
+	if got := s.DefaultModel(""); got != "koala/phi4-mini" {
+		t.Fatalf("DefaultModel(\"\") = %q, want the first offered model", got)
+	}
+}
+
+func TestAnswerGroundsOnTranscriptAndCarriesHistory(t *testing.T) {
+	f := &factory{answer: "  The video is about attention.  "}
+	s := New(f.make, []string{"koala/phi4-mini"}, 0)
+
+	reply, err := s.Answer(context.Background(), Request{
+		Model:      "koala/phi4-mini",
+		Transcript: "ATTENTION-TRANSCRIPT-MARKER",
+		History:    []Turn{{Question: "who", Answer: "the host"}},
+		Question:   "what is it about",
+	})
+	if err != nil {
+		t.Fatalf("Answer: %v", err)
+	}
+	if reply.Answer != "The video is about attention." {
+		t.Fatalf("answer not trimmed: %q", reply.Answer)
+	}
+	if reply.Truncated {
+		t.Fatal("short transcript must not report truncated")
+	}
+	// The transcript rides in the system prompt; the conversation in the user msg.
+	if !strings.Contains(f.used.lastSystem, "ATTENTION-TRANSCRIPT-MARKER") {
+		t.Fatal("transcript not grounded into the system prompt")
+	}
+	if !strings.Contains(f.used.lastUser, "Q: who") || !strings.Contains(f.used.lastUser, "A: the host") {
+		t.Fatalf("history not carried into the user message: %q", f.used.lastUser)
+	}
+	if !strings.Contains(f.used.lastUser, "what is it about") {
+		t.Fatal("new question missing from the user message")
+	}
+}
+
+func TestAnswerTruncatesLongTranscriptAndReportsIt(t *testing.T) {
+	f := &factory{answer: "answer"}
+	s := New(f.make, []string{"koala/phi4-mini"}, 10)
+
+	reply, err := s.Answer(context.Background(), Request{
+		Model:      "koala/phi4-mini",
+		Transcript: strings.Repeat("x", 500),
+		Question:   "summarize",
+	})
+	if err != nil {
+		t.Fatalf("Answer: %v", err)
+	}
+	if !reply.Truncated {
+		t.Fatal("a transcript past maxChars must report Truncated")
+	}
+	if strings.Count(f.used.lastSystem, "x") != 10 {
+		t.Fatalf("transcript not bounded to maxChars: got %d x's", strings.Count(f.used.lastSystem, "x"))
+	}
+}
+
+func TestAnswerForcesAnUnofferedModelBackToDefault(t *testing.T) {
+	f := &factory{answer: "answer"}
+	s := New(f.make, []string{"koala/phi4-mini", "iguana/gemma4-26b"}, 0)
+
+	// A forged/un-offered model must never reach the gateway as-is — it is forced
+	// to the default offered model (the cloud-absent guarantee depends on this).
+	_, err := s.Answer(context.Background(), Request{
+		Model:      "berget/secret-cloud-model",
+		Transcript: "t",
+		Question:   "q",
+	})
+	if err != nil {
+		t.Fatalf("Answer: %v", err)
+	}
+	if f.used.model != "koala/phi4-mini" {
+		t.Fatalf("un-offered model reached the gateway as %q, want the default", f.used.model)
+	}
+}
+
+func TestAnswerPropagatesCompleterError(t *testing.T) {
+	f := &factory{err: errors.New("gateway down")}
+	s := New(f.make, []string{"koala/phi4-mini"}, 0)
+
+	_, err := s.Answer(context.Background(), Request{Model: "koala/phi4-mini", Transcript: "t", Question: "q"})
+	if err == nil {
+		t.Fatal("expected the gateway error to propagate")
+	}
+}
+
+func TestAnswerRejectsEmptyModelSet(t *testing.T) {
+	s := New(func(string) Completer { return nil }, nil, 0)
+	if _, err := s.Answer(context.Background(), Request{Question: "q"}); err == nil {
+		t.Fatal("expected an error when no models are configured")
+	}
+}

internal/adapters/llm/client.go

@@ -32,17 +32,46 @@ type Client struct {
 	model      string
 	maxTokens  int
 	httpClient *http.Client
+	usageHook  func(model string, prompt, completion int)
+}
+
+// Option configures a Client at construction. Variadic so the existing 4-arg
+// call sites stay valid as new knobs are added.
+type Option func(*Client)
+
+// WithMaxTokens overrides the per-request completion budget. The summarizer uses
+// this to cap completion for small-context models (e.g. koala/phi4-mini, 8k):
+// with the default 8192 budget, prompt + max_tokens overflows an 8k context and
+// the gateway returns HTTP 400. A non-positive n is ignored (keeps the default).
+func WithMaxTokens(n int) Option {
+	return func(c *Client) {
+		if n > 0 {
+			c.maxTokens = n
+		}
+	}
+}
+
+// WithUsageHook registers a callback fired after a successful completion with the
+// model and the prompt/completion token counts from the response usage block. It
+// keeps this copied, stdlib-only package (ADR-004) decoupled from metrics: the
+// caller wires it to internal/metrics, the client imports nothing. nil is ignored.
+func WithUsageHook(fn func(model string, prompt, completion int)) Option {
+	return func(c *Client) { c.usageHook = fn }
 }
 
 // New constructs a Client.
-func New(baseURL, apiKey, model string, timeout time.Duration) *Client {
-	return &Client{
+func New(baseURL, apiKey, model string, timeout time.Duration, opts ...Option) *Client {
+	c := &Client{
 		baseURL:    strings.TrimRight(baseURL, "/"),
 		apiKey:     apiKey,
 		model:      model,
 		maxTokens:  defaultMaxTokens,
 		httpClient: &http.Client{Timeout: timeout},
 	}
+	for _, opt := range opts {
+		opt(c)
+	}
+	return c
 }
 
 type chatRequest struct {
@@ -61,6 +90,10 @@ type chatResponse struct {
 	Choices []struct {
 		Message message `json:"message"`
 	} `json:"choices"`
+	Usage struct {
+		PromptTokens     int `json:"prompt_tokens"`
+		CompletionTokens int `json:"completion_tokens"`
+	} `json:"usage"`
 }
 
 // Complete sends a system + user message and returns the assistant's reply.
@@ -132,5 +165,8 @@ func (c *Client) Complete(ctx context.Context, system, user string) (string, err
 	if len(cr.Choices) == 0 {
 		return "", fmt.Errorf("LLM returned no choices")
 	}
+	if c.usageHook != nil {
+		c.usageHook(c.model, cr.Usage.PromptTokens, cr.Usage.CompletionTokens)
+	}
 	return cr.Choices[0].Message.Content, nil
 }

internal/adapters/llm/client_test.go

@@ -64,6 +64,51 @@ func TestClient_SendsMaxTokens(t *testing.T) {
 	}
 }
 
+// TestClient_WithMaxTokens overrides the completion budget — the summarizer caps
+// it small so prompt + max_tokens fits a small-context model's window (8k).
+func TestClient_WithMaxTokens(t *testing.T) {
+	var body chatRequest
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_ = json.NewDecoder(r.Body).Decode(&body)
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"choices": []map[string]any{{"message": map[string]any{"content": "ok"}}},
+		})
+	}))
+	defer srv.Close()
+
+	c := New(srv.URL, "", "test-model", 10*time.Second, WithMaxTokens(1500))
+	if _, err := c.Complete(context.Background(), "sys", "user"); err != nil {
+		t.Fatalf("Complete: %v", err)
+	}
+	if body.MaxTokens != 1500 {
+		t.Errorf("max_tokens = %d, want 1500", body.MaxTokens)
+	}
+}
+
+// TestClient_UsageHookRecordsTokens: the usage hook fires with the model and the
+// prompt/completion token counts parsed from the response usage block.
+func TestClient_UsageHookRecordsTokens(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"choices": []map[string]any{{"message": map[string]any{"content": "ok"}}},
+			"usage":   map[string]any{"prompt_tokens": 123, "completion_tokens": 45},
+		})
+	}))
+	defer srv.Close()
+
+	var gotModel string
+	var gotPrompt, gotCompletion int
+	c := New(srv.URL, "", "test-model", 10*time.Second, WithUsageHook(func(model string, p, comp int) {
+		gotModel, gotPrompt, gotCompletion = model, p, comp
+	}))
+	if _, err := c.Complete(context.Background(), "sys", "user"); err != nil {
+		t.Fatalf("Complete: %v", err)
+	}
+	if gotModel != "test-model" || gotPrompt != 123 || gotCompletion != 45 {
+		t.Errorf("usage hook got (%q, %d, %d), want (test-model, 123, 45)", gotModel, gotPrompt, gotCompletion)
+	}
+}
+
 func TestClient_ReturnsErrorOnNon200(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "overloaded", http.StatusServiceUnavailable)

internal/adapters/secrets/file.go

@@ -18,7 +18,7 @@ import (
 	"path/filepath"
 	"sync"
 
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
 // FileStore is a SecretStore backed by a single 0600 JSON file mapping opaque

internal/adapters/secrets/file_test.go

@@ -7,7 +7,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/secrets"
+	"git.d-ma.be/mathias/tapir/internal/adapters/secrets"
 )
 
 func TestPutThenGet(t *testing.T) {

internal/adapters/store/account.go

@@ -10,10 +10,13 @@ import (
 // DeleteUser permanently removes a user and all of their data. It runs through
 // withUser so RLS confines every statement to the calling user's own rows.
 //
-// Deleting the users row cascades (ON DELETE CASCADE) to videos, transcripts,
-// summaries (→ sink_deliveries), video_connections, and the user_identities map
-// — referential-integrity cascades bypass RLS, so a user's child rows are removed
-// even though the deleting connection is scoped. summary_actions and login_events
+// Deleting the users row cascades (ON DELETE CASCADE) to videos, summaries
+// (→ sink_deliveries), video_connections, and the user_identities map —
+// referential-integrity cascades bypass RLS, so a user's child rows are removed
+// even though the deleting connection is scoped. Transcripts are NOT removed:
+// since ADR-021 they are shared public content keyed by (provider,
+// provider_video_id) with no user_id, so another user may still reference the
+// same row — a user deletion must not strip shared caption content. summary_actions and login_events
 // are the exceptions: each carries a user_id but has NO foreign key to users
 // (migrations 002 and 010), so the cascade does not reach them; they are deleted
 // explicitly in the same scoped transaction. Deleting an absent user is a no-op

internal/adapters/store/channel_caption.go

@@ -0,0 +1,83 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+// CaptionlessChannels returns the set of channel ids currently suppressed for the
+// user — channels whose recent videos all yielded no captions, within their
+// suppression window (ADR-024). The runner skips caption fetches for these
+// channels' videos. A channel whose window has expired is not returned, so its
+// next video is re-probed (auto-recovery).
+func (s *Store) CaptionlessChannels(ctx context.Context, userID string) (map[string]bool, error) {
+	out := map[string]bool{}
+	err := s.withUser(ctx, userID, func(tx pgx.Tx) error {
+		rows, err := tx.Query(ctx, `
+			SELECT channel_id FROM channel_caption_state
+			WHERE user_id = $1 AND captionless_until IS NOT NULL AND captionless_until > now()`,
+			userID)
+		if err != nil {
+			return fmt.Errorf("store: caption-less channels: %w", err)
+		}
+		defer rows.Close()
+		for rows.Next() {
+			var ch string
+			if err := rows.Scan(&ch); err != nil {
+				return fmt.Errorf("store: scan caption-less channel: %w", err)
+			}
+			out[ch] = true
+		}
+		return rows.Err()
+	})
+	return out, err
+}
+
+// RecordChannelCaptionOutcome updates a channel's caption-availability memory
+// after a fetch attempt (ADR-024). hadCaptions resets the channel (consecutive
+// count to 0, suppression cleared). Otherwise the consecutive no-caption count is
+// incremented; once it reaches threshold the channel is suppressed for window.
+// threshold <= 0 is a no-op (feature disabled). An empty channelID is ignored
+// (some sources may not carry one).
+func (s *Store) RecordChannelCaptionOutcome(ctx context.Context, userID, channelID string, hadCaptions bool, threshold int, window time.Duration) error {
+	if channelID == "" || threshold <= 0 {
+		return nil
+	}
+	return s.withUser(ctx, userID, func(tx pgx.Tx) error {
+		if hadCaptions {
+			_, err := tx.Exec(ctx, `
+				INSERT INTO channel_caption_state (user_id, channel_id, consecutive_none, captionless_until, updated_at)
+				VALUES ($1, $2, 0, NULL, now())
+				ON CONFLICT (user_id, channel_id)
+				DO UPDATE SET consecutive_none = 0, captionless_until = NULL, updated_at = now()`,
+				userID, channelID)
+			if err != nil {
+				return fmt.Errorf("store: reset channel caption state: %w", err)
+			}
+			return nil
+		}
+		// No captions: increment the streak; suppress once it reaches threshold.
+		// captionless_until is set from the NEW count inside the same statement so
+		// the decision is atomic with the increment.
+		until := time.Now().Add(window)
+		_, err := tx.Exec(ctx, `
+			INSERT INTO channel_caption_state (user_id, channel_id, consecutive_none, captionless_until, updated_at)
+			VALUES ($1, $2, 1, CASE WHEN 1 >= $3 THEN $4::timestamptz ELSE NULL END, now())
+			ON CONFLICT (user_id, channel_id)
+			DO UPDATE SET
+				consecutive_none = channel_caption_state.consecutive_none + 1,
+				captionless_until = CASE
+					WHEN channel_caption_state.consecutive_none + 1 >= $3 THEN $4::timestamptz
+					ELSE channel_caption_state.captionless_until
+				END,
+				updated_at = now()`,
+			userID, channelID, threshold, until)
+		if err != nil {
+			return fmt.Errorf("store: record channel no-caption: %w", err)
+		}
+		return nil
+	})
+}

internal/adapters/store/channel_caption_test.go

@@ -0,0 +1,67 @@
+package store_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestChannelCaptionMemory_SuppressesAfterThreshold(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	super := rawPool(t)
+	resetDB(t, super)
+	seedUser(t, super, userA)
+
+	const threshold = 3
+	window := time.Hour
+
+	// Below threshold: not yet suppressed.
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanX", false, threshold, window))
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanX", false, threshold, window))
+	got, err := s.CaptionlessChannels(ctx, userA)
+	require.NoError(t, err)
+	require.NotContains(t, got, "chanX", "2 < threshold 3: not suppressed yet")
+
+	// Crossing the threshold suppresses the channel.
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanX", false, threshold, window))
+	got, err = s.CaptionlessChannels(ctx, userA)
+	require.NoError(t, err)
+	require.Contains(t, got, "chanX", "3 consecutive no-caption results suppress the channel")
+
+	// A successful caption fetch resets it.
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanX", true, threshold, window))
+	got, err = s.CaptionlessChannels(ctx, userA)
+	require.NoError(t, err)
+	require.NotContains(t, got, "chanX", "a captioned video clears suppression")
+}
+
+func TestChannelCaptionMemory_WindowExpiryReProbes(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	super := rawPool(t)
+	resetDB(t, super)
+	seedUser(t, super, userA)
+
+	// A negative window means captionless_until lands in the past — modelling an
+	// elapsed suppression window, which must make the channel eligible again.
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanY", false, 1, -time.Hour))
+	got, err := s.CaptionlessChannels(ctx, userA)
+	require.NoError(t, err)
+	require.NotContains(t, got, "chanY", "an expired window re-enables the channel for a re-probe")
+}
+
+func TestChannelCaptionMemory_DisabledThresholdIsNoOp(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	super := rawPool(t)
+	resetDB(t, super)
+	seedUser(t, super, userA)
+
+	require.NoError(t, s.RecordChannelCaptionOutcome(ctx, userA, "chanZ", false, 0, time.Hour))
+	got, err := s.CaptionlessChannels(ctx, userA)
+	require.NoError(t, err)
+	require.Empty(t, got, "threshold 0 disables the memory — nothing recorded")
+}

internal/adapters/store/connections_test.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // seedUserRow inserts a bare users row (FK target for a connection) as the

internal/adapters/store/identity_test.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 const (

internal/adapters/store/migrate_test.go

@@ -3,6 +3,7 @@ package store_test
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"os"
 	"testing"
 
@@ -34,6 +35,30 @@ func fileMigrator(t *testing.T) *migrate.Migrate {
 	return m
 }
 
+// headVersion reports the current (HEAD) schema version so a test can restore
+// to it after stepping down, without hard-coding what HEAD is. Adding a
+// migration on top changes HEAD but no test that uses this needs editing.
+func headVersion(t *testing.T, m *migrate.Migrate) uint {
+	t.Helper()
+	v, dirty, err := m.Version()
+	require.NoError(t, err)
+	require.False(t, dirty, "schema must not be dirty")
+	return v
+}
+
+// migrateTo drives the schema to an exact version *by version number*, not by
+// step count. This is the whole point of the migrate-test design: a migration
+// added above the target does not shift any count here, so unrelated tests stay
+// green (see issue #8). ErrNoChange (already at that version) is not a failure.
+func migrateTo(t *testing.T, m *migrate.Migrate, version uint) {
+	t.Helper()
+	err := m.Migrate(version)
+	if errors.Is(err, migrate.ErrNoChange) {
+		return
+	}
+	require.NoError(t, err)
+}
+
 // loginEventsExists reports whether the login_events relation is present.
 func loginEventsExists(t *testing.T) bool {
 	t.Helper()
@@ -53,19 +78,15 @@ func TestMigration010LoginEventsUpDown(t *testing.T) {
 	require.True(t, loginEventsExists(t), "login_events must exist at latest migration")
 
 	m := fileMigrator(t)
-	// 011, 012, 013 sit above 010; step them down first so 010 is exercised in isolation.
-	require.NoError(t, m.Steps(-1), "down 013 drops channel_errors, login_events intact")
-	require.True(t, loginEventsExists(t), "013 down leaves login_events intact")
-	require.NoError(t, m.Steps(-1), "down 012 is a no-op, login_events intact")
-	require.True(t, loginEventsExists(t), "012 down leaves login_events intact")
-	require.NoError(t, m.Steps(-1), "down 011 must not touch login_events")
-	require.True(t, loginEventsExists(t), "011 down leaves login_events intact")
+	head := headVersion(t, m)
 
-	require.NoError(t, m.Steps(-1), "down 010 must drop login_events")
+	migrateTo(t, m, 9) // just below 010 — everything above steps down
 	require.False(t, loginEventsExists(t), "login_events must be gone after the down migration")
 
-	require.NoError(t, m.Steps(4), "up must recreate 010 then re-apply 011, 012, 013")
+	migrateTo(t, m, 10) // up 010
 	require.True(t, loginEventsExists(t), "login_events must be restored after the up migration")
+
+	migrateTo(t, m, head) // restore to HEAD for sibling tests
 }
 
 // autoSummarizeDefault reads the users.auto_summarize column default as text
@@ -87,15 +108,43 @@ func TestMigration011AutoSummarizeDefaultUpDown(t *testing.T) {
 	require.Equal(t, "true", autoSummarizeDefault(t), "011 sets the default to TRUE")
 
 	m := fileMigrator(t)
-	require.NoError(t, m.Steps(-1), "down 013 drops channel_errors")
-	require.NoError(t, m.Steps(-1), "down 012 is a no-op")
-	require.NoError(t, m.Steps(-1), "down 011 reverts the column default")
+	head := headVersion(t, m)
+
+	migrateTo(t, m, 10) // just below 011 — reverts the column default
 	require.Equal(t, "false", autoSummarizeDefault(t), "default is FALSE after the down migration")
 
-	require.NoError(t, m.Steps(1), "up 011 re-applies the TRUE default")
+	migrateTo(t, m, 11) // up 011 re-applies the TRUE default
 	require.Equal(t, "true", autoSummarizeDefault(t))
-	require.NoError(t, m.Steps(1), "up 012 runs clean (no FORCE RLS on fresh schema)")
-	require.NoError(t, m.Steps(1), "up 013 creates channel_errors")
+
+	migrateTo(t, m, head) // restore to HEAD for sibling tests
+}
+
+// channelTitleExists reports whether videos.channel_title is present.
+func channelTitleExists(t *testing.T) bool {
+	t.Helper()
+	var exists bool
+	require.NoError(t, rawPool(t).QueryRow(context.Background(),
+		`SELECT EXISTS (SELECT 1 FROM information_schema.columns
+		  WHERE table_name = 'videos' AND column_name = 'channel_title')`).Scan(&exists))
+	return exists
+}
+
+// TestMigration014VideoChannelTitleUpDown proves 014 is reversible: down drops
+// videos.channel_title, up recreates it.
+func TestMigration014VideoChannelTitleUpDown(t *testing.T) {
+	newStore(t) // latest (014 applied)
+	require.True(t, channelTitleExists(t), "channel_title exists at latest migration")
+
+	m := fileMigrator(t)
+	head := headVersion(t, m)
+
+	migrateTo(t, m, 13) // just below 014 — drops channel_title
+	require.False(t, channelTitleExists(t), "channel_title must be gone after the down migration")
+
+	migrateTo(t, m, 14) // up 014 recreates channel_title
+	require.True(t, channelTitleExists(t), "channel_title must be restored after the up migration")
+
+	migrateTo(t, m, head) // restore to HEAD for sibling tests
 }
 
 // TestMigration012FixAutoSummarizeRLS proves 012 runs cleanly and flips any
@@ -106,7 +155,11 @@ func TestMigration012FixAutoSummarizeRLS(t *testing.T) {
 
 	// Round-trip: down 012, then up 012 — must be idempotent.
 	m := fileMigrator(t)
-	require.NoError(t, m.Steps(-1), "down 012 must not error")
-	require.NoError(t, m.Steps(1), "up 012 must re-apply cleanly")
+	head := headVersion(t, m)
+
+	migrateTo(t, m, 11) // down 012 must not error
+	migrateTo(t, m, 12) // up 012 must re-apply cleanly
 	require.Equal(t, "true", autoSummarizeDefault(t), "default still TRUE after 012 re-applied")
+
+	migrateTo(t, m, head) // restore to HEAD for sibling tests
 }

internal/adapters/store/migrations/014_video_channel_title.down.sql

@@ -0,0 +1 @@
+ALTER TABLE videos DROP COLUMN channel_title;

internal/adapters/store/migrations/014_video_channel_title.up.sql

@@ -0,0 +1,8 @@
+-- Store the source channel's title per video so the list can offer a real
+-- channel filter (multi-select of the user's channels) instead of the dead
+-- free-text field that only ever matched the provider string. Nullable: existing
+-- rows backfill on the next discovery pass (UpsertVideo writes it); pasted videos
+-- get it immediately from videos.list. No FK to a channels table at Stage 0 — the
+-- title is a denormalised display/filter value, consistent with the existing
+-- subscription_id-stays-NULL stance (data-model.md).
+ALTER TABLE videos ADD COLUMN channel_title TEXT;

internal/adapters/store/migrations/015_shared_transcripts.down.sql

@@ -0,0 +1,19 @@
+-- Down 015: restore the per-user RLS-scoped transcripts shape (001 + 003).
+DROP TABLE transcripts;
+
+CREATE TABLE transcripts (
+    video_id    UUID PRIMARY KEY REFERENCES videos(id) ON DELETE CASCADE,
+    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    source      TEXT NOT NULL,
+    language    TEXT,
+    content     TEXT,
+    resolved_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_transcripts_user_id ON transcripts(user_id);
+
+ALTER TABLE transcripts ENABLE ROW LEVEL SECURITY;
+ALTER TABLE transcripts FORCE ROW LEVEL SECURITY;
+CREATE POLICY transcripts_isolation ON transcripts
+    FOR ALL
+    USING (user_id = current_setting('tapir.current_user_id', true)::uuid);

internal/adapters/store/migrations/015_shared_transcripts.up.sql

@@ -0,0 +1,30 @@
+-- Migration 015: transcripts become SHARED public-content storage (ADR-021).
+--
+-- The per-user transcripts table from 001 (PK videos.id, user_id NOT NULL, RLS
+-- FORCEd in 003) was dead: no application code ever read or wrote it — only the
+-- transcript_status columns on `videos` (007) carried fetch outcomes. ADR-021
+-- repurposes it as the single shared store of public caption content, keyed by
+-- the cross-user dedup key (provider, provider_video_id) — the video's public
+-- identity, not Tapir's per-user videos.id — so re-analysis never re-fetches
+-- from YouTube (ADR-010/014).
+--
+-- It holds ONLY public caption content + the video's public id (nothing
+-- user-identifying), so it is deliberately NOT RLS-scoped: no user_id, no
+-- policy, no FORCE. This is the single, intentional exception to the ADR-012
+-- isolation boundary; rls_test.go asserts the boundary is exactly here and
+-- nowhere else. Dropping the old table drops its RLS policy with it; it held no
+-- real data, so drop+recreate loses nothing.
+DROP TABLE transcripts;
+
+CREATE TABLE transcripts (
+    provider          TEXT NOT NULL,
+    provider_video_id TEXT NOT NULL,
+    source            TEXT NOT NULL, -- 'captions' (content set) | 'none' (no captions; content NULL)
+    language          TEXT,
+    content           TEXT,
+    fetched_at        TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (provider, provider_video_id)
+);
+
+COMMENT ON TABLE transcripts IS
+    'Shared public caption content keyed by (provider, provider_video_id). NOT RLS-scoped — public content only, de-facto cross-user dedup (ADR-021).';

internal/adapters/store/migrations/016_channel_caption_state.down.sql

@@ -0,0 +1 @@
+DROP TABLE channel_caption_state;

internal/adapters/store/migrations/016_channel_caption_state.up.sql

@@ -0,0 +1,30 @@
+-- Migration 016: per-(user, channel) caption-availability memory (ADR-024).
+--
+-- Some channels never publish English captions (foreign-language news, music,
+-- etc.). Each of their new videos still costs ONE rate-limited caption fetch
+-- (ADR-014) before resolving to "none" — and on a throttled egress IP that fetch
+-- may 429 and churn through the backoff machinery first. This table remembers
+-- channels that repeatedly yield no captions so discovery can stop attempting
+-- their videos, freeing the scarce fetch budget for channels that do have them.
+--
+-- consecutive_none counts no-caption outcomes in a row; a successful fetch resets
+-- it to 0. Once it crosses the threshold the channel is suppressed until
+-- captionless_until, after which one video is re-probed (auto-recovery for a
+-- channel that starts adding captions). Per-user + RLS-scoped, consistent with
+-- the rest of the user-owned schema (subscriptions are per-user; ADR-012).
+CREATE TABLE channel_caption_state (
+    user_id           UUID        NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    channel_id        TEXT        NOT NULL,
+    consecutive_none  INT         NOT NULL DEFAULT 0,
+    captionless_until TIMESTAMPTZ,
+    updated_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (user_id, channel_id)
+);
+
+CREATE INDEX idx_channel_caption_state_user_id ON channel_caption_state(user_id);
+
+ALTER TABLE channel_caption_state ENABLE ROW LEVEL SECURITY;
+ALTER TABLE channel_caption_state FORCE ROW LEVEL SECURITY;
+CREATE POLICY channel_caption_state_isolation ON channel_caption_state
+    FOR ALL
+    USING (user_id = current_setting('tapir.current_user_id', true)::uuid);

internal/adapters/store/reads.go

@@ -29,6 +29,7 @@ type SummaryRow struct {
 	ProviderVideoID string    // videos.provider_video_id; empty when no videos row
 	Title           string    // videos.title; empty when no videos row
 	Channel         string    // videos.provider for now; empty when no videos row
+	ChannelTitle    string    // videos.channel_title; the source channel, for display + filtering
 	URL             string    // videos.url; empty when no videos row
 	PublishedAt     time.Time // videos.published_at; zero when absent
 	Summary         string
@@ -137,7 +138,8 @@ const selectVideo = `
 	       COALESCE(s.created_at, v.seen_at),
 	       (s.id IS NOT NULL) AS summarized,
 	       v.summarize_requested,
-	       COALESCE(v.transcript_status, '')
+	       COALESCE(v.transcript_status, ''),
+	       COALESCE(v.channel_title, '')
 	  FROM videos v
 	  LEFT JOIN summaries s ON s.video_id = v.id AND s.user_id = v.user_id`
 
@@ -254,6 +256,7 @@ func scanVideoRow(rows pgx.Row) (SummaryRow, error) {
 		&row.Summarized,
 		&row.SummarizeRequested,
 		&row.TranscriptStatus,
+		&row.ChannelTitle,
 	); err != nil {
 		return SummaryRow{}, fmt.Errorf("store: scan video: %w", err)
 	}

internal/adapters/store/reads_test.go

@@ -8,7 +8,7 @@ import (
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // seedVideo inserts a videos row whose id matches a summary's video_id, so the

internal/adapters/store/report.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"sort"
+	"time"
 
 	"github.com/jackc/pgx/v5"
 )
@@ -32,7 +33,12 @@ type UserActiveWeeks struct {
 // Scope note: the enumeration covers users with a Dex identity (the web users the
 // gate is about). A CLI-only user created by the store sink without an identity
 // row would not appear — out of scope for this gate.
-func (s *Store) ActiveWeeks(ctx context.Context) ([]UserActiveWeeks, error) {
+// ActiveWeeks counts each user's distinct active weeks from `since` onward. A zero
+// `since` means no lower bound (count all history). The Stage-0 gate baseline is
+// set by the caller (the report command) to the date real usage tracking began,
+// so pre-launch noise — testing, the period the pilot was blocked — does not count
+// toward the return-usage signal (ADR-016).
+func (s *Store) ActiveWeeks(ctx context.Context, since time.Time) ([]UserActiveWeeks, error) {
 	userIDs, err := s.identityUserIDs(ctx)
 	if err != nil {
 		return nil, err
@@ -40,7 +46,7 @@ func (s *Store) ActiveWeeks(ctx context.Context) ([]UserActiveWeeks, error) {
 
 	out := make([]UserActiveWeeks, 0, len(userIDs))
 	for _, uid := range userIDs {
-		row, err := s.activeWeeksFor(ctx, uid)
+		row, err := s.activeWeeksFor(ctx, uid, since)
 		if err != nil {
 			return nil, err
 		}
@@ -85,18 +91,18 @@ func (s *Store) identityUserIDs(ctx context.Context) ([]string, error) {
 // activeWeeksFor counts one user's distinct active weeks (reads UNION acts) and
 // reads their display name, RLS-scoped via withUser. The UNION dedups a week that
 // has both a login and an action so it counts once.
-func (s *Store) activeWeeksFor(ctx context.Context, userID string) (UserActiveWeeks, error) {
+func (s *Store) activeWeeksFor(ctx context.Context, userID string, since time.Time) (UserActiveWeeks, error) {
 	res := UserActiveWeeks{UserID: userID}
 	if err := s.withUser(ctx, userID, func(tx pgx.Tx) error {
 		if err := tx.QueryRow(ctx,
 			`WITH weeks AS (
 			     SELECT date_trunc('week', seen_at) AS wk
-			       FROM login_events WHERE user_id = $1
+			       FROM login_events WHERE user_id = $1 AND seen_at >= $2
 			     UNION
 			     SELECT date_trunc('week', acted_at)
-			       FROM summary_actions WHERE user_id = $1
+			       FROM summary_actions WHERE user_id = $1 AND acted_at >= $2
 			 )
-			 SELECT count(DISTINCT wk) FROM weeks`, userID).Scan(&res.ActiveWeeks); err != nil {
+			 SELECT count(DISTINCT wk) FROM weeks`, userID, since).Scan(&res.ActiveWeeks); err != nil {
 			return fmt.Errorf("store: count active weeks: %w", err)
 		}
 		if err := tx.QueryRow(ctx,

internal/adapters/store/report_test.go

@@ -3,6 +3,7 @@ package store_test
 import (
 	"context"
 	"testing"
+	"time"
 
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/stretchr/testify/require"
@@ -54,7 +55,7 @@ func TestActiveWeeksCountsDistinctWeeksAcrossReadsAndActs(t *testing.T) {
 		   ($1, 'vid-2', 'saved',   '2026-01-19T18:00:00Z')`, userA)
 	require.NoError(t, err)
 
-	got, err := s.ActiveWeeks(ctx)
+	got, err := s.ActiveWeeks(ctx, time.Time{}) // zero since = no lower bound
 	require.NoError(t, err)
 	require.Len(t, got, 2, "both identity users must appear")
 
@@ -72,7 +73,33 @@ func TestActiveWeeksEmptyWhenNoUsers(t *testing.T) {
 	s := newStore(t)
 	resetDB(t, rawPool(t))
 
-	got, err := s.ActiveWeeks(ctx)
+	got, err := s.ActiveWeeks(ctx, time.Time{})
 	require.NoError(t, err)
 	require.Empty(t, got)
 }
+
+// TestActiveWeeksExcludesBeforeGateStart proves the baseline cutoff: activity
+// before `since` does not count, so pre-launch noise (testing, the pilot's blocked
+// period) is excluded from the Stage-0 return-usage gate (ADR-016).
+func TestActiveWeeksExcludesBeforeGateStart(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	p := rawPool(t)
+	resetDB(t, p)
+
+	seedReportUser(t, p, userA, "subject-a", "Ada")
+
+	// One read well before the baseline, two reads in distinct weeks after it.
+	_, err := p.Exec(ctx,
+		`INSERT INTO login_events (user_id, seen_at) VALUES
+		   ($1, '2026-05-01T09:00:00Z'),
+		   ($1, '2026-06-12T09:00:00Z'),
+		   ($1, '2026-06-19T09:00:00Z')`, userA)
+	require.NoError(t, err)
+
+	since := time.Date(2026, 6, 11, 0, 0, 0, 0, time.UTC)
+	got, err := s.ActiveWeeks(ctx, since)
+	require.NoError(t, err)
+	require.Len(t, got, 1)
+	require.Equal(t, 2, got[0].ActiveWeeks, "only the two post-baseline weeks count; the May read is excluded")
+}

internal/adapters/store/rls_test.go

@@ -22,9 +22,11 @@ import (
 // (no GUC set → zero rows) proves the enforcement path is live, not bypassed.
 
 // userIsolatedTables are the tables that carry a user_id and whose policy keys
-// directly off the tapir.current_user_id GUC.
+// directly off the tapir.current_user_id GUC. transcripts is deliberately ABSENT
+// — ADR-021 made it shared public content (non-RLS); TestTranscriptsTableIsSharedNotRLS
+// proves that is the only place the isolation boundary moved.
 var userIsolatedTables = []string{
-	"users", "videos", "transcripts", "summaries", "summary_actions", "login_events", "video_connections",
+	"users", "videos", "summaries", "summary_actions", "login_events", "video_connections",
 }
 
 // allIsolatedTables adds sink_deliveries, whose ownership is derived from its
@@ -38,9 +40,10 @@ type seeded struct {
 	summaryID string
 }
 
-// seedUser inserts one full chain (user → video → transcript → summary →
-// action → delivery) as the superuser pool, which bypasses RLS so both users'
-// data lands regardless of the GUC.
+// seedUser inserts one full chain (user → video → summary → action → delivery)
+// as the superuser pool, which bypasses RLS so both users' data lands regardless
+// of the GUC. Transcripts are NOT seeded here: they are shared, non-RLS public
+// content (ADR-021), so they have no place in a per-user isolation chain.
 func seedUser(t *testing.T, p *pgxpool.Pool, userID string) seeded {
 	t.Helper()
 	ctx := context.Background()
@@ -54,11 +57,6 @@ func seedUser(t *testing.T, p *pgxpool.Pool, userID string) seeded {
 		 VALUES ($1, 'youtube', $2, 'title') RETURNING id`,
 		userID, "vid-"+userID).Scan(&videoID))
 
-	_, err = p.Exec(ctx,
-		`INSERT INTO transcripts (video_id, user_id, source, content)
-		 VALUES ($1, $2, 'captions', 'words')`, videoID, userID)
-	require.NoError(t, err)
-
 	var summaryID string
 	require.NoError(t, p.QueryRow(ctx,
 		`INSERT INTO summaries (user_id, video_id, summary) VALUES ($1, $2, 'sum')
@@ -92,9 +90,16 @@ func appPool(t *testing.T, super *pgxpool.Pool) *pgxpool.Pool {
 	t.Helper()
 	ctx := context.Background()
 
-	// Idempotent across test runs (schema/role persist for the TestMain PG).
-	_, _ = super.Exec(ctx, `DROP ROLE IF EXISTS app`)
-	_, err := super.Exec(ctx, `CREATE ROLE app LOGIN PASSWORD 'app'`)
+	// Idempotent across tests AND runs: the role persists for the TestMain PG and
+	// owns granted privileges, so a plain DROP ROLE fails once any GRANT exists
+	// (and more than one test now builds an app pool). Create only if absent; the
+	// GRANTs below are themselves idempotent.
+	_, err := super.Exec(ctx,
+		`DO $$ BEGIN
+		    IF NOT EXISTS (SELECT FROM pg_roles WHERE rolname = 'app') THEN
+		        CREATE ROLE app LOGIN PASSWORD 'app';
+		    END IF;
+		 END $$`)
 	require.NoError(t, err)
 	_, err = super.Exec(ctx, `GRANT USAGE ON SCHEMA public TO app`)
 	require.NoError(t, err)
@@ -186,7 +191,6 @@ func TestRLSEnforcesPerUserIsolation(t *testing.T) {
 		{"update users", `UPDATE users SET display_name = 'hacked' WHERE id = $1`, b.userID},
 		{"update videos", `UPDATE videos SET title = 'hacked' WHERE user_id = $1`, b.userID},
 		{"queue videos summarize", `UPDATE videos SET summarize_requested = TRUE WHERE id = $1`, b.videoID},
-		{"update transcripts", `UPDATE transcripts SET content = 'hacked' WHERE user_id = $1`, b.userID},
 		{"update summaries", `UPDATE summaries SET summary = 'hacked' WHERE user_id = $1`, b.userID},
 		{"update summary_actions", `UPDATE summary_actions SET action = 'skipped' WHERE user_id = $1`, b.userID},
 		{"update login_events", `UPDATE login_events SET seen_at = NOW() WHERE user_id = $1`, b.userID},
@@ -235,3 +239,55 @@ func TestRLSEnforcesPerUserIsolation(t *testing.T) {
 
 	_ = a // a's ids are seeded for the symmetric read assertions above
 }
+
+// TestTranscriptsTableIsSharedNotRLS is the ADR-021 isolation proof: transcripts
+// is the ONE shared, non-RLS surface, and the public-content classification
+// leaked to nothing else. It is the inverse of TestRLSEnforcesPerUserIsolation —
+// where that asserts deny-all on every user-owned table, this asserts transcripts
+// is readable and writable with no user scope at all, holds no user_id, and is
+// the single table with row-level security switched off.
+func TestTranscriptsTableIsSharedNotRLS(t *testing.T) {
+	newStore(t)
+	super := rawPool(t)
+	resetDB(t, super)
+	app := appPool(t, super)
+	ctx := context.Background()
+
+	// 1. Shared + non-RLS: with NO GUC set, the app role both writes and reads a
+	//    transcript. On an RLS table this would be deny-all (zero rows), exactly as
+	//    the main isolation test asserts for every user-owned table.
+	_, err := app.Exec(ctx,
+		`INSERT INTO transcripts (provider, provider_video_id, source, content)
+		 VALUES ('youtube', 'shared-vid', 'captions', 'public words')`)
+	require.NoError(t, err, "app role must write shared transcript content with no user scope")
+	require.Equal(t, 1, scopedCount(t, app, "", "transcripts"),
+		"transcripts must be readable with NO user scope — it is shared, non-RLS (ADR-021)")
+
+	// 2. No user_id column: the table holds only public caption content + the
+	//    video's public id, nothing user-identifying.
+	var hasUserID bool
+	require.NoError(t, super.QueryRow(ctx,
+		`SELECT EXISTS (SELECT 1 FROM information_schema.columns
+		                 WHERE table_name = 'transcripts' AND column_name = 'user_id')`).Scan(&hasUserID))
+	require.False(t, hasUserID, "transcripts must carry no user_id (ADR-021 public content)")
+
+	// 3. The boundary is EXACTLY here: every user-owned table still has row-level
+	//    security enabled; transcripts alone has it off. This is the proof the
+	//    non-RLS classification was applied to transcripts and leaked nowhere else.
+	for _, table := range allIsolatedTables {
+		require.True(t, rlsEnabled(t, super, table),
+			"%s must still enforce row-level security — isolation must not have regressed", table)
+	}
+	require.False(t, rlsEnabled(t, super, "transcripts"),
+		"transcripts must be the single table with row-level security OFF (the one shared surface)")
+}
+
+// rlsEnabled reports whether a public table has ROW LEVEL SECURITY enabled.
+func rlsEnabled(t *testing.T, p *pgxpool.Pool, table string) bool {
+	t.Helper()
+	var enabled bool
+	require.NoError(t, p.QueryRow(context.Background(),
+		`SELECT relrowsecurity FROM pg_class
+		  WHERE relname = $1 AND relnamespace = 'public'::regnamespace`, table).Scan(&enabled))
+	return enabled
+}

internal/adapters/store/store.go

@@ -24,7 +24,7 @@ import (
 
 	_ "github.com/jackc/pgx/v5/stdlib" // register the "pgx" database/sql driver for migrate
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 //go:embed migrations/*.sql

internal/adapters/store/store_test.go

@@ -4,15 +4,16 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"path/filepath"
 	"testing"
 
 	embeddedpostgres "github.com/fergusstrange/embedded-postgres"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
 // Static check: Store satisfies the Sink port.
@@ -24,11 +25,22 @@ var _ ports.Sink = (*store.Store)(nil)
 var dsn string
 
 func TestMain(m *testing.M) {
-	const port = 54329
+	// Port + runtime/data dirs are per-process (PID-derived) so two concurrent
+	// `go test` invocations — e.g. a push-run and a tag-run firing together in CI —
+	// don't collide on a fixed port or a shared data dir (which silently failed
+	// both runs). CachePath is shared so the PG archive is downloaded once, not
+	// per process. Base 54000 keeps this package's range distinct from web's.
+	port := uint32(54000 + os.Getpid()%1000)
 	dsn = fmt.Sprintf("postgres://postgres:postgres@localhost:%d/postgres?sslmode=disable", port)
 
+	rt := filepath.Join(os.TempDir(), fmt.Sprintf("tapir-epg-store-%d", os.Getpid()))
 	pg := embeddedpostgres.NewDatabase(
-		embeddedpostgres.DefaultConfig().Port(port),
+		embeddedpostgres.DefaultConfig().
+			Port(port).
+			RuntimePath(rt).
+			DataPath(filepath.Join(rt, "data")).
+			BinariesPath(filepath.Join(rt, "bin")).
+			CachePath(filepath.Join(os.TempDir(), "tapir-epg-cache")),
 	)
 	if err := pg.Start(); err != nil {
 		fmt.Fprintf(os.Stderr, "embedded-postgres start: %v\n", err)
@@ -40,6 +52,7 @@ func TestMain(m *testing.M) {
 	if err := pg.Stop(); err != nil {
 		fmt.Fprintf(os.Stderr, "embedded-postgres stop: %v\n", err)
 	}
+	_ = os.RemoveAll(rt)
 	os.Exit(code)
 }
 

internal/adapters/store/summarize_mode_test.go

@@ -8,7 +8,7 @@ import (
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // seedBareVideo inserts a videos row with no summary, so the all-videos read and

internal/adapters/store/transcript.go

@@ -0,0 +1,66 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/jackc/pgx/v5"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
+)
+
+// GetTranscript returns the shared, stored transcript for a video keyed by the
+// cross-user dedup key (provider, providerVideoID), and whether one exists
+// (ADR-021). It reads via the raw pool, NOT withUser: the table holds public
+// content with no user_id and no RLS policy, so it is shared across users by
+// construction. A stored SourceNone is a real hit (ok == true, HasText() ==
+// false) — a known caption-less video, so the caller skips without re-fetching.
+func (s *Store) GetTranscript(ctx context.Context, provider, providerVideoID string) (domain.Transcript, bool, error) {
+	var source, lang, content string
+	err := s.pool.QueryRow(ctx,
+		`SELECT source, COALESCE(language, ''), COALESCE(content, '')
+		   FROM transcripts WHERE provider = $1 AND provider_video_id = $2`,
+		provider, providerVideoID).Scan(&source, &lang, &content)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return domain.Transcript{}, false, nil
+	}
+	if err != nil {
+		return domain.Transcript{}, false, fmt.Errorf("store: get transcript: %w", err)
+	}
+	return domain.Transcript{
+		Source:   domain.TranscriptSource(source),
+		Language: lang,
+		Content:  content,
+	}, true, nil
+}
+
+// SaveTranscript upserts the shared transcript for (provider, providerVideoID).
+// Only terminal outcomes belong here: SourceCaptions (with text) or SourceNone
+// (no captions). A transient SourceRateLimited is rejected so persistence never
+// masks a 429 as a permanent absence — that stays a per-user retry (ADR-014).
+// Last write wins on conflict (a later re-fetch may correct an entry). It writes
+// via the raw pool, NOT withUser — public content, shared, non-RLS (ADR-021).
+func (s *Store) SaveTranscript(ctx context.Context, provider, providerVideoID string, t domain.Transcript) error {
+	switch t.Source {
+	case domain.SourceCaptions, domain.SourceNone:
+		// terminal — persist
+	case domain.SourceRateLimited:
+		return fmt.Errorf("store: refusing to persist transient rate-limited transcript for %s/%s", provider, providerVideoID)
+	default:
+		return fmt.Errorf("store: invalid transcript source %q", t.Source)
+	}
+	_, err := s.pool.Exec(ctx,
+		`INSERT INTO transcripts (provider, provider_video_id, source, language, content)
+		      VALUES ($1, $2, $3, NULLIF($4, ''), NULLIF($5, ''))
+		 ON CONFLICT (provider, provider_video_id)
+		 DO UPDATE SET source     = EXCLUDED.source,
+		               language   = EXCLUDED.language,
+		               content    = EXCLUDED.content,
+		               fetched_at = NOW()`,
+		provider, providerVideoID, string(t.Source), t.Language, t.Content)
+	if err != nil {
+		return fmt.Errorf("store: save transcript: %w", err)
+	}
+	return nil
+}

internal/adapters/store/transcript_status_test.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 func TestSetTranscriptStatus_RoundTrip(t *testing.T) {

internal/adapters/store/transcript_test.go

@@ -0,0 +1,87 @@
+package store_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
+)
+
+// Static check: Store satisfies the shared TranscriptStore port (ADR-021).
+var _ ports.TranscriptStore = (*store.Store)(nil)
+
+func TestSaveAndGetTranscript_RoundTrip(t *testing.T) {
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+	ctx := context.Background()
+
+	want := domain.Transcript{Source: domain.SourceCaptions, Language: "en", Content: "the words"}
+	require.NoError(t, s.SaveTranscript(ctx, "youtube", "vid-1", want))
+
+	got, ok, err := s.GetTranscript(ctx, "youtube", "vid-1")
+	require.NoError(t, err)
+	require.True(t, ok, "a saved transcript must be found")
+	require.Equal(t, domain.SourceCaptions, got.Source)
+	require.Equal(t, "en", got.Language)
+	require.Equal(t, "the words", got.Content)
+	require.True(t, got.HasText())
+}
+
+func TestGetTranscript_Miss(t *testing.T) {
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+
+	_, ok, err := s.GetTranscript(context.Background(), "youtube", "absent")
+	require.NoError(t, err, "a miss is not an error")
+	require.False(t, ok)
+}
+
+// A stored "no captions" outcome is a real hit: callers must skip without
+// re-fetching, so ok is true even though there is no text (ADR-021 / ADR-007).
+func TestSaveAndGetTranscript_NoneIsAStoredHit(t *testing.T) {
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+	ctx := context.Background()
+
+	require.NoError(t, s.SaveTranscript(ctx, "youtube", "vid-none", domain.Transcript{Source: domain.SourceNone}))
+
+	got, ok, err := s.GetTranscript(ctx, "youtube", "vid-none")
+	require.NoError(t, err)
+	require.True(t, ok, "a stored SourceNone is a hit, not a miss")
+	require.Equal(t, domain.SourceNone, got.Source)
+	require.False(t, got.HasText())
+}
+
+// A transient 429 must never be persisted as a terminal transcript, or a later
+// read would mask the rate-limit as a permanent "no transcript" (ADR-014).
+func TestSaveTranscript_RejectsRateLimited(t *testing.T) {
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+
+	err := s.SaveTranscript(context.Background(), "youtube", "vid-429",
+		domain.Transcript{Source: domain.SourceRateLimited})
+	require.Error(t, err)
+
+	_, ok, _ := s.GetTranscript(context.Background(), "youtube", "vid-429")
+	require.False(t, ok, "a rejected rate-limited save must leave nothing stored")
+}
+
+func TestSaveTranscript_UpsertLastWriteWins(t *testing.T) {
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+	ctx := context.Background()
+
+	require.NoError(t, s.SaveTranscript(ctx, "youtube", "vid-up", domain.Transcript{Source: domain.SourceNone}))
+	require.NoError(t, s.SaveTranscript(ctx, "youtube", "vid-up",
+		domain.Transcript{Source: domain.SourceCaptions, Language: "en", Content: "now resolved"}))
+
+	got, ok, err := s.GetTranscript(ctx, "youtube", "vid-up")
+	require.NoError(t, err)
+	require.True(t, ok)
+	require.Equal(t, domain.SourceCaptions, got.Source)
+	require.Equal(t, "now resolved", got.Content)
+}

internal/adapters/store/videos.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/jackc/pgx/v5"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // UpsertVideo persists a video's metadata and returns its durable store id (the
@@ -46,14 +46,16 @@ func (s *Store) UpsertVideo(ctx context.Context, v domain.Video) (string, error)
 		}
 
 		if err := tx.QueryRow(ctx,
-			`INSERT INTO videos (user_id, provider, provider_video_id, title, url, published_at)
-			 VALUES ($1, $2, $3, $4, $5, $6)
+			`INSERT INTO videos (user_id, provider, provider_video_id, title, url, published_at, channel_title, duration_s)
+			 VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
 			 ON CONFLICT (user_id, provider, provider_video_id) DO UPDATE SET
-			     title        = EXCLUDED.title,
-			     url          = EXCLUDED.url,
-			     published_at = EXCLUDED.published_at
+			     title         = EXCLUDED.title,
+			     url           = EXCLUDED.url,
+			     published_at  = EXCLUDED.published_at,
+			     channel_title = COALESCE(NULLIF(EXCLUDED.channel_title, ''), videos.channel_title),
+			     duration_s    = COALESCE(EXCLUDED.duration_s, videos.duration_s)
 			 RETURNING id`,
-			v.UserID, provider, v.ProviderVideoID, v.Title, v.URL, nullTime(v.PublishedAt),
+			v.UserID, provider, v.ProviderVideoID, v.Title, v.URL, nullTime(v.PublishedAt), v.ChannelTitle, nullDuration(v.DurationSeconds),
 		).Scan(&id); err != nil {
 			return fmt.Errorf("store: upsert video: %w", err)
 		}
@@ -73,12 +75,27 @@ func nullTime(t time.Time) *time.Time {
 	return &t
 }
 
-// NewestUnsummarizedVideoIDs returns up to limit of the user's videos that have
-// no summary yet, newest first (published_at DESC, NULLS LAST). It caps the
-// connect-time onboarding burst (Feature 1) at a fixed count: the caller marks
-// these for summarization through the shared rate gate. RLS-scoped via withUser,
-// so it only ever sees the requesting user's rows. limit <= 0 returns nil.
-func (s *Store) NewestUnsummarizedVideoIDs(ctx context.Context, userID string, limit int) ([]string, error) {
+// nullDuration maps an unknown duration (0) to SQL NULL so the upsert's
+// COALESCE(EXCLUDED.duration_s, videos.duration_s) preserves a previously-known
+// value instead of clobbering it with 0 (ADR-028; the channel_title backfill
+// stance, migration 014).
+func nullDuration(seconds int) *int {
+	if seconds <= 0 {
+		return nil
+	}
+	return &seconds
+}
+
+// OnboardBurstVideoIDs returns up to limit of the user's unsummarized videos for
+// the connect-time onboarding burst (ADR-028), newest-first but quality-aware: a
+// video is excluded when its duration is KNOWN and outside [minSeconds, maxSeconds]
+// — dropping Shorts (below min) and multi-hour livestream VODs (above max) that
+// would waste a scarce caption fetch on a poor first impression. A NULL/unknown
+// duration is kept (degrade-open) but ranked AFTER known-good rows, so a freshly
+// enriched good pick wins when both exist. minSeconds<=0 / maxSeconds<=0 each
+// disable that bound (0/0 == pure newest-first, the reversibility lever).
+// RLS-scoped via withUser; limit <= 0 returns nil.
+func (s *Store) OnboardBurstVideoIDs(ctx context.Context, userID string, limit, minSeconds, maxSeconds int) ([]string, error) {
 	if limit <= 0 {
 		return nil, nil
 	}
@@ -91,16 +108,21 @@ func (s *Store) NewestUnsummarizedVideoIDs(ctx context.Context, userID string, l
 			    AND NOT EXISTS (
 			          SELECT 1 FROM summaries su
 			           WHERE su.user_id = v.user_id AND su.video_id = v.id)
-			  ORDER BY v.published_at DESC NULLS LAST, v.seen_at DESC
-			  LIMIT $2`, userID, limit)
+			    AND NOT (
+			          v.duration_s IS NOT NULL
+			          AND ( ($3 > 0 AND v.duration_s < $3)
+			             OR ($4 > 0 AND v.duration_s > $4) ))
+			  ORDER BY (v.duration_s IS NOT NULL) DESC,
+			           v.published_at DESC NULLS LAST, v.seen_at DESC
+			  LIMIT $2`, userID, limit, minSeconds, maxSeconds)
 		if err != nil {
-			return fmt.Errorf("store: newest unsummarized: %w", err)
+			return fmt.Errorf("store: onboard burst videos: %w", err)
 		}
 		defer rows.Close()
 		for rows.Next() {
 			var id string
 			if err := rows.Scan(&id); err != nil {
-				return fmt.Errorf("store: scan newest unsummarized: %w", err)
+				return fmt.Errorf("store: scan onboard burst video: %w", err)
 			}
 			ids = append(ids, id)
 		}
@@ -110,3 +132,31 @@ func (s *Store) NewestUnsummarizedVideoIDs(ctx context.Context, userID string, l
 	}
 	return ids, nil
 }
+
+// DistinctChannels returns the user's distinct, non-empty source channel titles
+// (the channels they have videos from), alphabetically — the option list for the
+// feed's channel filter. RLS-scoped via withUser.
+func (s *Store) DistinctChannels(ctx context.Context, userID string) ([]string, error) {
+	var out []string
+	if err := s.withUser(ctx, userID, func(tx pgx.Tx) error {
+		rows, err := tx.Query(ctx,
+			`SELECT DISTINCT channel_title FROM videos
+			  WHERE user_id = $1 AND channel_title IS NOT NULL AND channel_title <> ''
+			  ORDER BY channel_title`, userID)
+		if err != nil {
+			return fmt.Errorf("store: distinct channels: %w", err)
+		}
+		defer rows.Close()
+		for rows.Next() {
+			var c string
+			if err := rows.Scan(&c); err != nil {
+				return fmt.Errorf("store: scan channel: %w", err)
+			}
+			out = append(out, c)
+		}
+		return rows.Err()
+	}); err != nil {
+		return nil, err
+	}
+	return out, nil
+}

internal/adapters/store/videos_test.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 func ytVideo(userID, provVideoID, title string) domain.Video {
@@ -52,6 +52,36 @@ func TestUpsertVideo_ReturnsStableID(t *testing.T) {
 	require.Equal(t, 1, count, "must not duplicate the row")
 }
 
+func TestUpsertVideo_PersistsAndPreservesDuration(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+
+	// First upsert carries a known duration (ADR-028: discovery enriches it).
+	v := ytVideo(userA, "dur0000001x", "with duration")
+	v.DurationSeconds = 750
+	id, err := s.UpsertVideo(ctx, v)
+	require.NoError(t, err)
+
+	p := rawPool(t)
+	readDuration := func() *int {
+		var d *int
+		require.NoError(t, p.QueryRow(ctx, `SELECT duration_s FROM videos WHERE id = $1`, id).Scan(&d))
+		return d
+	}
+	require.NotNil(t, readDuration())
+	require.Equal(t, 750, *readDuration(), "duration must persist")
+
+	// A later upsert that does NOT know the duration (0) must not clobber it —
+	// the channel_title backfill stance (migration 014): COALESCE-preserve.
+	v2 := ytVideo(userA, "dur0000001x", "title updated, duration unknown")
+	v2.DurationSeconds = 0
+	_, err = s.UpsertVideo(ctx, v2)
+	require.NoError(t, err)
+	require.NotNil(t, readDuration(), "a 0/unknown re-upsert must not erase a known duration")
+	require.Equal(t, 750, *readDuration())
+}
+
 func TestUpsertVideo_IDMatchesSummaryDedup(t *testing.T) {
 	ctx := context.Background()
 	s := newStore(t)
@@ -82,34 +112,79 @@ func TestUpsertVideo_PerUserIsolation(t *testing.T) {
 	require.NotEqual(t, idA, idB, "same provider video for two users must be two distinct rows")
 }
 
-func TestNewestUnsummarizedVideoIDs(t *testing.T) {
+func TestOnboardBurstVideoIDs(t *testing.T) {
 	ctx := context.Background()
 	s := newStore(t)
 	resetDB(t, rawPool(t))
 
-	mk := func(user, pid string, day int) string {
+	mk := func(user, pid string, day, dur int) string {
 		v := ytVideo(user, pid, pid)
 		v.PublishedAt = time.Date(2026, 6, day, 12, 0, 0, 0, time.UTC)
+		v.DurationSeconds = dur // 0 == unknown (NULL)
 		id, err := s.UpsertVideo(ctx, v)
 		require.NoError(t, err)
 		return id
 	}
 
-	_ = mk(userA, "a1vid000001", 1)
-	id2 := mk(userA, "a2vid000002", 2)
-	id3 := mk(userA, "a3vid000003", 3)
-	id4 := mk(userA, "a4vid000004", 4)
-	mk(userB, "b1vid000009", 9) // userB's newest — must never leak via RLS
+	summarized := mk(userA, "summ0000001", 6, 600) // newest known-good, but already summarized
+	good1 := mk(userA, "good0000001", 5, 600)      // 10m, newest UNsummarized known-good
+	tooLong := mk(userA, "toolong0001", 4, 20000)  // > maxSeconds -> dropped
+	tooShort := mk(userA, "tooshort001", 3, 30)    // < minSeconds -> dropped
+	unknown := mk(userA, "unknown0001", 2, 0)      // NULL duration -> kept, ranked last
+	good2 := mk(userA, "good0000002", 1, 800)      // known-good but oldest
+	mk(userB, "bvid0000009", 9, 600)               // userB -> must not leak via RLS
 
-	// The newest (v4) is summarized, so it's excluded from "unsummarized".
-	require.NoError(t, s.Deliver(ctx, summary(userA, id4, "done")))
+	// The newest video is summarized, so it is excluded from the burst.
+	require.NoError(t, s.Deliver(ctx, summary(userA, summarized, "done")))
 
-	// Cap 2, newest-first unsummarized: v3 then v2 (v4 excluded; userB excluded).
-	got, err := s.NewestUnsummarizedVideoIDs(ctx, userA, 2)
+	const minSec, maxSec = 60, 14400
+
+	// Known-good ranked before unknown, each newest-first within its group; the
+	// too-long and too-short videos are excluded by their known duration.
+	got, err := s.OnboardBurstVideoIDs(ctx, userA, 5, minSec, maxSec)
 	require.NoError(t, err)
-	require.Equal(t, []string{id3, id2}, got)
+	require.Equal(t, []string{good1, good2, unknown}, got,
+		"known-good first (newest-first), then unknown-duration; junk excluded")
 
-	none, err := s.NewestUnsummarizedVideoIDs(ctx, userA, 0)
+	// Cap is honoured.
+	capped, err := s.OnboardBurstVideoIDs(ctx, userA, 2, minSec, maxSec)
 	require.NoError(t, err)
-	require.Empty(t, none, "limit 0 returns nothing")
+	require.Equal(t, []string{good1, good2}, capped)
+
+	// Bounds disabled (0/0) == pure newest-first, nothing excluded.
+	all, err := s.OnboardBurstVideoIDs(ctx, userA, 10, 0, 0)
+	require.NoError(t, err)
+	require.ElementsMatch(t, []string{good1, tooLong, tooShort, unknown, good2}, all,
+		"0/0 bounds disable the duration filter (prior newest-first behaviour)")
+
+	// limit <= 0 returns nothing.
+	none, err := s.OnboardBurstVideoIDs(ctx, userA, 0, minSec, maxSec)
+	require.NoError(t, err)
+	require.Empty(t, none)
+}
+
+func TestUpsertVideoPersistsChannelAndDistinctChannels(t *testing.T) {
+	ctx := context.Background()
+	s := newStore(t)
+	resetDB(t, rawPool(t))
+
+	mk := func(pid, channel string) {
+		v := ytVideo(userA, pid, pid)
+		v.ChannelTitle = channel
+		_, err := s.UpsertVideo(ctx, v)
+		require.NoError(t, err)
+	}
+	mk("aa11111aaaa", "Acme Talks")
+	mk("bb22222bbbb", "Acme Talks") // same channel
+	mk("cc33333cccc", "Zeta Channel")
+	// userB's channel must not leak.
+	vb := ytVideo(userB, "dd44444dddd", "x")
+	vb.ChannelTitle = "Bravo Only"
+	_, err := s.UpsertVideo(ctx, vb)
+	require.NoError(t, err)
+
+	got, err := s.DistinctChannels(ctx, userA)
+	require.NoError(t, err)
+	require.Equal(t, []string{"Acme Talks", "Zeta Channel"}, got,
+		"distinct, alphabetical, user-scoped (no Bravo Only)")
 }

internal/adapters/summarizer/summarizer.go

@@ -1,19 +1,25 @@
 // Package summarizer implements ports.Summarizer backed by the copied llm
-// package's local-Primary -> BYO-Fallback routing (ADR-004). It is the only
-// place content ever leaves the engine toward an AI model, so it is also the
-// enforcement point for the local-first guarantee in
-// docs/use-cases/ai_routing.feature: a user with no BYO provider configured has
-// their content sent to the local stack and nowhere else.
+// package's routing (ADR-004, extended by ADR-022). It is the only place content
+// ever leaves the engine toward an AI model, so it is also the enforcement point
+// for the local-first guarantee in docs/use-cases/ai_routing.feature: endpoints
+// are tried in order, locals first, so content only reaches an external model
+// after every local endpoint has failed — and never at all when no external
+// endpoint is configured.
 package summarizer
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"log/slog"
 	"strings"
 	"time"
+	"unicode/utf8"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
 )
 
 // Completer is the minimal LLM chat surface the Summarizer needs.
@@ -29,19 +35,41 @@ type Endpoint struct {
 	Model    string // resolved alias, e.g. "iguana/deepseek-r1-14b"
 }
 
-// Summarizer routes a transcript through the local endpoint first, then the
-// optional BYO endpoint. It owns its routing (rather than delegating to
-// llm.Router) so it can record which provider answered and whether the fallback
-// was used — information llm.Router collapses away.
+// Summarizer routes a transcript through an ordered chain of endpoints, trying
+// each in turn until one returns a parseable summary. It owns its routing
+// (rather than delegating to llm.Router) so it can record which provider answered
+// and whether a fallback was used — information llm.Router collapses away. The
+// chain ordering is the local-first guarantee: callers place local endpoints
+// first and any external endpoint last, so content only reaches an external model
+// after every local endpoint has failed.
 type Summarizer struct {
-	primary  Endpoint
-	fallback *Endpoint // nil => no BYO; primary errors are returned, never sent externally
-	now      func() time.Time
+	endpoints     []Endpoint
+	maxInputChars int // transcript truncation budget; 0 = no limit
+	now           func() time.Time
 }
 
-// New constructs a Summarizer. fallback may be nil (no BYO provider configured).
+// New constructs a Summarizer from a primary endpoint and an optional fallback
+// (the historical local-Primary -> BYO-Fallback shape, ADR-004). A nil fallback
+// means a single-endpoint chain: errors are returned, content never leaves it.
 func New(primary Endpoint, fallback *Endpoint) *Summarizer {
-	return &Summarizer{primary: primary, fallback: fallback, now: time.Now}
+	eps := []Endpoint{primary}
+	if fallback != nil {
+		eps = append(eps, *fallback)
+	}
+	return &Summarizer{endpoints: eps, now: time.Now}
+}
+
+// NewChain constructs a Summarizer over an ordered endpoint chain (ADR-022).
+// endpoints are tried in order; the first to return a parseable summary wins, and
+// FallbackUsed is recorded true for any endpoint past the first. maxInputChars
+// bounds the transcript text sent to every endpoint (0 = unbounded), so a long
+// transcript does not overflow a small-context primary model's window. It panics
+// on an empty chain — a wiring bug, not a runtime condition.
+func NewChain(endpoints []Endpoint, maxInputChars int) *Summarizer {
+	if len(endpoints) == 0 {
+		panic("summarizer: NewChain requires at least one endpoint")
+	}
+	return &Summarizer{endpoints: endpoints, maxInputChars: maxInputChars, now: time.Now}
 }
 
 const systemPrompt = `You are Tapir, a video-summarization assistant.
@@ -53,31 +81,42 @@ Respond with ONLY a JSON object, no prose and no code fences:
 - "takeaways": the actionable conclusions a viewer should leave with.
 Output the JSON object and nothing else.`
 
-// Summarize implements ports.Summarizer.
+// Summarize implements ports.Summarizer. It walks the endpoint chain in order:
+// the first endpoint whose reply parses into a non-empty summary wins. An
+// endpoint is considered failed — and the next one tried — when the model call
+// errors OR when its reply cannot be parsed (a 200 with malformed JSON or a
+// highlights field the model emitted as a bare string). Truncation is applied
+// once, up front, so every endpoint sees the same bounded prompt. When the whole
+// chain fails, the joined error is returned so the engine queues the work for
+// retry and delivers no summary.
 func (s *Summarizer) Summarize(ctx context.Context, v domain.Video, t domain.Transcript) (domain.Summary, error) {
 	if !t.HasText() {
 		return domain.Summary{}, fmt.Errorf("summarize: transcript for video %s has no text", v.ID)
 	}
-	user := buildUserPrompt(v, t)
+	user := buildUserPrompt(v, t, s.maxInputChars)
 
-	// Primary = local stack. Only on its failure is anything sent externally,
-	// and only when a BYO fallback is configured.
-	out, err := s.primary.Client.Complete(ctx, systemPrompt, user)
-	if err == nil {
-		return s.build(v, s.primary, false, out)
+	var errs []error
+	for i, ep := range s.endpoints {
+		fallback := i > 0
+		start := time.Now()
+		out, err := ep.Client.Complete(ctx, systemPrompt, user)
+		dur := time.Since(start)
+		if err != nil {
+			metrics.ObserveSummarize(ep.Model, "error", fallback, dur)
+			errs = append(errs, fmt.Errorf("%s/%s call: %w", ep.Provider, ep.Model, err))
+			continue
+		}
+		sum, perr := s.build(v, ep, fallback, out)
+		if perr != nil {
+			metrics.ObserveSummarize(ep.Model, "parse_error", fallback, dur)
+			errs = append(errs, fmt.Errorf("%s/%s output: %w", ep.Provider, ep.Model, perr))
+			continue
+		}
+		metrics.ObserveSummarize(ep.Model, "success", fallback, dur)
+		slog.Default().Info("summarized", "model", ep.Model, "fallback", fallback, "elapsed_ms", dur.Milliseconds())
+		return sum, nil
 	}
-
-	if s.fallback == nil {
-		// No BYO: content was sent to the local stack only. Surface the error so
-		// the engine can queue the work for retry; deliver no summary.
-		return domain.Summary{}, fmt.Errorf("summarize: local AI failed and no BYO provider configured: %w", err)
-	}
-
-	out, ferr := s.fallback.Client.Complete(ctx, systemPrompt, user)
-	if ferr != nil {
-		return domain.Summary{}, fmt.Errorf("summarize: local AI failed: %w; BYO %s failed: %v", err, s.fallback.Provider, ferr)
-	}
-	return s.build(v, *s.fallback, true, out)
+	return domain.Summary{}, fmt.Errorf("summarize: all %d endpoint(s) failed: %w", len(s.endpoints), errors.Join(errs...))
 }
 
 func (s *Summarizer) build(v domain.Video, ep Endpoint, fallbackUsed bool, raw string) (domain.Summary, error) {
@@ -89,8 +128,8 @@ func (s *Summarizer) build(v domain.Video, ep Endpoint, fallbackUsed bool, raw s
 		UserID:       v.UserID,
 		VideoID:      v.ID,
 		Summary:      parsed.Summary,
-		Highlights:   parsed.Highlights,
-		Takeaways:    parsed.Takeaways,
+		Highlights:   []string(parsed.Highlights),
+		Takeaways:    []string(parsed.Takeaways),
 		AIProvider:   ep.Provider,
 		AIModel:      ep.Model,
 		FallbackUsed: fallbackUsed,
@@ -98,20 +137,94 @@ func (s *Summarizer) build(v domain.Video, ep Endpoint, fallbackUsed bool, raw s
 	}, nil
 }
 
-func buildUserPrompt(v domain.Video, t domain.Transcript) string {
+func buildUserPrompt(v domain.Video, t domain.Transcript, maxInputChars int) string {
 	var b strings.Builder
 	fmt.Fprintf(&b, "Title: %s\n", v.Title)
 	if v.URL != "" {
 		fmt.Fprintf(&b, "URL: %s\n", v.URL)
 	}
-	fmt.Fprintf(&b, "\nTranscript:\n%s", t.Content)
+	fmt.Fprintf(&b, "\nTranscript:\n%s", truncate(t.Content, maxInputChars))
 	return b.String()
 }
 
+// truncate caps content to max bytes on a UTF-8 rune boundary, appending a
+// marker so the model knows the transcript was cut. A non-positive max (or a
+// content already within budget) returns content unchanged. Bounding the input
+// keeps a long transcript from overflowing a small-context model's window — the
+// production failure mode where koala/phi4-mini's 8k context returned HTTP 400 on
+// a 11.6k-token transcript.
+func truncate(content string, max int) string {
+	if max <= 0 || len(content) <= max {
+		return content
+	}
+	cut := max
+	for cut > 0 && !utf8.RuneStart(content[cut]) {
+		cut--
+	}
+	return content[:cut] + "\n…[transcript truncated to fit the model context]"
+}
+
+// flexStrings is a []string that also unmarshals from a single JSON string or a
+// JSON array of scalars. Small local models (koala/phi4-mini) sometimes emit
+// "highlights": "one point" instead of an array, or mix in a number; rather than
+// fail the whole summary on that quirk, coerce to []string. Empty/whitespace
+// elements are dropped.
+type flexStrings []string
+
+func (f *flexStrings) UnmarshalJSON(b []byte) error {
+	b = bytes.TrimSpace(b)
+	if len(b) == 0 || string(b) == "null" {
+		*f = nil
+		return nil
+	}
+	if b[0] == '[' {
+		var raw []json.RawMessage
+		if err := json.Unmarshal(b, &raw); err != nil {
+			return err
+		}
+		out := make([]string, 0, len(raw))
+		for _, r := range raw {
+			s, err := rawToString(r)
+			if err != nil {
+				return err
+			}
+			if strings.TrimSpace(s) != "" {
+				out = append(out, s)
+			}
+		}
+		*f = out
+		return nil
+	}
+	s, err := rawToString(b)
+	if err != nil {
+		return err
+	}
+	if strings.TrimSpace(s) == "" {
+		*f = nil
+	} else {
+		*f = flexStrings{s}
+	}
+	return nil
+}
+
+// rawToString renders a JSON scalar as text: a quoted string is unquoted; any
+// other scalar (number, bool) is kept as its literal source so no content is lost.
+func rawToString(r json.RawMessage) (string, error) {
+	r = bytes.TrimSpace(r)
+	if len(r) > 0 && r[0] == '"' {
+		var s string
+		if err := json.Unmarshal(r, &s); err != nil {
+			return "", err
+		}
+		return s, nil
+	}
+	return string(r), nil
+}
+
 type parsedSummary struct {
-	Summary    string   `json:"summary"`
-	Highlights []string `json:"highlights"`
-	Takeaways  []string `json:"takeaways"`
+	Summary    string      `json:"summary"`
+	Highlights flexStrings `json:"highlights"`
+	Takeaways  flexStrings `json:"takeaways"`
 }
 
 // parse extracts the JSON object from a model reply. Thinking models (qwen3,

internal/adapters/summarizer/summarizer_test.go

@@ -7,13 +7,36 @@ package summarizer
 import (
 	"context"
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"strings"
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
+// TestSummarizerRecordsMetric verifies the summarizer→metrics wiring (ADR-030)
+// black-box: after a successful summarize, the public /metrics scrape shows a
+// success observation for that endpoint's model.
+func TestSummarizerRecordsMetric(t *testing.T) {
+	const model = "metrics-test-model"
+	s := New(Endpoint{Client: &fakeClient{reply: goodReply}, Provider: "local", Model: model}, nil)
+	if _, err := s.Summarize(context.Background(), testVideo(), testTranscript()); err != nil {
+		t.Fatalf("Summarize: %v", err)
+	}
+
+	rec := httptest.NewRecorder()
+	metrics.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/metrics", nil))
+	body := rec.Body.String()
+	if !strings.Contains(body, `tapir_summarize_duration_seconds`) ||
+		!strings.Contains(body, `model="`+model+`"`) ||
+		!strings.Contains(body, `outcome="success"`) {
+		t.Errorf("metrics scrape missing summarize success for %s", model)
+	}
+}
+
 // compile-time check: Summarizer satisfies the port.
 var _ ports.Summarizer = (*Summarizer)(nil)
 
@@ -129,8 +152,8 @@ func TestSummarize_NoBYO_ContentOnlyLocal(t *testing.T) {
 	local := &fakeClient{reply: goodReply}
 	s := New(Endpoint{Client: local, Provider: "local", Model: "iguana/deepseek-r1-14b"}, nil)
 
-	if s.fallback != nil {
-		t.Fatal("no BYO configured but fallback endpoint is non-nil")
+	if len(s.endpoints) != 1 {
+		t.Fatalf("no BYO configured but chain has %d endpoints, want 1", len(s.endpoints))
 	}
 	for i := 0; i < 3; i++ {
 		sum, err := s.Summarize(context.Background(), testVideo(), testTranscript())
@@ -176,3 +199,97 @@ func TestParse_EmptySummaryRejected(t *testing.T) {
 		t.Fatal("want error for empty summary (thinking model returned no content)")
 	}
 }
+
+// parse tolerates a small model emitting "highlights" as a bare string instead
+// of an array — the production koala/phi4-mini quirk that errored with
+// "cannot unmarshal string into Go struct field ... highlights of type []string".
+func TestParse_ToleratesStringHighlights(t *testing.T) {
+	p, err := parse(`{"summary":"s","highlights":"one big point","takeaways":["a","b"]}`)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if len(p.Highlights) != 1 || p.Highlights[0] != "one big point" {
+		t.Errorf("highlights = %v, want [\"one big point\"]", p.Highlights)
+	}
+	if len(p.Takeaways) != 2 {
+		t.Errorf("takeaways = %v, want 2", p.Takeaways)
+	}
+}
+
+// Chain: an endpoint that returns a 200 with unparseable output is treated as a
+// failure, and the next endpoint in the chain is tried. This is the case the old
+// primary->fallback shape missed — a parse error short-circuited instead of
+// falling back.
+func TestSummarize_FallsBackOnMalformedOutput(t *testing.T) {
+	bad := &fakeClient{reply: `{"summary": not json`}
+	good := &fakeClient{reply: goodReply}
+	s := NewChain([]Endpoint{
+		{Client: bad, Provider: "local", Model: "koala/phi4-mini"},
+		{Client: good, Provider: "local", Model: "koala/phi4-14b"},
+	}, 0)
+
+	sum, err := s.Summarize(context.Background(), testVideo(), testTranscript())
+	if err != nil {
+		t.Fatalf("Summarize: %v", err)
+	}
+	if sum.AIModel != "koala/phi4-14b" {
+		t.Errorf("AIModel = %q, want koala/phi4-14b (fell back past malformed primary)", sum.AIModel)
+	}
+	if !sum.FallbackUsed {
+		t.Error("FallbackUsed = false, want true")
+	}
+	if bad.calls != 1 || good.calls != 1 {
+		t.Errorf("calls: bad=%d good=%d, want 1 and 1", bad.calls, good.calls)
+	}
+}
+
+// Chain: when every endpoint fails, no summary is produced and the joined error
+// names each failure so the engine queues the work for retry.
+func TestSummarize_ChainAllEndpointsFail(t *testing.T) {
+	a := &fakeClient{err: errors.New("context overflow")}
+	b := &fakeClient{reply: "not even json"}
+	s := NewChain([]Endpoint{
+		{Client: a, Provider: "local", Model: "m1"},
+		{Client: b, Provider: "berget", Model: "m2"},
+	}, 0)
+
+	if _, err := s.Summarize(context.Background(), testVideo(), testTranscript()); err == nil {
+		t.Fatal("want error when all endpoints fail")
+	}
+	if a.calls != 1 || b.calls != 1 {
+		t.Errorf("calls: a=%d b=%d, want 1 and 1", a.calls, b.calls)
+	}
+}
+
+// A transcript longer than the chain's input budget is truncated before it
+// reaches any model, so a small-context primary does not overflow its window.
+func TestSummarize_TruncatesLongTranscript(t *testing.T) {
+	local := &fakeClient{reply: goodReply}
+	const budget = 100
+	s := NewChain([]Endpoint{{Client: local, Provider: "local", Model: "m"}}, budget)
+
+	long := domain.Transcript{
+		VideoID: "vid-1", UserID: "user-1", Source: domain.SourceCaptions,
+		Content: strings.Repeat("word ", 1000), // 5000 bytes, well over budget
+	}
+	if _, err := s.Summarize(context.Background(), testVideo(), long); err != nil {
+		t.Fatalf("Summarize: %v", err)
+	}
+	// The prompt carries title/URL framing plus the truncation marker, so allow
+	// headroom over the raw transcript budget — but it must be far below 5000.
+	if len(local.lastUser) > budget+300 {
+		t.Errorf("prompt length = %d, want <= %d (transcript not truncated)", len(local.lastUser), budget+300)
+	}
+	if !strings.Contains(local.lastUser, "truncated") {
+		t.Error("truncation marker missing from prompt")
+	}
+}
+
+func TestNewChain_PanicsOnEmptyChain(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Fatal("want panic on empty endpoint chain")
+		}
+	}()
+	NewChain(nil, 0)
+}

internal/adapters/youtube/captions.go

@@ -7,10 +7,13 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
+	"log/slog"
 	"net/http"
 	"strings"
+	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
 )
 
 // defaultPlayerBaseURL is the InnerTube / watch-page host. Overridable via
@@ -43,7 +46,35 @@ const maxCaptionBytes = 16 << 20 // 16 MiB
 // fetch, or an unparseable body all yield SourceNone rather than an error. Only
 // genuine transport (network) faults return an error. Audio download and
 // speech-to-text remain absent (ADR-007).
+// FetchTranscript times the caption fetch and records its latency by outcome
+// (ADR-030) before returning. Transport errors are surfaced to the caller and not
+// recorded as an outcome (logged upstream); the three resolved outcomes
+// captions|none|rate_limited are the ones that consume the scarce fetch budget.
 func (a *Adapter) FetchTranscript(ctx context.Context, v domain.Video) (domain.Transcript, error) {
+	start := time.Now()
+	tr, err := a.fetchTranscript(ctx, v)
+	if err == nil {
+		dur := time.Since(start)
+		outcome := captionOutcome(tr.Source)
+		metrics.ObserveCaptionFetch(outcome, dur)
+		slog.Default().Info("caption fetch", "video", v.ProviderVideoID, "outcome", outcome, "elapsed_ms", dur.Milliseconds())
+	}
+	return tr, err
+}
+
+// captionOutcome maps a transcript source to the metric outcome label.
+func captionOutcome(s domain.TranscriptSource) string {
+	switch s {
+	case domain.SourceCaptions:
+		return "captions"
+	case domain.SourceRateLimited:
+		return "rate_limited"
+	default:
+		return "none"
+	}
+}
+
+func (a *Adapter) fetchTranscript(ctx context.Context, v domain.Video) (domain.Transcript, error) {
 	client := a.plainClient()
 
 	tracks, err := a.captionTracks(ctx, client, v.ProviderVideoID)

internal/adapters/youtube/gate.go

@@ -2,6 +2,7 @@ package youtube
 
 import (
 	"context"
+	"sync/atomic"
 	"time"
 
 	"golang.org/x/time/rate"
@@ -29,9 +30,55 @@ func SetFetchRate(interval time.Duration) {
 	globalFetchGate = rate.NewLimiter(rate.Every(interval), 1)
 }
 
+// foregroundPending counts in-flight foreground (user-initiated) caption fetches.
+// The background sweep yields the gate while this is non-zero so a human waiting
+// on a click gets the next slot — and, on a near-throttled IP, the pre-429 window
+// — instead of competing equally with the firehose (ADR-026, Pillar A). Clicks are
+// rare and bursty, so background barely notices; the win to the click is large.
+var foregroundPending atomic.Int64
+
+// fgCtxKey marks a context as foreground (user-initiated). Unexported; set via
+// ForegroundContext and read via isForeground so only this package owns the key.
+type fgCtxKey struct{}
+
+// ForegroundContext marks ctx as a user-initiated (foreground) fetch so the gate
+// gives it priority. The web "Summarize"/paste/retry path wraps its context with
+// this; the background scheduler leaves it unset.
+func ForegroundContext(ctx context.Context) context.Context {
+	return context.WithValue(ctx, fgCtxKey{}, true)
+}
+
+func isForeground(ctx context.Context) bool {
+	v, _ := ctx.Value(fgCtxKey{}).(bool)
+	return v
+}
+
+// fgYieldPoll is how often a background waiter re-checks whether a foreground
+// fetch is still pending. Short enough to feel immediate, long enough not to spin.
+const fgYieldPoll = 200 * time.Millisecond
+
 // WaitFetchGate blocks until the process-wide gate allows one timedtext fetch,
 // respecting ctx cancellation. Called from httpDo before every live outbound
 // caption fetch so the scheduler and the click-path share the same egress budget.
+//
+// Foreground (user-initiated) fetches take priority: they register as pending and
+// acquire a token immediately. Background fetches first yield — they wait until no
+// foreground fetch is pending — so a live click is never stuck behind the
+// background sweep and gets the cleaner slot against the per-IP limit (ADR-026).
 func WaitFetchGate(ctx context.Context) error {
+	if isForeground(ctx) {
+		foregroundPending.Add(1)
+		defer foregroundPending.Add(-1)
+		return globalFetchGate.Wait(ctx)
+	}
+
+	// Background: defer to any pending foreground fetch before taking a token.
+	for foregroundPending.Load() > 0 {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-time.After(fgYieldPoll):
+		}
+	}
 	return globalFetchGate.Wait(ctx)
 }

internal/adapters/youtube/gate_test.go

@@ -82,3 +82,37 @@ func TestSetFetchRateZeroIsUnlimited(t *testing.T) {
 		require.NoError(t, WaitFetchGate(context.Background()))
 	}
 }
+
+func TestForegroundContextMarker(t *testing.T) {
+	require.False(t, isForeground(context.Background()), "plain context is background")
+	require.True(t, isForeground(ForegroundContext(context.Background())), "marked context is foreground")
+}
+
+// TestWaitFetchGateForegroundProceedsImmediately: a foreground fetch acquires a
+// token without yielding, even when background callers exist.
+func TestWaitFetchGateForegroundProceedsImmediately(t *testing.T) {
+	SetFetchRate(0) // unlimited limiter — isolate the yield logic from pacing
+	foregroundPending.Store(0)
+	t.Cleanup(func() { foregroundPending.Store(0) })
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+	require.NoError(t, WaitFetchGate(ForegroundContext(ctx)), "foreground proceeds immediately")
+}
+
+// TestWaitFetchGateBackgroundYieldsToForeground: while a foreground fetch is
+// pending, a background fetch yields (does not take a token) until the foreground
+// clears — proven by a background wait timing out against its own deadline, then
+// succeeding once the foreground is done.
+func TestWaitFetchGateBackgroundYieldsToForeground(t *testing.T) {
+	SetFetchRate(0)
+	foregroundPending.Store(1) // simulate a foreground fetch in flight
+	t.Cleanup(func() { foregroundPending.Store(0) })
+
+	ctx, cancel := context.WithTimeout(context.Background(), 250*time.Millisecond)
+	defer cancel()
+	require.Error(t, WaitFetchGate(ctx), "background yields (blocks) while foreground is pending")
+
+	foregroundPending.Store(0) // foreground done
+	require.NoError(t, WaitFetchGate(context.Background()), "background proceeds once foreground clears")
+}

internal/adapters/youtube/videobyid_test.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 func TestVideoByID(t *testing.T) {
@@ -21,7 +21,7 @@ func TestVideoByID(t *testing.T) {
 		if got := r.URL.Query().Get("part"); got != "snippet" {
 			t.Errorf("expected part=snippet, got %q", got)
 		}
-		_, _ = w.Write([]byte(`{"items":[{"snippet":{"title":"Never Gonna Give You Up","publishedAt":"2026-05-20T09:00:00Z"}}]}`))
+		_, _ = w.Write([]byte(`{"items":[{"snippet":{"title":"Never Gonna Give You Up","channelTitle":"Rick Astley","publishedAt":"2026-05-20T09:00:00Z"}}]}`))
 	})
 
 	v, err := a.VideoByID(context.Background(), "u1", id)
@@ -34,6 +34,9 @@ func TestVideoByID(t *testing.T) {
 	if v.ProviderVideoID != id || v.Title != "Never Gonna Give You Up" {
 		t.Errorf("unexpected video: %+v", v)
 	}
+	if v.ChannelTitle != "Rick Astley" {
+		t.Errorf("ChannelTitle = %q, want Rick Astley", v.ChannelTitle)
+	}
 	if v.Provider != domain.ProviderYouTube || v.URL != "https://www.youtube.com/watch?v="+id {
 		t.Errorf("video not wired correctly: %+v", v)
 	}

internal/adapters/youtube/youtube.go

@@ -27,8 +27,8 @@ import (
 
 	"golang.org/x/oauth2"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
 // defaultBaseURL is the YouTube Data API v3 root. Overridable via Config.BaseURL
@@ -66,6 +66,13 @@ type Config struct {
 	// poll. Zero means defaultMaxVideos.
 	MaxVideosPerSubscription int
 
+	// MinVideoSeconds drops videos shorter than this from discovery (Shorts/clips,
+	// ADR-023). NewVideos enriches candidates with a single cheap videos.list call
+	// (contentDetails.duration + snippet.liveBroadcastContent) and filters before
+	// returning, so the scarce caption-fetch budget is never spent on them. Live
+	// and upcoming broadcasts are dropped too. Zero disables the filter.
+	MinVideoSeconds int
+
 	// BaseURL overrides the Data API root. Empty means defaultBaseURL.
 	BaseURL string
 
@@ -234,6 +241,7 @@ func (a *Adapter) NewVideos(ctx context.Context, sub domain.Subscription) ([]dom
 			Provider:        domain.ProviderYouTube,
 			ProviderVideoID: vid,
 			Title:           item.Snippet.Title,
+			ChannelTitle:    sub.ChannelTitle,
 			URL:             "https://www.youtube.com/watch?v=" + vid,
 			PublishedAt:     item.Snippet.PublishedAt,
 		})
@@ -241,7 +249,101 @@ func (a *Adapter) NewVideos(ctx context.Context, sub domain.Subscription) ([]dom
 			break
 		}
 	}
-	return videos, nil
+
+	// Drop Shorts/sub-minute clips and live/upcoming broadcasts before they ever
+	// reach the rate-limited caption path (ADR-023). One cheap videos.list call
+	// (quota API, not the timedtext throttle) supplies duration + live status.
+	return a.filterLowValue(ctx, client, videos), nil
+}
+
+// filterLowValue removes videos shorter than cfg.MinVideoSeconds and any live or
+// upcoming broadcast, using a single videos.list lookup for duration +
+// liveBroadcastContent. The filter is best-effort: if MinVideoSeconds is 0 (off)
+// or the lookup fails, the input is returned unfiltered — discovery must not break
+// because a metadata call hiccuped; the worst case is the pre-ADR-023 behaviour.
+func (a *Adapter) filterLowValue(ctx context.Context, client *http.Client, videos []domain.Video) []domain.Video {
+	if a.cfg.MinVideoSeconds <= 0 || len(videos) == 0 {
+		return videos
+	}
+
+	ids := make([]string, 0, len(videos))
+	for _, v := range videos {
+		ids = append(ids, v.ProviderVideoID)
+	}
+	q := url.Values{
+		"part": {"contentDetails,snippet"},
+		"id":   {strings.Join(ids, ",")},
+	}
+	var resp videoListResponse
+	if err := a.getJSON(ctx, client, "/videos", q, &resp); err != nil {
+		// Degrade open: keep the candidates rather than lose discovery.
+		return videos
+	}
+
+	type meta struct {
+		seconds int
+		live    string
+	}
+	byID := make(map[string]meta, len(resp.Items))
+	for _, it := range resp.Items {
+		byID[it.ID] = meta{seconds: parseISO8601Seconds(it.ContentDetails.Duration), live: it.Snippet.LiveBroadcastContent}
+	}
+
+	kept := videos[:0]
+	for _, v := range videos {
+		m, ok := byID[v.ProviderVideoID]
+		if !ok {
+			kept = append(kept, v) // unknown metadata: keep, let the fetch decide
+			continue
+		}
+		if m.live != "" && m.live != "none" {
+			continue // live or upcoming broadcast
+		}
+		if m.seconds > 0 && m.seconds < a.cfg.MinVideoSeconds {
+			continue // Short / sub-threshold clip
+		}
+		// Carry the duration we already fetched onto the kept video so the store
+		// can persist it (ADR-028) — the burst's length-aware selection depends on
+		// it. Discarding it here was the gap the onboarding investigation found.
+		v.DurationSeconds = m.seconds
+		kept = append(kept, v)
+	}
+	return kept
+}
+
+// parseISO8601Seconds parses an ISO 8601 duration as returned by the YouTube Data
+// API (e.g. "PT1H2M3S", "PT45S", "PT3M") into seconds. Only the hour/minute/second
+// components YouTube emits are handled; an unparseable or zero value returns 0,
+// which the caller treats as "unknown" (not filtered on duration).
+func parseISO8601Seconds(d string) int {
+	if !strings.HasPrefix(d, "PT") {
+		return 0
+	}
+	d = d[2:]
+	total, num := 0, 0
+	seen := false
+	for _, r := range d {
+		switch {
+		case r >= '0' && r <= '9':
+			num = num*10 + int(r-'0')
+			seen = true
+		case r == 'H':
+			total += num * 3600
+			num, seen = 0, false
+		case r == 'M':
+			total += num * 60
+			num, seen = 0, false
+		case r == 'S':
+			total += num
+			num, seen = 0, false
+		default:
+			return 0 // unexpected component (days/weeks) — treat as unknown
+		}
+	}
+	if seen {
+		return 0 // trailing digits without a unit: malformed
+	}
+	return total
 }
 
 // VideoByID fetches a single video's metadata (videos.list, snippet) for an
@@ -270,6 +372,7 @@ func (a *Adapter) VideoByID(ctx context.Context, userID, videoID string) (domain
 		Provider:        domain.ProviderYouTube,
 		ProviderVideoID: videoID,
 		Title:           it.Snippet.Title,
+		ChannelTitle:    it.Snippet.ChannelTitle,
 		URL:             "https://www.youtube.com/watch?v=" + videoID,
 		PublishedAt:     it.Snippet.PublishedAt,
 	}, nil
@@ -375,10 +478,16 @@ type playlistItemListResponse struct {
 
 type videoListResponse struct {
 	Items []struct {
+		ID      string `json:"id"`
 		Snippet struct {
-			Title       string    `json:"title"`
-			PublishedAt time.Time `json:"publishedAt"`
+			Title                string    `json:"title"`
+			ChannelTitle         string    `json:"channelTitle"`
+			PublishedAt          time.Time `json:"publishedAt"`
+			LiveBroadcastContent string    `json:"liveBroadcastContent"`
 		} `json:"snippet"`
+		ContentDetails struct {
+			Duration string `json:"duration"` // ISO 8601, e.g. "PT1M30S"
+		} `json:"contentDetails"`
 	} `json:"items"`
 }
 

internal/adapters/youtube/youtube_test.go

@@ -7,7 +7,7 @@ import (
 	"net/http/httptest"
 	"testing"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // --- fakes ------------------------------------------------------------------
@@ -131,7 +131,7 @@ func TestNewVideos(t *testing.T) {
 		}`))
 	})
 
-	sub := domain.Subscription{ID: "s1", UserID: "u1", ChannelID: "UC_acme"}
+	sub := domain.Subscription{ID: "s1", UserID: "u1", ChannelID: "UC_acme", ChannelTitle: "Acme Channel"}
 	vids, err := a.NewVideos(context.Background(), sub)
 	if err != nil {
 		t.Fatalf("NewVideos: %v", err)
@@ -143,6 +143,9 @@ func TestNewVideos(t *testing.T) {
 	if v.ProviderVideoID != "vid1" || v.Title != "Designing for Attention" {
 		t.Errorf("unexpected video: %+v", v)
 	}
+	if v.ChannelTitle != "Acme Channel" {
+		t.Errorf("ChannelTitle = %q, want Acme Channel", v.ChannelTitle)
+	}
 	if v.Provider != domain.ProviderYouTube || v.URL != "https://www.youtube.com/watch?v=vid1" {
 		t.Errorf("video not wired correctly: %+v", v)
 	}
@@ -183,6 +186,96 @@ func TestNewVideosCapsAtMax(t *testing.T) {
 	}
 }
 
+// TestNewVideosFiltersShortsAndLive: with MinVideoSeconds set, discovery enriches
+// candidates via videos.list and drops sub-threshold clips (Shorts) and
+// live/upcoming broadcasts before they reach the rate-limited caption path.
+func TestNewVideosFiltersShortsAndLive(t *testing.T) {
+	a, _ := newTestAdapter(t, func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/playlistItems":
+			_, _ = w.Write([]byte(`{
+				"items": [
+					{"snippet": {"title": "Real Talk", "publishedAt": "2026-06-03T10:00:00Z", "resourceId": {"videoId": "long1"}}},
+					{"snippet": {"title": "A Short", "publishedAt": "2026-06-03T09:00:00Z", "resourceId": {"videoId": "short1"}}},
+					{"snippet": {"title": "Live Now", "publishedAt": "2026-06-03T08:00:00Z", "resourceId": {"videoId": "live1"}}}
+				]
+			}`))
+		case "/videos":
+			if got := r.URL.Query().Get("part"); got != "contentDetails,snippet" {
+				t.Errorf("videos.list part=%q, want contentDetails,snippet", got)
+			}
+			_, _ = w.Write([]byte(`{
+				"items": [
+					{"id": "long1", "contentDetails": {"duration": "PT12M30S"}, "snippet": {"liveBroadcastContent": "none"}},
+					{"id": "short1", "contentDetails": {"duration": "PT45S"}, "snippet": {"liveBroadcastContent": "none"}},
+					{"id": "live1", "contentDetails": {"duration": "PT0S"}, "snippet": {"liveBroadcastContent": "live"}}
+				]
+			}`))
+		default:
+			t.Errorf("unexpected path %q", r.URL.Path)
+		}
+	})
+	a.cfg.MinVideoSeconds = 60
+
+	vids, err := a.NewVideos(context.Background(), domain.Subscription{ID: "s1", UserID: "u1", ChannelID: "UC_acme"})
+	if err != nil {
+		t.Fatalf("NewVideos: %v", err)
+	}
+	if len(vids) != 1 || vids[0].ProviderVideoID != "long1" {
+		t.Fatalf("expected only long1 to survive the filter, got %+v", vids)
+	}
+	// The duration fetched for the filter is carried onto the kept video so the
+	// store can persist it (ADR-028) instead of discarding it.
+	if vids[0].DurationSeconds != 750 {
+		t.Fatalf("kept video DurationSeconds = %d, want 750 (PT12M30S)", vids[0].DurationSeconds)
+	}
+}
+
+// TestNewVideosNoFilterWhenDisabled: MinVideoSeconds=0 keeps the pre-ADR-023
+// behaviour — no videos.list call, no filtering.
+func TestNewVideosNoFilterWhenDisabled(t *testing.T) {
+	a, _ := newTestAdapter(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/videos" {
+			t.Errorf("videos.list must not be called when MinVideoSeconds is 0")
+		}
+		_, _ = w.Write([]byte(`{"items": [
+			{"snippet": {"title": "A Short", "publishedAt": "2026-06-03T09:00:00Z", "resourceId": {"videoId": "short1"}}}
+		]}`))
+	})
+	a.cfg.MinVideoSeconds = 0
+
+	vids, err := a.NewVideos(context.Background(), domain.Subscription{ID: "s1", UserID: "u1", ChannelID: "UC_acme"})
+	if err != nil {
+		t.Fatalf("NewVideos: %v", err)
+	}
+	if len(vids) != 1 {
+		t.Fatalf("filter disabled must keep all videos, got %d", len(vids))
+	}
+}
+
+func TestParseISO8601Seconds(t *testing.T) {
+	cases := []struct {
+		in   string
+		want int
+	}{
+		{"PT45S", 45},
+		{"PT1M30S", 90},
+		{"PT3M", 180},
+		{"PT1H2M3S", 3723},
+		{"PT2H", 7200},
+		{"PT0S", 0},
+		{"", 0},
+		{"garbage", 0},
+		{"P1D", 0},  // days component not handled → unknown
+		{"PT10", 0}, // trailing digits without a unit → malformed
+	}
+	for _, c := range cases {
+		if got := parseISO8601Seconds(c.in); got != c.want {
+			t.Errorf("parseISO8601Seconds(%q) = %d, want %d", c.in, got, c.want)
+		}
+	}
+}
+
 // TestUploadsPlaylistID covers the zero-cost UC->UU derivation, including
 // non-standard ids that must fall through unchanged (handled via fallback).
 func TestUploadsPlaylistID(t *testing.T) {

internal/auth/auth_test.go

@@ -12,7 +12,7 @@ import (
 
 	"golang.org/x/oauth2"
 
-	"gitea.d-ma.be/mathias/tapir/internal/auth"
+	"git.d-ma.be/mathias/tapir/internal/auth"
 )
 
 // fakeWriter is a TokenWriter capturing the persisted (ref, value).

internal/config/config.go

@@ -28,8 +28,41 @@ type Config struct {
 	GatewayURL string
 	// GatewayKey authorizes the gateway. Read from env, never committed.
 	GatewayKey string
-	// SummarizerModel is the alias in host/name form, e.g. "koala/phi4-mini".
+	// SummarizerModel is the primary summarizer alias in host/name form, tried
+	// first on every video, e.g. "koala/phi4-mini".
 	SummarizerModel string
+	// FallbackModel is the LOCAL fallback alias tried when the primary fails or
+	// returns unparseable output (ADR-022). Kept local so content stays on the
+	// homelab stack. Default is an IGUANA model (not koala) so the fallback runs
+	// on a different host than the koala primary — koala carries other loads, and
+	// a different host also means a different egress IP for the (rare) fallback.
+	// Empty disables it.
+	FallbackModel string
+	// CloudFallbackModel is the worst-case EXTERNAL fallback alias, tried only
+	// after every local endpoint has failed (ADR-022). For client deployments set
+	// this empty so content never leaves the local stack. Default a berget alias.
+	CloudFallbackModel string
+	// SummaryMaxTokens caps the completion budget per summary call. Small-context
+	// models (koala/phi4-mini, 8k) overflow when prompt + max_tokens exceeds the
+	// window; a summary needs only a few hundred tokens, so the default is small.
+	SummaryMaxTokens int
+	// MaxTranscriptChars bounds the transcript text sent to the model so a long
+	// transcript does not overflow a small-context primary. 0 disables truncation.
+	MaxTranscriptChars int
+
+	// MinVideoSeconds drops videos shorter than this from discovery (Shorts and
+	// other sub-minute clips that are noise and waste the scarce caption-fetch
+	// budget, ADR-014/ADR-023). Enforced via a cheap Data API videos.list lookup at
+	// discovery, never the rate-limited caption path. 0 disables the filter.
+	MinVideoSeconds int
+
+	// ChannelCaptionlessThreshold is how many consecutive no-caption results a
+	// channel may yield before its videos are suppressed from caption fetching
+	// (ADR-024). 0 disables the per-channel caption memory entirely.
+	ChannelCaptionlessThreshold int
+	// ChannelCaptionlessWindow is how long a suppressed channel stays suppressed
+	// before one video is re-probed (auto-recovery for a channel that adds captions).
+	ChannelCaptionlessWindow time.Duration
 	// SummarizerTimeout bounds a single completion call. Thinking models are
 	// slow, so the default is generous.
 	SummarizerTimeout time.Duration
@@ -87,6 +120,21 @@ type Config struct {
 	// caption rate gate (ADR-014) — the cap bounds count, never the pacing. Default 3.
 	OnboardSummarizeCount int
 
+	// OnboardSummarizerModel is the summarizer alias the connect-time burst leads
+	// its chain with (ADR-028) — a stronger model is affordable on the ≤3 summaries
+	// that form a new user's first impression. It heads a burst-specific chain;
+	// the standard chain (ADR-022) follows as resilience. Empty (or equal to
+	// SummarizerModel) collapses the burst back onto the shared processor — the
+	// reversibility lever. Default iguana/gemma4-26b (the brain-validated model).
+	OnboardSummarizerModel string
+
+	// OnboardMaxVideoSeconds upper-bounds the duration of a video the onboarding
+	// burst will pick (ADR-028), so the burst does not spend a scarce caption fetch
+	// on a multi-hour livestream VOD that passed the live filter once it ended. Only
+	// a KNOWN duration outside [MinVideoSeconds, this] is dropped; a NULL/unknown
+	// duration is kept (degrade-open). 0 disables the upper bound. Default 14400 (4h).
+	OnboardMaxVideoSeconds int
+
 	// DiscoveryInterval, when > 0, makes `serve` run in-process scheduled discovery
 	// for ALL users on that cadence (ADR-018). Zero/unset = disabled, so dev and
 	// tests never auto-fetch. Single-replica assumption — see cmdServe.
@@ -95,6 +143,11 @@ type Config struct {
 	// HTTPAddr is the listen address for `tapir serve` (the Stage-0 web UI).
 	HTTPAddr string
 
+	// MetricsAddr is the listen address for the Prometheus /metrics endpoint
+	// (ADR-030). A SEPARATE port from HTTPAddr so /metrics is never exposed on the
+	// public app — only scraped in-cluster. Empty disables the metrics server.
+	MetricsAddr string
+
 	// PublicURL is the externally-reachable base URL of the deployed service,
 	// e.g. "https://tapir.d-ma.be". Used to build absolute links handed to humans
 	// (the `tapir invite` URL). No trailing slash is assumed — callers trim it.
@@ -116,19 +169,29 @@ func (c Config) DexConfigured() bool { return strings.TrimSpace(c.OIDCIssuer) !=
 
 // Defaults (see docs/homelab-integration.md). All overridable via env.
 const (
-	defaultGatewayURL            = "http://koala:30401/v1"
-	defaultSummarizerModel       = "koala/phi4-mini"
-	defaultSummarizerTimeout     = 5 * time.Minute
-	defaultYTTokenRef            = "youtube/refresh_token"
-	defaultYTConnectRedirectURL  = "https://tapir.d-ma.be/oauth/youtube/callback"
-	defaultOAuthRedirectAddr     = "localhost:8080"
-	defaultHTTPAddr              = ":8080"
-	defaultFetchBackoff          = time.Hour
-	defaultFetchRate             = 2 * time.Second
-	defaultPublicURL             = "https://tapir.d-ma.be"
-	defaultAutoSummarizeWindow   = 7 * 24 * time.Hour
-	defaultOnboardSummarizeCount = 3
-	maxOnboardSummarizeCount     = 5
+	defaultGatewayURL             = "http://koala:30401/v1"
+	defaultSummarizerModel        = "koala/phi4-mini"
+	defaultFallbackModel          = "iguana/gemma4-26b"
+	defaultCloudFallbackModel     = "berget/mistral-small"
+	defaultSummaryMaxTokens       = 1500
+	defaultMaxTranscriptChars     = 18000
+	defaultMinVideoSeconds        = 60
+	defaultCaptionlessThreshold   = 5
+	defaultCaptionlessWindow      = 14 * 24 * time.Hour
+	defaultSummarizerTimeout      = 5 * time.Minute
+	defaultYTTokenRef             = "youtube/refresh_token"
+	defaultYTConnectRedirectURL   = "https://tapir.d-ma.be/oauth/youtube/callback"
+	defaultOAuthRedirectAddr      = "localhost:8080"
+	defaultHTTPAddr               = ":8080"
+	defaultMetricsAddr            = ":9090"
+	defaultFetchBackoff           = time.Hour
+	defaultFetchRate              = 2 * time.Second
+	defaultPublicURL              = "https://tapir.d-ma.be"
+	defaultAutoSummarizeWindow    = 7 * 24 * time.Hour
+	defaultOnboardSummarizeCount  = 3
+	maxOnboardSummarizeCount      = 5
+	defaultOnboardSummarizerModel = "iguana/gemma4-26b"
+	defaultOnboardMaxVideoSeconds = 14400 // 4h
 )
 
 // Load reads the environment into a Config, applying defaults. It does not
@@ -137,24 +200,28 @@ const (
 // it needs.
 func Load() (Config, error) {
 	c := Config{
-		UserID:               os.Getenv("TAPIR_USER_ID"),
-		GatewayURL:           envOr("TAPIR_GATEWAY_URL", defaultGatewayURL),
-		GatewayKey:           os.Getenv("TAPIR_GATEWAY_KEY"),
-		SummarizerModel:      envOr("TAPIR_SUMMARIZER_MODEL", defaultSummarizerModel),
-		DBDSN:                os.Getenv("TAPIR_DB_DSN"),
-		YTClientID:           os.Getenv("TAPIR_YT_CLIENT_ID"),
-		YTClientSecret:       os.Getenv("TAPIR_YT_CLIENT_SECRET"),
-		YTTokenRef:           envOr("TAPIR_YT_TOKEN_REF", defaultYTTokenRef),
-		YTConnectRedirectURL: envOr("TAPIR_YT_CONNECT_REDIRECT_URL", defaultYTConnectRedirectURL),
-		SecretsFile:          envOr("TAPIR_SECRETS_FILE", defaultSecretsFile()),
-		OAuthRedirectAddr:    envOr("TAPIR_OAUTH_REDIRECT_ADDR", defaultOAuthRedirectAddr),
-		HTTPAddr:             envOr("TAPIR_HTTP_ADDR", defaultHTTPAddr),
-		PublicURL:            envOr("TAPIR_PUBLIC_URL", defaultPublicURL),
-		OIDCIssuer:           os.Getenv("TAPIR_OIDC_ISSUER"),
-		DexClientID:          os.Getenv("TAPIR_DEX_CLIENT_ID"),
-		DexClientSecret:      os.Getenv("TAPIR_DEX_CLIENT_SECRET"),
-		OIDCRedirectURL:      os.Getenv("TAPIR_OIDC_REDIRECT_URL"),
-		SessionSecret:        os.Getenv("TAPIR_SESSION_SECRET"),
+		UserID:                 os.Getenv("TAPIR_USER_ID"),
+		GatewayURL:             envOr("TAPIR_GATEWAY_URL", defaultGatewayURL),
+		GatewayKey:             os.Getenv("TAPIR_GATEWAY_KEY"),
+		SummarizerModel:        envOr("TAPIR_SUMMARIZER_MODEL", defaultSummarizerModel),
+		OnboardSummarizerModel: lookupOr("TAPIR_ONBOARD_SUMMARIZER_MODEL", defaultOnboardSummarizerModel),
+		FallbackModel:          lookupOr("TAPIR_FALLBACK_MODEL", defaultFallbackModel),
+		CloudFallbackModel:     lookupOr("TAPIR_CLOUD_FALLBACK_MODEL", defaultCloudFallbackModel),
+		DBDSN:                  os.Getenv("TAPIR_DB_DSN"),
+		YTClientID:             os.Getenv("TAPIR_YT_CLIENT_ID"),
+		YTClientSecret:         os.Getenv("TAPIR_YT_CLIENT_SECRET"),
+		YTTokenRef:             envOr("TAPIR_YT_TOKEN_REF", defaultYTTokenRef),
+		YTConnectRedirectURL:   envOr("TAPIR_YT_CONNECT_REDIRECT_URL", defaultYTConnectRedirectURL),
+		SecretsFile:            envOr("TAPIR_SECRETS_FILE", defaultSecretsFile()),
+		OAuthRedirectAddr:      envOr("TAPIR_OAUTH_REDIRECT_ADDR", defaultOAuthRedirectAddr),
+		HTTPAddr:               envOr("TAPIR_HTTP_ADDR", defaultHTTPAddr),
+		MetricsAddr:            lookupOr("TAPIR_METRICS_ADDR", defaultMetricsAddr),
+		PublicURL:              envOr("TAPIR_PUBLIC_URL", defaultPublicURL),
+		OIDCIssuer:             os.Getenv("TAPIR_OIDC_ISSUER"),
+		DexClientID:            os.Getenv("TAPIR_DEX_CLIENT_ID"),
+		DexClientSecret:        os.Getenv("TAPIR_DEX_CLIENT_SECRET"),
+		OIDCRedirectURL:        os.Getenv("TAPIR_OIDC_REDIRECT_URL"),
+		SessionSecret:          os.Getenv("TAPIR_SESSION_SECRET"),
 	}
 
 	timeout, err := durationOr("TAPIR_SUMMARIZER_TIMEOUT", defaultSummarizerTimeout)
@@ -193,6 +260,45 @@ func Load() (Config, error) {
 	}
 	c.AutoSummarizeWindow = autoWindow
 
+	summaryTokens, err := intOr("TAPIR_SUMMARY_MAX_TOKENS", defaultSummaryMaxTokens)
+	if err != nil {
+		return Config{}, err
+	}
+	c.SummaryMaxTokens = summaryTokens
+
+	maxChars, err := intOr("TAPIR_MAX_TRANSCRIPT_CHARS", defaultMaxTranscriptChars)
+	if err != nil {
+		return Config{}, err
+	}
+	if maxChars < 0 {
+		maxChars = 0
+	}
+	c.MaxTranscriptChars = maxChars
+
+	minVideo, err := intOr("TAPIR_MIN_VIDEO_SECONDS", defaultMinVideoSeconds)
+	if err != nil {
+		return Config{}, err
+	}
+	if minVideo < 0 {
+		minVideo = 0
+	}
+	c.MinVideoSeconds = minVideo
+
+	captionThreshold, err := intOr("TAPIR_CHANNEL_CAPTIONLESS_THRESHOLD", defaultCaptionlessThreshold)
+	if err != nil {
+		return Config{}, err
+	}
+	if captionThreshold < 0 {
+		captionThreshold = 0
+	}
+	c.ChannelCaptionlessThreshold = captionThreshold
+
+	captionWindow, err := durationOr("TAPIR_CHANNEL_CAPTIONLESS_WINDOW", defaultCaptionlessWindow)
+	if err != nil {
+		return Config{}, err
+	}
+	c.ChannelCaptionlessWindow = captionWindow
+
 	onboard, err := intOr("TAPIR_ONBOARD_SUMMARIZE_COUNT", defaultOnboardSummarizeCount)
 	if err != nil {
 		return Config{}, err
@@ -205,6 +311,15 @@ func Load() (Config, error) {
 	}
 	c.OnboardSummarizeCount = onboard
 
+	onboardMax, err := intOr("TAPIR_ONBOARD_MAX_VIDEO_SECONDS", defaultOnboardMaxVideoSeconds)
+	if err != nil {
+		return Config{}, err
+	}
+	if onboardMax < 0 {
+		onboardMax = 0
+	}
+	c.OnboardMaxVideoSeconds = onboardMax
+
 	return c, nil
 }
 
@@ -269,6 +384,17 @@ func envOr(key, fallback string) string {
 	return fallback
 }
 
+// lookupOr returns the env value when the key is PRESENT (even if empty), else
+// fallback. Unlike envOr it lets an explicit empty value override the default —
+// needed to DISABLE an optional fallback model (e.g. set the cloud fallback empty
+// for a client deployment so content never leaves the local stack).
+func lookupOr(key, fallback string) string {
+	if v, ok := os.LookupEnv(key); ok {
+		return v
+	}
+	return fallback
+}
+
 func intOr(key string, fallback int) (int, error) {
 	v := os.Getenv(key)
 	if v == "" {

internal/config/config_test.go

@@ -1,11 +1,29 @@
 package config
 
 import (
+	"os"
 	"strings"
 	"testing"
 	"time"
 )
 
+// unset removes an env key for the duration of the test, restoring it after.
+// Needed to observe a default for a key read with LookupEnv (where present-empty
+// means "explicitly disabled", not "use default").
+func unset(t *testing.T, key string) {
+	t.Helper()
+	if old, ok := os.LookupEnv(key); ok {
+		t.Cleanup(func() {
+			if err := os.Setenv(key, old); err != nil {
+				t.Fatalf("restore %s: %v", key, err)
+			}
+		})
+	}
+	if err := os.Unsetenv(key); err != nil {
+		t.Fatalf("unset %s: %v", key, err)
+	}
+}
+
 // setEnv sets env vars for the test and clears them afterward, so cases don't
 // leak into one another. t.Setenv handles restoration.
 func setEnv(t *testing.T, kv map[string]string) {
@@ -53,6 +71,46 @@ func TestLoad_AppliesDefaults(t *testing.T) {
 	}
 }
 
+func TestLoad_SummarizerChainDefaults(t *testing.T) {
+	setEnv(t, map[string]string{
+		"TAPIR_SUMMARIZER_MODEL":     "",
+		"TAPIR_SUMMARY_MAX_TOKENS":   "",
+		"TAPIR_MAX_TRANSCRIPT_CHARS": "",
+	})
+	unset(t, "TAPIR_FALLBACK_MODEL")
+	unset(t, "TAPIR_CLOUD_FALLBACK_MODEL")
+
+	c, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.FallbackModel != defaultFallbackModel {
+		t.Errorf("FallbackModel = %q, want %q", c.FallbackModel, defaultFallbackModel)
+	}
+	if c.CloudFallbackModel != defaultCloudFallbackModel {
+		t.Errorf("CloudFallbackModel = %q, want %q", c.CloudFallbackModel, defaultCloudFallbackModel)
+	}
+	if c.SummaryMaxTokens != defaultSummaryMaxTokens {
+		t.Errorf("SummaryMaxTokens = %d, want %d", c.SummaryMaxTokens, defaultSummaryMaxTokens)
+	}
+	if c.MaxTranscriptChars != defaultMaxTranscriptChars {
+		t.Errorf("MaxTranscriptChars = %d, want %d", c.MaxTranscriptChars, defaultMaxTranscriptChars)
+	}
+}
+
+// An explicitly empty cloud-fallback env disables external routing — the lever a
+// client deployment pulls so content never leaves the local stack.
+func TestLoad_EmptyCloudFallbackDisables(t *testing.T) {
+	t.Setenv("TAPIR_CLOUD_FALLBACK_MODEL", "")
+	c, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.CloudFallbackModel != "" {
+		t.Errorf("CloudFallbackModel = %q, want empty (disabled)", c.CloudFallbackModel)
+	}
+}
+
 func TestLoad_OnboardSummarizeCount(t *testing.T) {
 	cases := []struct {
 		name, env string
@@ -156,3 +214,62 @@ func TestValidateForAuth_PassesWhenComplete(t *testing.T) {
 		t.Errorf("ValidateForAuth: unexpected error %v", err)
 	}
 }
+
+func TestLoad_OnboardSummarizerModel(t *testing.T) {
+	cases := []struct {
+		name, env string
+		set       bool
+		want      string
+	}{
+		{"default", "", false, defaultOnboardSummarizerModel},
+		{"explicit", "koala/some-model", true, "koala/some-model"},
+		{"empty disables (collapses to shared processor)", "", true, ""},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			env := map[string]string{}
+			if c.set {
+				env["TAPIR_ONBOARD_SUMMARIZER_MODEL"] = c.env
+			}
+			setEnv(t, env)
+			cfg, err := Load()
+			if err != nil {
+				t.Fatalf("Load: %v", err)
+			}
+			if cfg.OnboardSummarizerModel != c.want {
+				t.Fatalf("OnboardSummarizerModel = %q, want %q", cfg.OnboardSummarizerModel, c.want)
+			}
+		})
+	}
+}
+
+func TestLoad_OnboardMaxVideoSeconds(t *testing.T) {
+	cases := []struct {
+		name, env string
+		want      int
+	}{
+		{"default", "", defaultOnboardMaxVideoSeconds},
+		{"explicit", "7200", 7200},
+		{"zero disables", "0", 0},
+		{"negative clamps to zero", "-9", 0},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			setEnv(t, map[string]string{"TAPIR_ONBOARD_MAX_VIDEO_SECONDS": c.env})
+			cfg, err := Load()
+			if err != nil {
+				t.Fatalf("Load: %v", err)
+			}
+			if cfg.OnboardMaxVideoSeconds != c.want {
+				t.Fatalf("OnboardMaxVideoSeconds = %d, want %d", cfg.OnboardMaxVideoSeconds, c.want)
+			}
+		})
+	}
+}
+
+func TestLoad_OnboardMaxVideoSecondsInvalid(t *testing.T) {
+	setEnv(t, map[string]string{"TAPIR_ONBOARD_MAX_VIDEO_SECONDS": "long"})
+	if _, err := Load(); err == nil {
+		t.Fatal("Load: want error for non-numeric TAPIR_ONBOARD_MAX_VIDEO_SECONDS")
+	}
+}

internal/domain/domain.go

@@ -73,9 +73,15 @@ type Video struct {
 	Provider        Provider
 	ProviderVideoID string
 	Title           string
+	ChannelTitle    string
 	URL             string
 	PublishedAt     time.Time
 	SeenAt          time.Time
+	// DurationSeconds is the video length in seconds, when known (fetched by the
+	// ADR-023 videos.list enrichment at discovery). 0 means unknown — the store
+	// preserves a previously-known value rather than overwriting it with 0, and
+	// the onboarding burst (ADR-028) treats unknown as degrade-open (kept).
+	DurationSeconds int
 }
 
 // Transcript is the text of a video (or a record that none was available).

internal/metrics/metrics.go

@@ -0,0 +1,139 @@
+// Package metrics is Tapir's Prometheus instrumentation (ADR-030, issue #15). It
+// owns the collectors and a small typed API the rest of the app calls — adapters
+// never touch prometheus types directly. Two themes:
+//
+//   - HTTP/session: request count + latency by route (the matched pattern, so
+//     cardinality stays bounded), and logins.
+//   - AI (the priority): summarization latency by model/outcome/fallback, caption
+//     fetch latency by outcome, chat latency by model, and LLM token usage.
+//
+// Handler() is served on a dedicated port (never the public app port) so a scrape
+// is in-cluster only. slog timing lines are emitted at the call sites too.
+package metrics
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// latencyBuckets spans sub-second UI calls up to multi-minute model calls (a cold
+// local model load is tens of seconds; the cloud fallback can be longer).
+var latencyBuckets = []float64{0.05, 0.1, 0.25, 0.5, 1, 2, 5, 10, 20, 30, 60, 120, 300}
+
+var (
+	httpRequests = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "tapir_http_requests_total",
+		Help: "HTTP requests by method, matched route pattern, and status code.",
+	}, []string{"method", "route", "code"})
+
+	httpDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "tapir_http_request_duration_seconds",
+		Help:    "HTTP request latency by method and matched route pattern.",
+		Buckets: []float64{0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2, 5},
+	}, []string{"method", "route"})
+
+	logins = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "tapir_logins_total",
+		Help: "Successful OIDC logins (session established).",
+	})
+
+	summarizeDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "tapir_summarize_duration_seconds",
+		Help:    "Per-endpoint summarization latency by model, outcome (success|parse_error|error), and whether it was a fallback.",
+		Buckets: latencyBuckets,
+	}, []string{"model", "outcome", "fallback"})
+
+	captionFetchDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "tapir_caption_fetch_duration_seconds",
+		Help:    "Caption fetch latency by outcome (captions|none|rate_limited).",
+		Buckets: latencyBuckets,
+	}, []string{"outcome"})
+
+	chatDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "tapir_chat_duration_seconds",
+		Help:    "Per-video Q&A answer latency by model.",
+		Buckets: latencyBuckets,
+	}, []string{"model"})
+
+	llmTokens = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "tapir_llm_tokens_total",
+		Help: "LLM tokens consumed by model and kind (prompt|completion).",
+	}, []string{"model", "kind"})
+)
+
+// Handler serves the Prometheus exposition format. Mount on the dedicated metrics
+// port, never the public app mux.
+func Handler() http.Handler { return promhttp.Handler() }
+
+// IncLogin records a successful login.
+func IncLogin() { logins.Inc() }
+
+// ObserveSummarize records one summarization endpoint attempt.
+func ObserveSummarize(model, outcome string, fallback bool, d time.Duration) {
+	summarizeDuration.WithLabelValues(model, outcome, strconv.FormatBool(fallback)).Observe(d.Seconds())
+}
+
+// ObserveCaptionFetch records one caption fetch by outcome.
+func ObserveCaptionFetch(outcome string, d time.Duration) {
+	captionFetchDuration.WithLabelValues(outcome).Observe(d.Seconds())
+}
+
+// ObserveChat records one Q&A answer latency.
+func ObserveChat(model string, d time.Duration) {
+	chatDuration.WithLabelValues(model).Observe(d.Seconds())
+}
+
+// RecordTokens records LLM token usage from a completion's usage block. Zero
+// counts are skipped so a provider that omits usage adds nothing.
+func RecordTokens(model string, prompt, completion int) {
+	if prompt > 0 {
+		llmTokens.WithLabelValues(model, "prompt").Add(float64(prompt))
+	}
+	if completion > 0 {
+		llmTokens.WithLabelValues(model, "completion").Add(float64(completion))
+	}
+}
+
+// HTTPMiddleware records request count + latency. It reads r.Pattern AFTER the
+// inner handler routes (Go 1.22 sets it during ServeMux matching), so the label is
+// the bounded registered pattern (e.g. "GET /v/{videoId}"), never the raw path
+// with its high-cardinality ids. Unmatched requests bucket as "other".
+func HTTPMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		sw := &statusWriter{ResponseWriter: w, code: http.StatusOK}
+		next.ServeHTTP(sw, r)
+
+		route := r.Pattern
+		if route == "" {
+			route = "other"
+		}
+		httpRequests.WithLabelValues(r.Method, route, strconv.Itoa(sw.code)).Inc()
+		httpDuration.WithLabelValues(r.Method, route).Observe(time.Since(start).Seconds())
+	})
+}
+
+// statusWriter captures the response status for the request-count label.
+type statusWriter struct {
+	http.ResponseWriter
+	code        int
+	wroteHeader bool
+}
+
+func (s *statusWriter) WriteHeader(code int) {
+	if !s.wroteHeader {
+		s.code = code
+		s.wroteHeader = true
+	}
+	s.ResponseWriter.WriteHeader(code)
+}
+
+func (s *statusWriter) Write(b []byte) (int, error) {
+	s.wroteHeader = true // an implicit 200
+	return s.ResponseWriter.Write(b)
+}

internal/metrics/metrics_test.go

@@ -0,0 +1,92 @@
+package metrics
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	dto "github.com/prometheus/client_model/go"
+	"github.com/stretchr/testify/require"
+)
+
+// histCount reads a histogram child's observation count (testutil.ToFloat64 only
+// works on counters/gauges; a histogram's WithLabelValues child is an Observer).
+func histCount(t *testing.T, o prometheus.Observer) uint64 {
+	t.Helper()
+	m, ok := o.(prometheus.Metric)
+	require.True(t, ok, "histogram child must be a prometheus.Metric")
+	var d dto.Metric
+	require.NoError(t, m.Write(&d))
+	return d.GetHistogram().GetSampleCount()
+}
+
+// TestObserveSummarizeRecordsModelOutcomeFallback: a success observation lands on
+// the right model/outcome/fallback series.
+func TestObserveSummarizeRecordsModelOutcomeFallback(t *testing.T) {
+	before := histCount(t, summarizeDuration.WithLabelValues("koala/phi4-mini", "success", "false"))
+	ObserveSummarize("koala/phi4-mini", "success", false, 1200*time.Millisecond)
+	after := histCount(t, summarizeDuration.WithLabelValues("koala/phi4-mini", "success", "false"))
+	require.Equal(t, before+1, after, "one success observation recorded for the model")
+}
+
+// TestObserveSummarizeRecordsFailureOutcomes: error and parse_error are distinct
+// series so a fallback chain's failures are visible.
+func TestObserveSummarizeRecordsFailureOutcomes(t *testing.T) {
+	e0 := histCount(t, summarizeDuration.WithLabelValues("m", "error", "false"))
+	p0 := histCount(t, summarizeDuration.WithLabelValues("m", "parse_error", "false"))
+	ObserveSummarize("m", "error", false, time.Second)
+	ObserveSummarize("m", "parse_error", false, time.Second)
+	require.Equal(t, e0+1, histCount(t, summarizeDuration.WithLabelValues("m", "error", "false")))
+	require.Equal(t, p0+1, histCount(t, summarizeDuration.WithLabelValues("m", "parse_error", "false")))
+}
+
+func TestObserveCaptionFetchByOutcome(t *testing.T) {
+	b := histCount(t, captionFetchDuration.WithLabelValues("captions"))
+	ObserveCaptionFetch("captions", 3*time.Second)
+	require.Equal(t, b+1, histCount(t, captionFetchDuration.WithLabelValues("captions")))
+}
+
+func TestChatAnswerLatencyRecorded(t *testing.T) {
+	b := histCount(t, chatDuration.WithLabelValues("iguana/gemma4-26b"))
+	ObserveChat("iguana/gemma4-26b", 2*time.Second)
+	require.Equal(t, b+1, histCount(t, chatDuration.WithLabelValues("iguana/gemma4-26b")))
+}
+
+// TestRecordTokens: prompt + completion land on their kind series; zero is skipped.
+func TestRecordTokens(t *testing.T) {
+	p0 := testutil.ToFloat64(llmTokens.WithLabelValues("m", "prompt"))
+	c0 := testutil.ToFloat64(llmTokens.WithLabelValues("m", "completion"))
+	RecordTokens("m", 100, 40)
+	RecordTokens("m", 0, 0) // skipped, no panic
+	require.Equal(t, p0+100, testutil.ToFloat64(llmTokens.WithLabelValues("m", "prompt")))
+	require.Equal(t, c0+40, testutil.ToFloat64(llmTokens.WithLabelValues("m", "completion")))
+}
+
+func TestLoginCounted(t *testing.T) {
+	b := testutil.ToFloat64(logins)
+	IncLogin()
+	require.Equal(t, b+1, testutil.ToFloat64(logins))
+}
+
+// TestHTTPMiddlewareRecordsByRoutePattern: the request is counted under the bounded
+// registered pattern (r.Pattern after routing), not the raw path with its ids.
+func TestHTTPMiddlewareRecordsByRoutePattern(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /v/{videoId}", func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusTeapot)
+	})
+	h := HTTPMiddleware(mux)
+
+	before := testutil.ToFloat64(httpRequests.WithLabelValues("GET", "GET /v/{videoId}", "418"))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/v/abc-123", nil))
+
+	require.Equal(t, http.StatusTeapot, rec.Code)
+	after := testutil.ToFloat64(httpRequests.WithLabelValues("GET", "GET /v/{videoId}", "418"))
+	require.Equal(t, before+1, after, "counted under the pattern, not /v/abc-123")
+	require.Equal(t, float64(0), testutil.ToFloat64(httpRequests.WithLabelValues("GET", "/v/abc-123", "418")),
+		"raw path must never be a label value")
+}

internal/ports/ports.go

@@ -7,7 +7,7 @@ package ports
 import (
 	"context"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // VideoSource is a video platform Tapir watches (YouTube, Vimeo).
@@ -27,6 +27,26 @@ type Summarizer interface {
 	Summarize(ctx context.Context, v domain.Video, t domain.Transcript) (domain.Summary, error)
 }
 
+// TranscriptStore persists transcripts as shared, video-keyed public content
+// (ADR-021). It is keyed by the cross-user dedup key (provider, providerVideoID)
+// — the video's public identity, NOT Tapir's per-user videos.id — and holds only
+// public caption content, so it is deliberately NOT user-scoped: two users who
+// share a video share the one row. The engine reads it before any caption fetch
+// so re-analysis never re-touches YouTube (ADR-010/014).
+type TranscriptStore interface {
+	// GetTranscript returns the stored transcript for a video and whether one
+	// exists. A stored Source == SourceNone (captions permanently absent) is a
+	// real hit: ok is true and HasText() is false, so callers skip without
+	// re-fetching. A transient rate-limit is never stored, so it never appears
+	// here as a false absence.
+	GetTranscript(ctx context.Context, provider, providerVideoID string) (t domain.Transcript, ok bool, err error)
+	// SaveTranscript upserts the transcript for (provider, providerVideoID). Only
+	// terminal outcomes are persisted: SourceCaptions (with text) or SourceNone.
+	// SourceRateLimited must NOT be passed — it is a per-user retry (ADR-014), not
+	// a shared terminal state.
+	SaveTranscript(ctx context.Context, provider, providerVideoID string, t domain.Transcript) error
+}
+
 // Sink delivers a summary to a destination (user store, brain, ...).
 // Implementations fail independently of one another.
 type Sink interface {

internal/runner/runner.go

@@ -19,16 +19,17 @@ import (
 	"slices"
 	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
-	"gitea.d-ma.be/mathias/tapir/internal/usecase"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/usecase"
 )
 
 // passCandidate is a video that passed all pre-filters (seen/manual/backoff)
 // and is queued for transcript fetch + summarization in this pass.
 type passCandidate struct {
-	v   domain.Video
-	pos int // discovery position — used as a stable tiebreak when published_at ties
+	v         domain.Video
+	channelID string // owning channel — keys the caption-availability memory (ADR-024)
+	pos       int    // discovery position — used as a stable tiebreak when published_at ties
 }
 
 // compareNewestFirst orders candidates by published_at descending, NULLS LAST,
@@ -74,6 +75,14 @@ type VideoStore interface {
 	// Called when NewVideos returns domain.ErrChannelUnavailable; best-effort, errors
 	// are logged and never abort the pass.
 	UpsertChannelError(ctx context.Context, userID, channelID, channelTitle string) error
+	// CaptionlessChannels returns channel ids currently suppressed because their
+	// recent videos all yielded no captions (ADR-024). The loop skips caption
+	// fetches for these channels' (non-requested) videos.
+	CaptionlessChannels(ctx context.Context, userID string) (map[string]bool, error)
+	// RecordChannelCaptionOutcome updates a channel's caption memory after a fetch:
+	// hadCaptions resets it, otherwise the no-caption streak grows and the channel
+	// is suppressed for window once it reaches threshold. A no-op when threshold<=0.
+	RecordChannelCaptionOutcome(ctx context.Context, userID, channelID string, hadCaptions bool, threshold int, window time.Duration) error
 }
 
 // Processor runs the core use case for a single video. *usecase.Engine
@@ -93,6 +102,9 @@ type Runner struct {
 	backoff    time.Duration    // rate-limit retry window; 0 = always retry
 	autoWindow time.Duration    // recency bound for auto-summarize; 0 = no bound
 	now        func() time.Time // injectable clock (tests); defaults to time.Now
+
+	captionThreshold int           // consecutive no-caption results before a channel is suppressed; 0 = feature off
+	captionWindow    time.Duration // how long a caption-less channel stays suppressed before re-probe
 }
 
 // Option configures a Runner at construction. Variadic so existing call sites
@@ -114,6 +126,14 @@ func WithClock(now func() time.Time) Option { return func(r *Runner) { r.now = n
 // bypasses the bound. 0 (the default) disables it (summarize every unseen video).
 func WithAutoWindow(d time.Duration) Option { return func(r *Runner) { r.autoWindow = d } }
 
+// WithCaptionMemory enables per-channel caption-availability suppression
+// (ADR-024): after threshold consecutive no-caption results a channel's videos
+// are skipped (no caption fetch) for window, then one is re-probed. threshold<=0
+// (the default) disables the feature entirely.
+func WithCaptionMemory(threshold int, window time.Duration) Option {
+	return func(r *Runner) { r.captionThreshold = threshold; r.captionWindow = window }
+}
+
 // New builds a Runner. A nil logger falls back to slog.Default.
 func New(src ports.VideoSource, store VideoStore, engine Processor, userID string, log *slog.Logger, opts ...Option) *Runner {
 	if log == nil {
@@ -131,15 +151,16 @@ func New(src ports.VideoSource, store VideoStore, engine Processor, userID strin
 
 // Stats summarizes one RunOnce pass.
 type Stats struct {
-	Candidates         int
-	Summarized         int
-	SkippedSeen        int
-	SkippedNoText      int
-	SkippedManual      int // discovered but not queued, in manual mode
-	SkippedTooOld      int // auto mode: published outside the recency window (not requested)
-	SkippedRateLimited int // 429'd previously and still inside the backoff window
-	Errors             int
-	ChannelUnavailable int // channels that returned HTTP 404 (deleted/private)
+	Candidates              int
+	Summarized              int
+	SkippedSeen             int
+	SkippedNoText           int
+	SkippedManual           int // discovered but not queued, in manual mode
+	SkippedTooOld           int // auto mode: published outside the recency window (not requested)
+	SkippedRateLimited      int // 429'd previously and still inside the backoff window
+	SkippedNoCaptionChannel int // channel suppressed as caption-less (ADR-024)
+	Errors                  int
+	ChannelUnavailable      int // channels that returned HTTP 404 (deleted/private)
 }
 
 // tooOld reports whether a video published at publishedAt falls outside the
@@ -213,6 +234,17 @@ func (r *Runner) RunOnce(ctx context.Context) (Stats, error) {
 		}
 	}
 
+	// Per-channel caption memory (ADR-024): channels whose recent videos all
+	// yielded no captions are suppressed so their new videos don't burn the scarce
+	// fetch budget. Loaded only when the feature is enabled (threshold > 0).
+	var captionless map[string]bool
+	if r.captionThreshold > 0 {
+		captionless, err = r.store.CaptionlessChannels(ctx, r.userID)
+		if err != nil {
+			return stats, fmt.Errorf("runner: load caption-less channels: %w", err)
+		}
+	}
+
 	subs, err := r.src.ListSubscriptions(ctx, r.userID)
 	if err != nil {
 		return stats, fmt.Errorf("runner: list subscriptions: %w", err)
@@ -273,6 +305,14 @@ func (r *Runner) RunOnce(ctx context.Context) (Stats, error) {
 				continue
 			}
 
+			// Caption-less channel (ADR-024): its recent videos all returned no
+			// captions, so skip the fetch entirely. The video is still listed
+			// (UpsertVideo above); an explicit manual request bypasses the skip.
+			if !requested[id] && captionless[sub.ChannelID] {
+				stats.SkippedNoCaptionChannel++
+				continue
+			}
+
 			// Still inside the rate-limit backoff window: skip without fetching.
 			if at, ok := rateLimited[id]; ok && r.now().Sub(at) < r.backoff {
 				stats.SkippedRateLimited++
@@ -280,7 +320,7 @@ func (r *Runner) RunOnce(ctx context.Context) (Stats, error) {
 				continue
 			}
 
-			candidates = append(candidates, passCandidate{v: v, pos: pos})
+			candidates = append(candidates, passCandidate{v: v, channelID: sub.ChannelID, pos: pos})
 			pos++
 		}
 	}
@@ -320,6 +360,11 @@ func (r *Runner) RunOnce(ctx context.Context) (Stats, error) {
 				errs = append(errs, fmt.Errorf("set none status %q: %w", c.v.ProviderVideoID, err))
 				stats.Errors++
 			}
+			// No captions: grow this channel's no-caption streak (ADR-024).
+			if err := r.store.RecordChannelCaptionOutcome(ctx, r.userID, c.channelID, false, r.captionThreshold, r.captionWindow); err != nil {
+				errs = append(errs, fmt.Errorf("record no-caption %q: %w", c.v.ProviderVideoID, err))
+				stats.Errors++
+			}
 			r.log.Info("skipped video (no transcript)", "video", c.v.ProviderVideoID, "title", c.v.Title)
 		case res.Summary != nil:
 			stats.Summarized++
@@ -327,6 +372,11 @@ func (r *Runner) RunOnce(ctx context.Context) (Stats, error) {
 				errs = append(errs, fmt.Errorf("set fetched status %q: %w", c.v.ProviderVideoID, err))
 				stats.Errors++
 			}
+			// Captions present: reset this channel's caption memory (ADR-024).
+			if err := r.store.RecordChannelCaptionOutcome(ctx, r.userID, c.channelID, true, r.captionThreshold, r.captionWindow); err != nil {
+				errs = append(errs, fmt.Errorf("record has-caption %q: %w", c.v.ProviderVideoID, err))
+				stats.Errors++
+			}
 			// In manual mode the video was explicitly queued; clear the flag so
 			// it is not re-summarized and the UI drops the "Queued" chip.
 			if !auto {
@@ -354,6 +404,7 @@ func (r *Runner) Loop(ctx context.Context, interval time.Duration) error {
 			"skipped_seen", stats.SkippedSeen, "skipped_no_text", stats.SkippedNoText,
 			"skipped_manual", stats.SkippedManual, "skipped_too_old", stats.SkippedTooOld,
 			"skipped_rate_limited", stats.SkippedRateLimited,
+			"skipped_no_caption_channel", stats.SkippedNoCaptionChannel,
 			"channel_unavailable", stats.ChannelUnavailable, "errors", stats.Errors)
 		if err != nil {
 			r.log.Warn("run pass had errors", "err", err)

internal/runner/runner_test.go

@@ -9,9 +9,9 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/runner"
-	"gitea.d-ma.be/mathias/tapir/internal/usecase"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/runner"
+	"git.d-ma.be/mathias/tapir/internal/usecase"
 )
 
 const testUser = "11111111-1111-1111-1111-111111111111"
@@ -51,6 +51,13 @@ type fakeStore struct {
 	cleared     []string
 	rateLimited map[string]time.Time // id -> when 429'd (seeds the backoff window)
 	statuses    map[string]string    // id -> last SetTranscriptStatus value
+	captionless map[string]bool      // channel ids currently suppressed (ADR-024)
+	captionRecs []captionRec         // RecordChannelCaptionOutcome calls, in order
+}
+
+type captionRec struct {
+	channelID string
+	had       bool
 }
 
 func (f *fakeStore) UpsertVideo(_ context.Context, v domain.Video) (string, error) {
@@ -93,6 +100,22 @@ func (f *fakeStore) RateLimitedVideoIDs(_ context.Context, _ string) (map[string
 
 func (f *fakeStore) UpsertChannelError(_ context.Context, _, _, _ string) error { return nil }
 
+func (f *fakeStore) CaptionlessChannels(_ context.Context, _ string) (map[string]bool, error) {
+	cp := make(map[string]bool, len(f.captionless))
+	for k, v := range f.captionless {
+		cp[k] = v
+	}
+	return cp, nil
+}
+
+func (f *fakeStore) RecordChannelCaptionOutcome(_ context.Context, _, channelID string, hadCaptions bool, threshold int, _ time.Duration) error {
+	if threshold <= 0 {
+		return nil
+	}
+	f.captionRecs = append(f.captionRecs, captionRec{channelID: channelID, had: hadCaptions})
+	return nil
+}
+
 func (f *fakeStore) SetTranscriptStatus(_ context.Context, _, videoID, status string) error {
 	if f.statuses == nil {
 		f.statuses = map[string]string{}
@@ -284,6 +307,55 @@ func TestRunOnce_AutoMode_OldVideoRequestedBypassesWindow(t *testing.T) {
 	require.Len(t, sink.delivered, 1)
 }
 
+// TestRunOnce_CaptionlessChannelSkipped: a channel flagged caption-less (ADR-024)
+// has its videos skipped from fetching but still discovered/listed, while a
+// normal channel's video is summarized.
+func TestRunOnce_CaptionlessChannelSkipped(t *testing.T) {
+	src := &fakeSource{
+		subs: []domain.Subscription{sub("dead", "Dead Channel"), sub("live", "Live Channel")},
+		videos: map[string][]domain.Video{
+			"dead": {vid("d1", "Dead One")},
+			"live": {vid("l1", "Live One")},
+		},
+	}
+	st := &fakeStore{seen: map[string]bool{}, auto: true, captionless: map[string]bool{"dead": true}}
+	sink := &recordingSink{}
+	eng := usecase.NewEngine(src, fakeSummarizer{}, sink)
+	r := runner.New(src, st, eng, testUser, quietLogger(),
+		runner.WithCaptionMemory(5, 14*24*time.Hour))
+
+	stats, err := r.RunOnce(context.Background())
+	require.NoError(t, err)
+	require.Equal(t, 1, stats.SkippedNoCaptionChannel, "dead channel's video skipped from fetch")
+	require.Equal(t, 1, stats.Summarized, "live channel's video still summarized")
+	require.Len(t, st.upserted, 2, "both videos are still discovered and listed")
+}
+
+// TestRunOnce_RecordsCaptionOutcomes: a no-caption result grows the channel's
+// streak (had=false); a successful summary resets it (had=true).
+func TestRunOnce_RecordsCaptionOutcomes(t *testing.T) {
+	src := &fakeSource{
+		subs: []domain.Subscription{sub("c1", "Has Caps"), sub("c2", "No Caps")},
+		videos: map[string][]domain.Video{
+			"c1": {vid("good", "Good")},
+			"c2": {vid("bad", "Bad")},
+		},
+		transcripts: map[string]domain.Transcript{
+			"bad": {Source: domain.SourceNone}, // no usable text → engine skips
+		},
+	}
+	st := &fakeStore{seen: map[string]bool{}, auto: true}
+	sink := &recordingSink{}
+	eng := usecase.NewEngine(src, fakeSummarizer{}, sink)
+	r := runner.New(src, st, eng, testUser, quietLogger(),
+		runner.WithCaptionMemory(5, 14*24*time.Hour))
+
+	_, err := r.RunOnce(context.Background())
+	require.NoError(t, err)
+	require.Contains(t, st.captionRecs, captionRec{channelID: "c1", had: true}, "captioned channel reset")
+	require.Contains(t, st.captionRecs, captionRec{channelID: "c2", had: false}, "no-caption channel streak grown")
+}
+
 // TestRunOnce_AutoWindowZero_SummarizesOld: a zero window disables the bound —
 // the pre-recency behaviour (summarize every unseen video) is preserved.
 func TestRunOnce_AutoWindowZero_SummarizesOld(t *testing.T) {

internal/usecase/engine.go

@@ -14,8 +14,8 @@ import (
 	"fmt"
 	"sync"
 
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/ports"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/ports"
 )
 
 // ErrNotImplemented marks scaffold methods awaiting implementation.
@@ -27,6 +27,13 @@ type Engine struct {
 	AI     ports.Summarizer
 	Sinks  []ports.Sink
 
+	// Transcripts, when set, is the shared transcript cache (ADR-021): the engine
+	// reads it before any caption fetch and writes resolved transcripts back, so
+	// re-analysis — the same user re-summarizing, or a second user with the same
+	// video — never re-touches YouTube (ADR-010/014). Optional: nil disables
+	// persistence (fetch every time), keeping the pure-core/scaffold wiring valid.
+	Transcripts ports.TranscriptStore
+
 	// processed dedups videos within this engine's lifetime so a video is not
 	// summarized twice when the watcher sees it again. Durable cross-restart
 	// dedup is the store's concern (a resolved TRANSCRIPT / existing SUMMARY,
@@ -57,9 +64,9 @@ type ProcessResult struct {
 // resolve transcript -> (summarize -> deliver) | skip.
 // See docs/use-cases/summarize_new_video.feature.
 func (e *Engine) ProcessNewVideo(ctx context.Context, v domain.Video) (ProcessResult, error) {
-	t, err := e.Source.FetchTranscript(ctx, v)
+	t, err := e.resolveTranscript(ctx, v)
 	if err != nil {
-		return ProcessResult{Video: v}, fmt.Errorf("fetch transcript: %w", err)
+		return ProcessResult{Video: v}, err
 	}
 	if !t.HasText() {
 		// No usable transcript: record the skip, produce no summary, deliver nothing
@@ -86,6 +93,39 @@ func (e *Engine) ProcessNewVideo(ctx context.Context, v domain.Video) (ProcessRe
 	return ProcessResult{Video: v, Summary: &sum, TranscriptSource: string(t.Source)}, errors.Join(errs...)
 }
 
+// resolveTranscript returns v's transcript, reading the shared store first
+// (ADR-021): a stored transcript — including a stored SourceNone (captions
+// permanently absent) — is returned without touching YouTube, so re-analysis
+// never re-fetches. On a store miss it fetches through the source (which gates
+// the caption call, ADR-014) and persists the terminal outcome so the next
+// analysis, for any user, reads from the store. A transient SourceRateLimited is
+// returned to the caller (the runner stamps a per-user backoff) but never stored,
+// so persistence can never mask a 429 as a permanent "no transcript". When no
+// TranscriptStore is wired the engine simply fetches every time.
+func (e *Engine) resolveTranscript(ctx context.Context, v domain.Video) (domain.Transcript, error) {
+	if e.Transcripts != nil {
+		stored, ok, err := e.Transcripts.GetTranscript(ctx, string(v.Provider), v.ProviderVideoID)
+		if err != nil {
+			return domain.Transcript{}, fmt.Errorf("get stored transcript: %w", err)
+		}
+		if ok {
+			return stored, nil
+		}
+	}
+
+	t, err := e.Source.FetchTranscript(ctx, v)
+	if err != nil {
+		return domain.Transcript{}, fmt.Errorf("fetch transcript: %w", err)
+	}
+
+	if e.Transcripts != nil && t.Source != domain.SourceRateLimited {
+		if err := e.Transcripts.SaveTranscript(ctx, string(v.Provider), v.ProviderVideoID, t); err != nil {
+			return domain.Transcript{}, fmt.Errorf("save transcript: %w", err)
+		}
+	}
+	return t, nil
+}
+
 // ProcessNewVideos walks a user's subscriptions and processes each newly seen
 // video. Only videos surfaced via the user's subscriptions are considered, so a
 // channel the user is not subscribed to is never processed. A video already

internal/usecase/engine_transcript_test.go

@@ -0,0 +1,187 @@
+package usecase
+
+import (
+	"context"
+	"testing"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
+)
+
+// These tests pin the ADR-021 read-stored-first behaviour at the engine core:
+// a stored transcript is summarized without re-touching the source, a miss
+// fetches once and persists, and a transient rate-limit is never cached.
+
+type recordingSource struct {
+	transcript domain.Transcript
+	fetchCalls int
+}
+
+func (s *recordingSource) ListSubscriptions(context.Context, string) ([]domain.Subscription, error) {
+	return nil, nil
+}
+
+func (s *recordingSource) NewVideos(context.Context, domain.Subscription) ([]domain.Video, error) {
+	return nil, nil
+}
+
+func (s *recordingSource) FetchTranscript(context.Context, domain.Video) (domain.Transcript, error) {
+	s.fetchCalls++
+	return s.transcript, nil
+}
+
+type fakeTranscriptStore struct {
+	stored map[string]domain.Transcript
+	saves  int
+}
+
+func newFakeTranscriptStore() *fakeTranscriptStore {
+	return &fakeTranscriptStore{stored: make(map[string]domain.Transcript)}
+}
+
+func (f *fakeTranscriptStore) key(provider, id string) string { return provider + "|" + id }
+
+func (f *fakeTranscriptStore) GetTranscript(_ context.Context, provider, id string) (domain.Transcript, bool, error) {
+	t, ok := f.stored[f.key(provider, id)]
+	return t, ok, nil
+}
+
+func (f *fakeTranscriptStore) SaveTranscript(_ context.Context, provider, id string, t domain.Transcript) error {
+	f.saves++
+	f.stored[f.key(provider, id)] = t
+	return nil
+}
+
+type countingSummarizer struct{ calls int }
+
+func (c *countingSummarizer) Summarize(_ context.Context, v domain.Video, _ domain.Transcript) (domain.Summary, error) {
+	c.calls++
+	return domain.Summary{VideoID: v.ID, UserID: v.UserID, Summary: "s", AIProvider: "local"}, nil
+}
+
+type nopSink struct{}
+
+func (nopSink) Name() string                                  { return "nop" }
+func (nopSink) Deliver(context.Context, domain.Summary) error { return nil }
+
+func testVideo() domain.Video {
+	return domain.Video{ID: "v1", UserID: "u1", Provider: domain.ProviderYouTube, ProviderVideoID: "yt1"}
+}
+
+func TestProcessNewVideo_StoredTranscriptSkipsFetch(t *testing.T) {
+	src := &recordingSource{}
+	ts := newFakeTranscriptStore()
+	ts.stored[ts.key("youtube", "yt1")] = domain.Transcript{Source: domain.SourceCaptions, Content: "stored words"}
+	sum := &countingSummarizer{}
+	eng := NewEngine(src, sum, nopSink{})
+	eng.Transcripts = ts
+
+	res, err := eng.ProcessNewVideo(context.Background(), testVideo())
+	if err != nil {
+		t.Fatalf("ProcessNewVideo: %v", err)
+	}
+	if src.fetchCalls != 0 {
+		t.Fatalf("stored transcript must not re-fetch from source; got %d fetches", src.fetchCalls)
+	}
+	if ts.saves != 0 {
+		t.Fatalf("a store hit must not re-save; got %d saves", ts.saves)
+	}
+	if sum.calls != 1 || res.Summary == nil {
+		t.Fatalf("expected a summary from the stored transcript; calls=%d summary=%v", sum.calls, res.Summary)
+	}
+}
+
+func TestProcessNewVideo_StoreMissFetchesAndPersists(t *testing.T) {
+	src := &recordingSource{transcript: domain.Transcript{Source: domain.SourceCaptions, Language: "en", Content: "fetched words"}}
+	ts := newFakeTranscriptStore()
+	sum := &countingSummarizer{}
+	eng := NewEngine(src, sum, nopSink{})
+	eng.Transcripts = ts
+
+	if _, err := eng.ProcessNewVideo(context.Background(), testVideo()); err != nil {
+		t.Fatalf("ProcessNewVideo: %v", err)
+	}
+	if src.fetchCalls != 1 {
+		t.Fatalf("a store miss must fetch exactly once; got %d", src.fetchCalls)
+	}
+	if ts.saves != 1 {
+		t.Fatalf("a fetched transcript must be persisted; got %d saves", ts.saves)
+	}
+	got, ok, _ := ts.GetTranscript(context.Background(), "youtube", "yt1")
+	if !ok || got.Content != "fetched words" {
+		t.Fatalf("persisted transcript not readable back: ok=%v content=%q", ok, got.Content)
+	}
+}
+
+// The second summarize of the same video reads the persisted transcript and does
+// NOT re-fetch — the primary ADR-021 win, proven end to end at the engine.
+func TestProcessNewVideo_SecondSummarizeDoesNotRefetch(t *testing.T) {
+	src := &recordingSource{transcript: domain.Transcript{Source: domain.SourceCaptions, Content: "words"}}
+	ts := newFakeTranscriptStore()
+	eng := NewEngine(src, &countingSummarizer{}, nopSink{})
+	eng.Transcripts = ts
+
+	for i := 0; i < 2; i++ {
+		if _, err := eng.ProcessNewVideo(context.Background(), testVideo()); err != nil {
+			t.Fatalf("pass %d: %v", i, err)
+		}
+	}
+	if src.fetchCalls != 1 {
+		t.Fatalf("the second summarize must reuse the stored transcript; got %d fetches", src.fetchCalls)
+	}
+}
+
+// A stored "no captions" outcome short-circuits before both fetch and summarize.
+func TestProcessNewVideo_StoredNoneSkipsFetchAndSummarize(t *testing.T) {
+	src := &recordingSource{}
+	ts := newFakeTranscriptStore()
+	ts.stored[ts.key("youtube", "yt1")] = domain.Transcript{Source: domain.SourceNone}
+	sum := &countingSummarizer{}
+	eng := NewEngine(src, sum, nopSink{})
+	eng.Transcripts = ts
+
+	res, err := eng.ProcessNewVideo(context.Background(), testVideo())
+	if err != nil {
+		t.Fatalf("ProcessNewVideo: %v", err)
+	}
+	if !res.Skipped {
+		t.Fatal("a stored SourceNone must skip")
+	}
+	if src.fetchCalls != 0 || sum.calls != 0 {
+		t.Fatalf("stored none must neither fetch nor summarize; fetches=%d calls=%d", src.fetchCalls, sum.calls)
+	}
+}
+
+// A transient 429 is surfaced (so the runner backs off per-user) but never cached
+// as a shared terminal state — otherwise it would mask a rate-limit as permanent.
+func TestProcessNewVideo_RateLimitedIsNotPersisted(t *testing.T) {
+	src := &recordingSource{transcript: domain.Transcript{Source: domain.SourceRateLimited}}
+	ts := newFakeTranscriptStore()
+	eng := NewEngine(src, &countingSummarizer{}, nopSink{})
+	eng.Transcripts = ts
+
+	res, err := eng.ProcessNewVideo(context.Background(), testVideo())
+	if err != nil {
+		t.Fatalf("ProcessNewVideo: %v", err)
+	}
+	if !res.Skipped || res.TranscriptSource != string(domain.SourceRateLimited) {
+		t.Fatalf("expected a rate-limited skip; skipped=%v source=%q", res.Skipped, res.TranscriptSource)
+	}
+	if ts.saves != 0 {
+		t.Fatalf("a transient rate-limit must not be persisted; got %d saves", ts.saves)
+	}
+}
+
+// With no TranscriptStore wired the engine fetches every time (back-compat).
+func TestProcessNewVideo_NilStoreFetchesEveryTime(t *testing.T) {
+	src := &recordingSource{transcript: domain.Transcript{Source: domain.SourceCaptions, Content: "words"}}
+	eng := NewEngine(src, &countingSummarizer{}, nopSink{})
+
+	for i := 0; i < 2; i++ {
+		if _, err := eng.ProcessNewVideo(context.Background(), testVideo()); err != nil {
+			t.Fatalf("pass %d: %v", i, err)
+		}
+	}
+	if src.fetchCalls != 2 {
+		t.Fatalf("nil store must fetch every time; got %d", src.fetchCalls)
+	}
+}

internal/web/account.go

@@ -3,7 +3,7 @@ package web
 import (
 	"net/http"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
 )
 
 // handleAccount renders the account page: the user's display name, the

internal/web/account_test.go

@@ -9,8 +9,8 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // fakeSecrets is a SecretRemover that records the refs it was asked to delete, so

internal/web/chat.go

@@ -0,0 +1,227 @@
+package web
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"strings"
+
+	"git.d-ma.be/mathias/tapir/internal/adapters/chat"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+)
+
+// Chatter is the per-video chat backend (ADR-027). *chat.Service satisfies it;
+// tests substitute a fake. It carries NO caption-fetch dependency — the chat
+// handlers reach it only after reading an already-stored transcript, so an
+// enabled chat cannot trigger a fetch, touch the rate gate, or reach YouTube.
+type Chatter interface {
+	// Models returns the offerable models, local-first (cloud absent when disabled).
+	Models() []string
+	// DefaultModel resolves the model a fresh chat opens with given the summary's
+	// model (the ADR-027 default), falling back to the first offered model.
+	DefaultModel(summaryModel string) string
+	// Answer runs one chat turn against the supplied stored transcript text.
+	Answer(ctx context.Context, req chat.Request) (chat.Reply, error)
+}
+
+// maxHistoryTurns bounds the ephemeral conversation carried per request, so a long
+// back-and-forth cannot grow the prompt without limit (the transcript already
+// dominates the budget). Older turns drop off the front.
+const maxHistoryTurns = 8
+
+// chatView is everything the chat templates render: the video identity for links
+// and titles, the model switcher state, the running (ephemeral) conversation, and
+// the honest flags — Available is false when no usable transcript is stored
+// (ADR-027: honest "not available", never a fetch), Truncated when the transcript
+// was bounded to fit the model, Error for a transient model failure.
+type chatView struct {
+	VideoID   string
+	Title     string
+	Available bool
+	Models    []string
+	Selected  string
+	History   []chat.Turn
+	Truncated bool
+	Error     string
+}
+
+// handleChat renders the chat page for a summarized video (GET). Entry is scoped
+// through GetSummaryByVideo, which is RLS/user-scoped: a video that is not the
+// requesting user's own resolves to ErrNotFound → 404, so chat is reachable only
+// from the user's own summary view (ADR-027 isolation). The transcript is read
+// from the SHARED store (ADR-021) — a pure DB read, never a caption fetch; an
+// absent/text-less transcript renders the honest "not available" state, no fetch.
+func (a *App) handleChat(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	row, ok := a.loadOwnedSummary(w, r, userID)
+	if !ok {
+		return
+	}
+	_, hasText, ok := a.readTranscript(w, r, *row)
+	if !ok {
+		return
+	}
+	view := chatView{
+		VideoID:   row.VideoID,
+		Title:     displayTitle(*row),
+		Available: hasText,
+		Models:    a.Chat.Models(),
+		Selected:  a.Chat.DefaultModel(row.AIModel),
+	}
+	// HTMX (the in-place reveal from the summary) gets just the open chat section,
+	// swapped over the closed dock so the summary above it stays put. A no-JS
+	// navigation gets the full page: the whole summary plus the open chat.
+	if isHTMX(r) {
+		a.render(w, r, chatSection(view))
+		return
+	}
+	a.render(w, r, ChatPage(*row, view))
+}
+
+// handleChatMessage answers one question against the stored transcript (POST).
+// It reads the transcript from the store (no fetch), runs the chosen model over
+// it plus the prior turns, appends the answer, and returns the refreshed chat
+// panel (HTMX) or the whole page (no-JS). A model failure is surfaced inline,
+// not as a 500 — the conversation and the question are preserved for a retry.
+func (a *App) handleChatMessage(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	row, ok := a.loadOwnedSummary(w, r, userID)
+	if !ok {
+		return
+	}
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "bad form", http.StatusBadRequest)
+		return
+	}
+	transcript, hasText, ok := a.readTranscript(w, r, *row)
+	if !ok {
+		return
+	}
+
+	model := a.resolveModel(r.FormValue("model"), row.AIModel)
+	history := parseHistory(r.Form["hq"], r.Form["ha"])
+	question := strings.TrimSpace(r.FormValue("question"))
+
+	view := chatView{
+		VideoID:   row.VideoID,
+		Title:     displayTitle(*row),
+		Available: hasText,
+		Models:    a.Chat.Models(),
+		Selected:  model,
+		History:   history,
+	}
+
+	switch {
+	case !hasText:
+		// Honest "not available" — no fetch, no model call (ADR-027).
+	case question == "":
+		// A model switch with no text just re-renders — no wasted round-trip.
+	default:
+		reply, err := a.Chat.Answer(r.Context(), chat.Request{
+			Model:      model,
+			Transcript: transcript,
+			History:    history,
+			Question:   question,
+		})
+		if err != nil {
+			a.logger().Error("chat answer", "video", row.VideoID, "model", model, "err", err)
+			view.Error = "That model couldn't answer just now. Try again, or switch models."
+		} else {
+			view.History = appendTurn(history, chat.Turn{Question: question, Answer: reply.Answer})
+			view.Truncated = reply.Truncated
+		}
+	}
+	a.renderChatTurn(w, r, *row, view)
+}
+
+// loadOwnedSummary fetches the summary for the path's video scoped to userID, or
+// writes the right response (404 on not-found/not-owned, 500 on error) and reports
+// false. It is the single isolation gate for both chat handlers.
+func (a *App) loadOwnedSummary(w http.ResponseWriter, r *http.Request, userID string) (*store.SummaryRow, bool) {
+	videoID := r.PathValue("videoId")
+	row, err := a.Store.GetSummaryByVideo(r.Context(), userID, videoID)
+	if errors.Is(err, store.ErrNotFound) {
+		http.NotFound(w, r)
+		return nil, false
+	}
+	if err != nil {
+		a.serverError(w, r, "chat get summary", err)
+		return nil, false
+	}
+	return row, true
+}
+
+// readTranscript reads the shared stored transcript for a row (ADR-021) and
+// reports whether it carries usable text. It is a pure DB read — NO caption fetch,
+// the property the whole feature's safety rests on. ok is false only on a store
+// error (after a 500 is written); a missing/text-less transcript is (",", false,
+// true) — the honest "not available" case, handled by the caller, not an error.
+func (a *App) readTranscript(w http.ResponseWriter, r *http.Request, row store.SummaryRow) (content string, hasText, ok bool) {
+	t, found, err := a.Store.GetTranscript(r.Context(), row.Channel, row.ProviderVideoID)
+	if err != nil {
+		a.serverError(w, r, "chat get transcript", err)
+		return "", false, false
+	}
+	if !found || !t.HasText() {
+		return "", false, true
+	}
+	return t.Content, true, true
+}
+
+// renderChatTurn returns the chat panel fragment for an HTMX answer (swapped in
+// place within the open dock), or the full chat page otherwise — the no-JS POST
+// re-renders the whole summary + open chat with the new turn.
+func (a *App) renderChatTurn(w http.ResponseWriter, r *http.Request, row store.SummaryRow, v chatView) {
+	if isHTMX(r) {
+		a.render(w, r, chatPanel(v))
+		return
+	}
+	a.render(w, r, ChatPage(row, v))
+}
+
+// resolveModel keeps the posted model only when it is an offered option; anything
+// else (a forged value, or a model dropped because cloud is disabled) falls back
+// to the default. The chat.Service enforces the same guard before the gateway;
+// this keeps the rendered switcher honest too.
+func (a *App) resolveModel(posted, summaryModel string) string {
+	for _, m := range a.Chat.Models() {
+		if m == posted {
+			return posted
+		}
+	}
+	return a.Chat.DefaultModel(summaryModel)
+}
+
+// parseHistory zips the parallel hidden hq/ha fields back into ordered turns,
+// keeping only the most recent maxHistoryTurns. net/url preserves the submission
+// order of repeated fields, so the pairing is stable.
+func parseHistory(qs, as []string) []chat.Turn {
+	n := len(qs)
+	if len(as) < n {
+		n = len(as)
+	}
+	turns := make([]chat.Turn, 0, n)
+	for i := 0; i < n; i++ {
+		turns = append(turns, chat.Turn{Question: qs[i], Answer: as[i]})
+	}
+	return capHistory(turns)
+}
+
+// appendTurn adds a completed exchange and re-bounds the conversation.
+func appendTurn(history []chat.Turn, t chat.Turn) []chat.Turn {
+	return capHistory(append(history, t))
+}
+
+// capHistory keeps the last maxHistoryTurns turns (drops the oldest).
+func capHistory(turns []chat.Turn) []chat.Turn {
+	if len(turns) <= maxHistoryTurns {
+		return turns
+	}
+	return turns[len(turns)-maxHistoryTurns:]
+}

internal/web/chat_handler_test.go

@@ -0,0 +1,375 @@
+package web_test
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/adapters/chat"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/web"
+)
+
+// videoZ is a video id used by the isolation test for a DIFFERENT user's video.
+const videoZ = "33333333-3333-3333-3333-333333333333"
+
+// --- chat test doubles -----------------------------------------------------
+
+// fakeChatter is a web.Chatter that records the request it received and returns a
+// canned reply. It performs NO network and NO fetch — it stands in for the real
+// chat.Service so the handler behaviour is what's under test.
+type fakeChatter struct {
+	models    []string
+	reply     chat.Reply
+	err       error
+	gotReq    chat.Request
+	callCount int
+}
+
+func (f *fakeChatter) Models() []string { return f.models }
+
+func (f *fakeChatter) DefaultModel(summaryModel string) string {
+	for _, m := range f.models {
+		if m == summaryModel {
+			return summaryModel
+		}
+	}
+	if len(f.models) > 0 {
+		return f.models[0]
+	}
+	return ""
+}
+
+func (f *fakeChatter) Answer(_ context.Context, req chat.Request) (chat.Reply, error) {
+	f.callCount++
+	f.gotReq = req
+	if f.err != nil {
+		return chat.Reply{}, f.err
+	}
+	return f.reply, nil
+}
+
+// tripwireProcessor and tripwireFetcher are the YouTube-reaching collaborators
+// (summarize → caption fetch, and the paste metadata fetch). Wired into the App
+// for the safety test, they fail it the instant chat routes into either — the
+// behavioural proof that chat never triggers a fetch (ADR-027).
+type tripwireProcessor struct{ t *testing.T }
+
+func (p tripwireProcessor) ProcessVideo(context.Context, string, string) error {
+	p.t.Fatal("chat triggered summarization (→ caption fetch) — must never happen (ADR-027)")
+	return nil
+}
+
+type tripwireFetcher struct{ t *testing.T }
+
+func (f tripwireFetcher) FetchVideo(context.Context, string, string) (domain.Video, error) {
+	f.t.Fatal("chat triggered a YouTube video fetch — must never happen (ADR-027)")
+	return domain.Video{}, nil
+}
+
+// --- helpers ---------------------------------------------------------------
+
+// newChatApp builds the App under test as the registered stub user, with a Chat
+// backend wired. Mirrors newApp but adds chat (and any extra wiring via mutate).
+func newChatApp(t *testing.T, chatter web.Chatter, mutate func(*web.App)) *web.App {
+	t.Helper()
+	s := newStore(t)
+	app := &web.App{
+		Store:    s,
+		Identity: s,
+		Auth:     web.StubAuth{U: web.User{Subject: stubSubject}},
+		Chat:     chatter,
+	}
+	if mutate != nil {
+		mutate(app)
+	}
+	return app
+}
+
+// seededProviderVideoID mirrors seedVideo's derivation so the chat path's
+// (provider, providerVideoID) transcript key matches the seeded video row.
+func seededProviderVideoID(videoID string) string { return "pv-" + videoID[:8] }
+
+// seedTranscript stores a shared (provider, providerVideoID) transcript — the
+// ADR-021 stored content the chat reads. Captions source = usable text.
+func seedTranscript(t *testing.T, s *store.Store, videoID, content string) {
+	t.Helper()
+	err := s.SaveTranscript(context.Background(), "youtube", seededProviderVideoID(videoID),
+		domain.Transcript{Source: domain.SourceCaptions, Language: "en", Content: content})
+	require.NoError(t, err)
+}
+
+func getChat(t *testing.T, app *web.App, videoID string) *httptest.ResponseRecorder {
+	t.Helper()
+	return do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoID+"/chat", nil))
+}
+
+func postChat(t *testing.T, app *web.App, videoID string, form url.Values, htmx bool) *httptest.ResponseRecorder {
+	t.Helper()
+	req := httptest.NewRequest(http.MethodPost, "/v/"+videoID+"/chat", strings.NewReader(form.Encode()))
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	if htmx {
+		req.Header.Set("HX-Request", "true")
+	}
+	return do(t, app, req)
+}
+
+// --- scenarios -------------------------------------------------------------
+
+// The "dig deeper" affordance appears on a summary detail view only when chat is
+// enabled, and links to that video's chat — the single entry point (ADR-027 §1).
+func TestChatEntryAffordanceOnSummaryView(t *testing.T) {
+	ctx := context.Background()
+	withChat := newChatApp(t, &fakeChatter{models: []string{"phi4-mini"}}, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, withChat, videoX, "body x"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	html := body(t, do(t, withChat, httptest.NewRequest(http.MethodGet, "/v/"+videoX, nil)))
+	require.Contains(t, html, "Dig deeper", "the deeper-dive affordance is shown when chat is enabled")
+	require.Contains(t, html, "/v/"+videoX+"/chat", "it links to this video's chat")
+	require.Contains(t, html, `id="chat-section"`, "the dock lives on the detail page")
+	require.Contains(t, html, `hx-get="/v/`+videoX+`/chat"`, "it opens the chat in place (HTMX), not a navigation")
+
+	// With no chat backend wired the affordance is absent (routes unmounted).
+	noChat := newApp(t)
+	require.NoError(t, deliver(ctx, noChat, videoX, "body x"))
+	html = body(t, do(t, noChat, httptest.NewRequest(http.MethodGet, "/v/"+videoX, nil)))
+	require.NotContains(t, html, "Dig deeper", "no affordance when chat is disabled")
+}
+
+// The summary and the chat live together (the integrated UX): the no-JS chat page
+// renders the full summary alongside the chat, and the HTMX reveal returns just
+// the open chat section as a fragment so it docks in below the summary already on
+// screen — the summary is never navigated away from.
+func TestChatIntegratedWithSummaryOnSamePage(t *testing.T) {
+	ctx := context.Background()
+	chatter := &fakeChatter{models: []string{"phi4-mini", "gemma4-26b"}}
+	app := newChatApp(t, chatter, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "SUMMARY-BODY-MARKER"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	seedTranscript(t, app.Store.(*store.Store), videoX, "the transcript")
+
+	// No-JS full page: the summary payload and the chat are on one page.
+	html := body(t, getChat(t, app, videoX))
+	require.Contains(t, html, "SUMMARY-BODY-MARKER", "the summary text is shown on the chat page")
+	require.Contains(t, html, "takeaway one", "takeaways shown alongside the chat")
+	require.Contains(t, html, "highlight one", "highlights shown alongside the chat")
+	require.Contains(t, html, "Ask about this video", "the chat sits on the same page as the summary")
+	require.Contains(t, html, `name="question"`, "the ask form is present")
+
+	// HTMX reveal: the open chat section ONLY (a fragment) — no full-page chrome and
+	// no duplicated summary, so it swaps in below the summary already rendered.
+	req := httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/chat", nil)
+	req.Header.Set("HX-Request", "true")
+	frag := body(t, do(t, app, req))
+	require.NotContains(t, frag, "<html", "the reveal is a fragment, not a full page")
+	require.NotContains(t, frag, "SUMMARY-BODY-MARKER", "the reveal does not re-send the summary (it's already on screen)")
+	require.Contains(t, frag, `id="chat-section"`, "the fragment replaces the dock in place")
+	require.Contains(t, frag, `name="question"`, "the ask form is in the revealed section")
+}
+
+// THE KEY SAFETY ASSERTION (ADR-027): a chat answer is produced entirely from the
+// stored transcript — the model receives the stored text, and neither the
+// summarize→fetch path nor the YouTube fetch path is ever touched. The tripwire
+// collaborators t.Fatal the test if chat reaches them.
+func TestChatAnswersFromStoredTranscriptWithoutAnyFetch(t *testing.T) {
+	ctx := context.Background()
+	const transcript = "STORED-TRANSCRIPT-MARKER: the host explains attention budgets."
+	chatter := &fakeChatter{
+		models: []string{"phi4-mini"},
+		reply:  chat.Reply{Answer: "It is about attention budgets."},
+	}
+	app := newChatApp(t, chatter, func(a *web.App) {
+		a.Processor = tripwireProcessor{t} // fails the test if chat summarizes/fetches
+		a.Fetcher = tripwireFetcher{t}     // fails the test if chat fetches video metadata
+	})
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary body"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	seedTranscript(t, app.Store.(*store.Store), videoX, transcript)
+
+	form := url.Values{"question": {"what is it about?"}, "model": {"phi4-mini"}}
+	rec := postChat(t, app, videoX, form, true)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+	require.Contains(t, body(t, rec), "It is about attention budgets.", "the answer is rendered")
+	require.Equal(t, 1, chatter.callCount, "the model was asked exactly once")
+	require.Equal(t, transcript, chatter.gotReq.Transcript,
+		"the model answered from the STORED transcript, not a fetched one")
+	// The tripwires never firing IS the no-fetch / no-YouTube proof.
+}
+
+// A video with no stored transcript yields an honest "not available" — and never
+// a fetch, never a model call (ADR-027 §2: do not add an on-demand-fetch path).
+func TestChatUnavailableWhenNoStoredTranscript(t *testing.T) {
+	ctx := context.Background()
+	chatter := &fakeChatter{models: []string{"phi4-mini"}}
+	app := newChatApp(t, chatter, func(a *web.App) {
+		a.Processor = tripwireProcessor{t}
+		a.Fetcher = tripwireFetcher{t}
+	})
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary body"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	// NB: no seedTranscript — the transcript is absent.
+
+	rec := getChat(t, app, videoX)
+	require.Equal(t, http.StatusOK, rec.Code)
+	require.Contains(t, body(t, rec), "isn't available", "honest not-available copy")
+
+	// Asking anyway still triggers nothing: no model call, no fetch.
+	rec = postChat(t, app, videoX, url.Values{"question": {"hi"}, "model": {"phi4-mini"}}, true)
+	require.Equal(t, http.StatusOK, rec.Code)
+	require.Equal(t, 0, chatter.callCount, "no model call without a stored transcript")
+}
+
+// Chat is reachable ONLY from the user's own summary view: opening chat for a
+// video that belongs to another user 404s (the summary read is RLS-scoped), so a
+// guessed/arbitrary video id is not a chat surface (ADR-027 §5 isolation).
+func TestChatOnlyReachableForOwnVideo(t *testing.T) {
+	chatter := &fakeChatter{models: []string{"phi4-mini"}}
+	app := newChatApp(t, chatter, func(a *web.App) {
+		a.Processor = tripwireProcessor{t}
+		a.Fetcher = tripwireFetcher{t}
+	})
+	p := rawPool(t)
+	resetDB(t, p)
+
+	// A summarized video with a stored transcript owned by ANOTHER user.
+	const other = "22222222-2222-2222-2222-222222222222"
+	seedForeignSummaryWithTranscript(t, p, other, videoZ, "Foreign Title")
+
+	rec := getChat(t, app, videoZ)
+	require.Equal(t, http.StatusNotFound, rec.Code, "cannot open chat for another user's video")
+	require.Equal(t, 0, chatter.callCount, "no model call for a non-owned video")
+
+	rec = postChat(t, app, videoZ, url.Values{"question": {"hi"}, "model": {"phi4-mini"}}, true)
+	require.Equal(t, http.StatusNotFound, rec.Code, "cannot post chat to another user's video")
+}
+
+// The switcher offers exactly the backend's models, defaults to the summary's own
+// model, and a switch re-runs against the SAME transcript with the chosen model
+// (ADR-027 §3 — model-comparison instrumentation). A model dropped from the offer
+// set (e.g. cloud disabled) is not rendered.
+func TestChatModelSwitcherDefaultAndSwitch(t *testing.T) {
+	ctx := context.Background()
+	// The seeded summary's model is "phi4-mini" (see handlers_test summary()).
+	chatter := &fakeChatter{
+		models: []string{"phi4-mini", "gemma4-26b"}, // note: no cloud model offered
+		reply:  chat.Reply{Answer: "answer"},
+	}
+	app := newChatApp(t, chatter, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary body"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	seedTranscript(t, app.Store.(*store.Store), videoX, "the transcript text")
+
+	html := body(t, getChat(t, app, videoX))
+	require.Contains(t, html, "gemma4-26b", "every offered model is in the switcher")
+	require.NotContains(t, html, "mistral", "a non-offered (cloud-disabled) model is absent")
+	require.Contains(t, html, `value="phi4-mini" selected`, "defaults to the summary's own model")
+
+	// Switching to gemma re-runs against the same stored transcript.
+	form := url.Values{"question": {"q"}, "model": {"gemma4-26b"}}
+	rec := postChat(t, app, videoX, form, true)
+	require.Equal(t, http.StatusOK, rec.Code)
+	require.Equal(t, "gemma4-26b", chatter.gotReq.Model, "the chosen model answers")
+	require.Equal(t, "the transcript text", chatter.gotReq.Transcript, "against the same transcript")
+}
+
+// A truncated transcript surfaces the honest bounded-context note (ADR-027 §2).
+func TestChatTruncationNoteShown(t *testing.T) {
+	ctx := context.Background()
+	chatter := &fakeChatter{
+		models: []string{"phi4-mini"},
+		reply:  chat.Reply{Answer: "answer", Truncated: true},
+	}
+	app := newChatApp(t, chatter, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary body"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	seedTranscript(t, app.Store.(*store.Store), videoX, "long transcript")
+
+	rec := postChat(t, app, videoX, url.Values{"question": {"q"}, "model": {"phi4-mini"}}, true)
+	require.Contains(t, body(t, rec), "bounded portion", "the truncation note is shown")
+}
+
+// A multi-turn conversation is carried in the request (hidden fields), not the DB:
+// prior turns ride back into the next answer, and nothing is persisted (ADR-027 §4).
+func TestChatMultiTurnHistoryIsEphemeral(t *testing.T) {
+	ctx := context.Background()
+	chatter := &fakeChatter{models: []string{"phi4-mini"}, reply: chat.Reply{Answer: "second answer"}}
+	app := newChatApp(t, chatter, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary body"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	seedTranscript(t, app.Store.(*store.Store), videoX, "the transcript")
+
+	// Second turn posts the prior exchange as hidden history fields.
+	form := url.Values{
+		"question": {"follow-up question"},
+		"model":    {"phi4-mini"},
+		"hq":       {"first question"},
+		"ha":       {"first answer"},
+	}
+	rec := postChat(t, app, videoX, form, true)
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	require.Len(t, chatter.gotReq.History, 1, "the prior turn was carried into the request")
+	require.Equal(t, "first question", chatter.gotReq.History[0].Question)
+	require.Equal(t, "first answer", chatter.gotReq.History[0].Answer)
+
+	html := body(t, rec)
+	require.Contains(t, html, "second answer", "the new answer renders")
+	require.Contains(t, html, "first question", "the conversation persists in page state")
+
+	// Nothing was written to the DB — there is no chat table; the summaries/actions
+	// are unchanged by a chat turn.
+	row, err := app.Store.GetSummaryByVideo(ctx, userID, videoX)
+	require.NoError(t, err)
+	require.Equal(t, "summary body", row.Summary, "chat never mutates stored data")
+}
+
+// --- foreign-user seeding (isolation) --------------------------------------
+
+// seedForeignSummaryWithTranscript creates a fully-summarized, transcript-backed
+// video owned by a DIFFERENT user via the raw pool (which bypasses RLS), so the
+// isolation test can confirm the requesting user cannot open chat for it.
+func seedForeignSummaryWithTranscript(t *testing.T, p *pgxpool.Pool, otherUserID, videoID, title string) {
+	t.Helper()
+	ctx := context.Background()
+	_, err := p.Exec(ctx, `INSERT INTO users (id) VALUES ($1) ON CONFLICT (id) DO NOTHING`, otherUserID)
+	require.NoError(t, err)
+	_, err = p.Exec(ctx,
+		`INSERT INTO videos (id, user_id, provider, provider_video_id, title, url)
+		 VALUES ($1, $2, 'youtube', $3, $4, 'https://z')`,
+		videoID, otherUserID, seededProviderVideoID(videoID), title)
+	require.NoError(t, err)
+	_, err = p.Exec(ctx,
+		`INSERT INTO summaries (user_id, video_id, summary, ai_provider, ai_model)
+		 VALUES ($1, $2, 'foreign summary', 'local', 'phi4-mini')`,
+		otherUserID, videoID)
+	require.NoError(t, err)
+	_, err = p.Exec(ctx,
+		`INSERT INTO transcripts (provider, provider_video_id, source, language, content)
+		 VALUES ('youtube', $1, 'captions', 'en', 'foreign transcript')`,
+		seededProviderVideoID(videoID))
+	require.NoError(t, err)
+}

internal/web/connect.go

@@ -12,8 +12,8 @@ import (
 	"sync"
 	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/auth"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/auth"
 )
 
 // Connections is the narrow write port the connect flow depends on (Clean

internal/web/connect_test.go

@@ -11,9 +11,9 @@ import (
 	"github.com/stretchr/testify/require"
 	"golang.org/x/oauth2"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/auth"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/auth"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // fakeWriter is a TokenWriter capturing the persisted (ref, value).

internal/web/handlers.go

@@ -11,8 +11,8 @@ import (
 
 	"github.com/a-h/templ"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // Store is the read/write surface the web handlers depend on — a narrow port over
@@ -21,8 +21,15 @@ import (
 // fake without a database.
 type Store interface {
 	ListVideos(ctx context.Context, userID string, limit int) ([]store.SummaryRow, error)
+	// DistinctChannels lists the user's source channels — the options for the
+	// feed's channel multi-select filter.
+	DistinctChannels(ctx context.Context, userID string) ([]string, error)
 	GetSummaryByVideo(ctx context.Context, userID, videoID string) (*store.SummaryRow, error)
 	GetVideoRow(ctx context.Context, userID, videoID string) (*store.SummaryRow, error)
+	// GetTranscript reads the shared, stored transcript keyed by (provider,
+	// providerVideoID) — ADR-021. It is a pure DB read: it never fetches captions,
+	// so the chat path (ADR-027) reaches it without any caption-fetch surface.
+	GetTranscript(ctx context.Context, provider, providerVideoID string) (domain.Transcript, bool, error)
 	ActionsFor(ctx context.Context, userID string, videoIDs []string) (map[string][]string, error)
 	SetAction(ctx context.Context, userID, videoID, action string) error
 	ClearAction(ctx context.Context, userID, videoID, action string) error
@@ -88,6 +95,11 @@ type App struct {
 	// Fetcher, when non-nil, resolves an arbitrary YouTube video id to metadata for
 	// the paste-a-URL flow (Feature 2). Nil = the /paste route is not mounted.
 	Fetcher VideoFetcher
+	// Chat, when non-nil, answers per-video questions against a video's STORED
+	// transcript (ADR-027). Nil = the /v/{id}/chat routes are not mounted and the
+	// summary view shows no "dig deeper" affordance. It holds no caption-fetch
+	// dependency, so an enabled chat cannot reach YouTube or the rate gate.
+	Chat Chatter
 	// Processing tracks in-flight immediate summarizations so the status endpoint
 	// shows the animation until the summary lands. The zero value is ready to use.
 	Processing ProcessingSet
@@ -139,6 +151,8 @@ func (a *App) Router() http.Handler {
 	app := http.NewServeMux()
 	app.HandleFunc("GET /{$}", a.handleList)
 	app.HandleFunc("GET /v/{videoId}", a.handleDetail)
+	app.HandleFunc("GET /v/{videoId}/expand", a.handleExpand)
+	app.HandleFunc("GET /v/{videoId}/card", a.handleCard)
 	app.HandleFunc("POST /v/{videoId}/action", a.handleAction)
 	app.HandleFunc("POST /v/{videoId}/summarize", a.handleRequestSummarize)
 	app.HandleFunc("POST /v/{videoId}/retry-now", a.handleRetryNow)
@@ -146,6 +160,12 @@ func (a *App) Router() http.Handler {
 		app.HandleFunc("POST /paste", a.handlePaste)
 	}
 	app.HandleFunc("GET /v/{videoId}/status", a.handleStatus)
+	// Per-video deeper-dive chat over the STORED transcript (ADR-027). Mounted only
+	// when a Chat backend is wired; it never fetches captions.
+	if a.Chat != nil {
+		app.HandleFunc("GET /v/{videoId}/chat", a.handleChat)
+		app.HandleFunc("POST /v/{videoId}/chat", a.handleChatMessage)
+	}
 	app.HandleFunc("GET /register", a.handleRegisterForm)
 	app.HandleFunc("POST /register", a.handleRegister)
 
@@ -196,7 +216,7 @@ func (a *App) handleList(w http.ResponseWriter, r *http.Request) {
 	}
 	q := r.URL.Query()
 	f := Filter{
-		Channel:        q.Get("channel"),
+		Channels:       nonEmptyStrings(q["channel"]),
 		From:           q.Get("from"),
 		To:             q.Get("to"),
 		OnlySummarized: q.Get("summarized") == "1",
@@ -211,6 +231,13 @@ func (a *App) handleList(w http.ResponseWriter, r *http.Request) {
 	rows := f.apply(allRows)
 	buckets := bucketRows(rows, a.recencyCutoff())
 
+	// Channel options for the multi-select filter (the user's source channels).
+	channels, err := a.Store.DistinctChannels(r.Context(), userID)
+	if err != nil {
+		a.serverError(w, r, "distinct channels", err)
+		return
+	}
+
 	// hasConnected drives both the paste box (shown to ANY connected user, #2) and
 	// the empty-state copy (a fresh account with a connection but no discovery pass
 	// yet reads "connected, summaries land gradually" rather than "nothing here").
@@ -223,11 +250,20 @@ func (a *App) handleList(w http.ResponseWriter, r *http.Request) {
 	}
 	hasConnected := len(conns) > 0
 
-	if isHTMX(r) {
-		a.render(w, r, summaryList(buckets, hasConnected))
+	// Summarization mode drives the backlog copy: an auto user is told summaries
+	// land gradually; a manual user is told to click Summarize (the first pilot
+	// user sat in manual mode reading "land automatically" and waited forever).
+	autoSummarize, err := a.Store.GetAutoSummarize(r.Context(), userID)
+	if err != nil {
+		a.serverError(w, r, "summarize mode", err)
 		return
 	}
-	a.render(w, r, ListPage(buckets, f, stats, takeFlash(w, r), hasConnected))
+
+	if isHTMX(r) {
+		a.render(w, r, summaryList(buckets, hasConnected, autoSummarize))
+		return
+	}
+	a.render(w, r, ListPage(buckets, f, stats, takeFlash(w, r), hasConnected, channels, autoSummarize))
 }
 
 // handleDetail renders one summary in full (highlights, takeaways, action group).
@@ -246,7 +282,49 @@ func (a *App) handleDetail(w http.ResponseWriter, r *http.Request) {
 		a.serverError(w, r, "get summary", err)
 		return
 	}
-	a.render(w, r, DetailPage(*row))
+	a.render(w, r, DetailPage(*row, a.Chat != nil))
+}
+
+// handleExpand returns the inline-expanded card fragment — the full summary +
+// chat dock swapped into the list card in place (ADR-031). Only summarized videos
+// have a summary to expand; a non-summarized id is a 404 (the compact card never
+// offers expand for it).
+func (a *App) handleExpand(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	videoID := r.PathValue("videoId")
+	row, err := a.Store.GetSummaryByVideo(r.Context(), userID, videoID)
+	if errors.Is(err, store.ErrNotFound) {
+		http.NotFound(w, r)
+		return
+	}
+	if err != nil {
+		a.serverError(w, r, "get summary", err)
+		return
+	}
+	a.render(w, r, expandedCard(*row, a.Chat != nil))
+}
+
+// handleCard returns the compact card fragment — the collapse target that returns
+// an expanded card to its compact form in the list (ADR-031).
+func (a *App) handleCard(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	videoID := r.PathValue("videoId")
+	row, err := a.Store.GetVideoRow(r.Context(), userID, videoID)
+	if errors.Is(err, store.ErrNotFound) {
+		http.NotFound(w, r)
+		return
+	}
+	if err != nil {
+		a.serverError(w, r, "get video", err)
+		return
+	}
+	a.render(w, r, VideoCard(*row))
 }
 
 // handleAction toggles one action: re-clicking an active verb clears it, else it
@@ -476,11 +554,22 @@ func (a *App) handleStatus(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if row.Summarized || !a.Processing.Has(processingKey(userID, videoID)) {
+	// Honest, state-aware status (ADR-025). Order matters: a finished summary wins;
+	// an in-flight goroutine shows the working spinner; a recorded rate-limit shows
+	// the calm "waiting, will retry" card that keeps polling; a recorded "none" is
+	// terminal; anything else falls back to the normal card.
+	switch {
+	case row.Summarized:
+		a.render(w, r, VideoCard(*row))
+	case a.Processing.Has(processingKey(userID, videoID)):
+		a.render(w, r, processingCard(*row))
+	case row.TranscriptStatus == "rate_limited":
+		a.render(w, r, waitingCard(*row))
+	case row.TranscriptStatus == "none":
+		a.render(w, r, noCaptionsCard(*row))
+	default:
 		a.render(w, r, VideoCard(*row))
-		return
 	}
-	a.render(w, r, processingCard(*row))
 }
 
 // handleSummarizeMode toggles the user's auto/manual summarization mode. The form

internal/web/handlers_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 	"time"
@@ -15,9 +16,9 @@ import (
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/adapters/store"
-	"gitea.d-ma.be/mathias/tapir/internal/domain"
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/adapters/store"
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // dsn points at the in-process Postgres started in TestMain. Handler tests run
@@ -26,10 +27,22 @@ import (
 var dsn string
 
 func TestMain(m *testing.M) {
-	const port = 54330 // distinct from the store package's embedded PG (54329)
+	// Per-process port + dirs so concurrent `go test` runs (e.g. a push-run and a
+	// tag-run in CI) never collide on a fixed port or shared data dir. Base 55000
+	// keeps web's range distinct from the store package (54000). Shared CachePath
+	// downloads the PG archive once.
+	port := uint32(55000 + os.Getpid()%1000)
 	dsn = fmt.Sprintf("postgres://postgres:postgres@localhost:%d/postgres?sslmode=disable", port)
 
-	pg := embeddedpostgres.NewDatabase(embeddedpostgres.DefaultConfig().Port(port))
+	rt := filepath.Join(os.TempDir(), fmt.Sprintf("tapir-epg-web-%d", os.Getpid()))
+	pg := embeddedpostgres.NewDatabase(
+		embeddedpostgres.DefaultConfig().
+			Port(port).
+			RuntimePath(rt).
+			DataPath(filepath.Join(rt, "data")).
+			BinariesPath(filepath.Join(rt, "bin")).
+			CachePath(filepath.Join(os.TempDir(), "tapir-epg-cache")),
+	)
 	if err := pg.Start(); err != nil {
 		fmt.Fprintf(os.Stderr, "embedded-postgres start: %v\n", err)
 		os.Exit(1)
@@ -38,6 +51,7 @@ func TestMain(m *testing.M) {
 	if err := pg.Stop(); err != nil {
 		fmt.Fprintf(os.Stderr, "embedded-postgres stop: %v\n", err)
 	}
+	_ = os.RemoveAll(rt)
 	os.Exit(code)
 }
 
@@ -207,13 +221,15 @@ func TestListChannelFilter(t *testing.T) {
 	resetDB(t, p)
 	require.NoError(t, deliver(ctx, app, videoX, "body x"))
 	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	_, err := p.Exec(ctx, `UPDATE videos SET channel_title = 'Acme Channel' WHERE id = $1`, videoX)
+	require.NoError(t, err)
 
-	// Channel is "youtube" for seeded rows; a non-matching filter hides them.
-	rec := do(t, app, httptest.NewRequest(http.MethodGet, "/?channel=vimeo", nil))
+	// Selecting a different channel hides the row; selecting its channel shows it.
+	rec := do(t, app, httptest.NewRequest(http.MethodGet, "/?channel=Other+Channel", nil))
 	require.Equal(t, http.StatusOK, rec.Code)
 	require.NotContains(t, body(t, rec), "X Title")
 
-	rec = do(t, app, httptest.NewRequest(http.MethodGet, "/?channel=youtube", nil))
+	rec = do(t, app, httptest.NewRequest(http.MethodGet, "/?channel=Acme+Channel", nil))
 	require.Contains(t, body(t, rec), "X Title")
 }
 
@@ -475,3 +491,45 @@ func postAction(t *testing.T, app *web.App, videoID, action string, htmx bool) *
 	}
 	return do(t, app, req)
 }
+
+// TestListManualModeBannerCopy: a manual-mode user with un-summarized videos
+// sees the manual prompt (click Summarize), NOT the "summaries land
+// automatically" copy that misled the first pilot user into waiting forever.
+func TestListManualModeBannerCopy(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{}) // pending, un-summarized
+	require.NoError(t, app.Store.SetAutoSummarize(ctx, userID, false))
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/", nil)))
+	require.Contains(t, html, "Manual mode")
+	require.Contains(t, html, "are not summarized automatically")
+	require.NotContains(t, html, "land gradually",
+		"manual-mode user must not be told summaries arrive automatically")
+}
+
+// TestListAutoModeBannerCopy: an auto-mode user with a backlog sees the
+// gradual-delivery copy, not the manual prompt.
+func TestListAutoModeBannerCopy(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+	require.NoError(t, app.Store.SetAutoSummarize(ctx, userID, true))
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/", nil)))
+	require.Contains(t, html, "land gradually")
+	require.NotContains(t, html, "are not summarized automatically")
+}
+
+// TestMetricsNotOnPublicMux: the public app router exposes no /metrics route —
+// Prometheus is served on the dedicated metrics port only (ADR-030, security R6).
+func TestMetricsNotOnPublicMux(t *testing.T) {
+	app := newApp(t)
+	resetDB(t, rawPool(t))
+	rec := do(t, app, httptest.NewRequest(http.MethodGet, "/metrics", nil))
+	require.Equal(t, http.StatusNotFound, rec.Code, "/metrics must not be on the public mux")
+}

internal/web/inline_expand_test.go

@@ -0,0 +1,107 @@
+package web_test
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestExpandReturnsSummaryBodyFragment: GET /v/{id}/expand returns the full
+// summary as an in-place card fragment (not a full page) — ADR-031.
+func TestExpandReturnsSummaryBodyFragment(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "the full summary text"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/expand", nil)))
+	require.Contains(t, html, "the full summary text")
+	require.Contains(t, html, "Takeaways")
+	require.Contains(t, html, "highlight one")
+	require.Contains(t, html, "card-expanded", "rendered as the expanded card")
+	require.Contains(t, html, "/v/"+videoX+"/card", "carries a collapse affordance")
+	require.NotContains(t, html, "<html", "fragment, not a full page")
+}
+
+// TestCollapseReturnsCompactCard: GET /v/{id}/card returns the compact card with
+// the expand affordance — the collapse target.
+func TestCollapseReturnsCompactCard(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary text"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/card", nil)))
+	require.Contains(t, html, `class="card"`, "compact card")
+	require.Contains(t, html, "/v/"+videoX+"/expand", "compact card offers expand")
+	require.NotContains(t, html, "card-expanded")
+	require.NotContains(t, html, "<html", "fragment, not a full page")
+}
+
+// TestExpandedCardOffersChatDock: with chat enabled, the expanded card includes
+// the deeper-dive chat affordance.
+func TestExpandedCardOffersChatDock(t *testing.T) {
+	ctx := context.Background()
+	app := newChatApp(t, &fakeChatter{models: []string{"m"}}, nil)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary text"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/expand", nil)))
+	require.Contains(t, html, "/v/"+videoX+"/chat", "expanded card wires the chat dock")
+}
+
+// TestCompactCardExpandOnlyWhenSummarized: a not-yet-summarized card shows its
+// summarize footer and no expand affordance.
+func TestCompactCardExpandOnlyWhenSummarized(t *testing.T) {
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	seedVideo(t, p, videoX, "Pending Title", "https://x", time.Time{}) // no summary
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/card", nil)))
+	require.Contains(t, html, "Not summarized")
+	require.NotContains(t, html, "/v/"+videoX+"/expand", "pending card offers no expand")
+}
+
+// TestCompactCardHasNoJSDetailFallback: the expand affordance carries an href to
+// the detail page, so JS-off users still reach the full summary.
+func TestCompactCardHasNoJSDetailFallback(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "summary text"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	html := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/card", nil)))
+	require.Contains(t, html, `href="/v/`+videoX+`"`, "no-JS fallback to the detail page")
+	require.Contains(t, html, "/v/"+videoX+"/expand", "and the HTMX expand for JS users")
+}
+
+// TestDetailAndExpandShareSummaryBody: the detail page and the expanded card render
+// the same summary body (one shared fragment, no drift).
+func TestDetailAndExpandShareSummaryBody(t *testing.T) {
+	ctx := context.Background()
+	app := newApp(t)
+	p := rawPool(t)
+	resetDB(t, p)
+	require.NoError(t, deliver(ctx, app, videoX, "shared summary text"))
+	seedVideo(t, p, videoX, "X Title", "https://x", time.Time{})
+
+	detail := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX, nil)))
+	expand := body(t, do(t, app, httptest.NewRequest(http.MethodGet, "/v/"+videoX+"/expand", nil)))
+	for _, want := range []string{"shared summary text", "Takeaways", "highlight one"} {
+		require.Contains(t, detail, want)
+		require.Contains(t, expand, want)
+	}
+}

internal/web/oidc/oidc.go

@@ -7,10 +7,11 @@
 // Authentication is real (Dex OIDC) and is the only gate: any Dex-authenticated
 // subject may sign in (ADR-012 dropped ADR-011's single-subject allowlist).
 // Authorization/registration is layered on top in internal/web (an authenticated
-// subject with no tapir user is routed to registration). Sessions are server-side
-// (in-memory, fine for the single Stage-1 replica) addressed by an HMAC-signed
-// (HS256) HttpOnly Secure SameSite=Lax cookie with a short TTL and sliding
-// refresh. Tokens are never logged.
+// subject with no tapir user is routed to registration). Sessions are STATELESS
+// (ADR-029): the identity + expiry live inside an HMAC-signed (HS256) HttpOnly
+// Secure SameSite=Lax persistent cookie with a long sliding TTL — no server-side
+// table, so a deploy/restart never logs anyone out and the cookie also survives
+// browser-close. Tokens are never logged; logout clears the cookie client-side.
 //
 // This is mcp-chassis's cousin but NOT the same code: mcp-chassis validates
 // inbound Bearer JWTs for MCP APIs; this is a browser session login.
@@ -26,7 +27,8 @@ import (
 	"github.com/coreos/go-oidc/v3/oidc"
 	"golang.org/x/oauth2"
 
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/metrics"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // Config is the OIDC + session configuration. cmd/tapir maps these from
@@ -47,7 +49,11 @@ type Config struct {
 }
 
 const (
-	defaultSessionTTL = time.Hour
+	// defaultSessionTTL is generous and sliding: Tapir is a "check back tomorrow"
+	// reader, so a short TTL meant a re-login (full IdP redirect dance) on almost
+	// every visit. 30 days, slid forward on each request, keeps a regular user
+	// logged in indefinitely while an abandoned session still lapses.
+	defaultSessionTTL = 30 * 24 * time.Hour
 	pendingTTL        = 10 * time.Minute
 	sessionCookie     = "tapir_session"
 	loginPath         = "/auth/login"
@@ -59,7 +65,6 @@ type DexAuth struct {
 	oauth    *oauth2.Config
 	verifier *oidc.IDTokenVerifier
 
-	sessions   *sessionStore
 	pending    *pendingStore
 	secret     []byte
 	sessionTTL time.Duration
@@ -127,7 +132,6 @@ func New(ctx context.Context, cfg Config, opts ...Option) (*DexAuth, error) {
 			RedirectURL:  cfg.RedirectURL,
 			Scopes:       []string{oidc.ScopeOpenID, "profile", "email"},
 		},
-		sessions:   newSessionStore(),
 		pending:    newPendingStore(),
 		secret:     []byte(cfg.SessionSecret),
 		sessionTTL: defaultSessionTTL,
@@ -159,31 +163,31 @@ func (d *DexAuth) Middleware(h http.Handler) http.Handler {
 			h.ServeHTTP(w, r)
 			return
 		}
-		sid, ok := d.sessionID(r)
+		c, err := r.Cookie(sessionCookie)
+		if err != nil {
+			d.redirectUnauthenticated(w, r)
+			return
+		}
+		user, _, ok := d.decodeSession(c.Value, d.now())
 		if !ok {
 			d.redirectUnauthenticated(w, r)
 			return
 		}
-		if _, ok := d.sessions.get(sid, d.now()); !ok {
-			d.redirectUnauthenticated(w, r)
-			return
-		}
-		d.sessions.refresh(sid, d.now().Add(d.sessionTTL)) // sliding refresh
+		// Sliding refresh: re-issue the cookie with a fresh expiry so an active
+		// user never lapses (the expiry lives in the cookie, so sliding = re-sign).
+		d.setSessionCookie(w, d.encodeSession(user, d.now().Add(d.sessionTTL)))
 		h.ServeHTTP(w, r)
 	})
 }
 
-// CurrentUser resolves the authenticated principal from the session cookie.
+// CurrentUser resolves the authenticated principal from the stateless cookie.
 func (d *DexAuth) CurrentUser(r *http.Request) (web.User, bool) {
-	sid, ok := d.sessionID(r)
-	if !ok {
+	c, err := r.Cookie(sessionCookie)
+	if err != nil {
 		return web.User{}, false
 	}
-	data, ok := d.sessions.get(sid, d.now())
-	if !ok {
-		return web.User{}, false
-	}
-	return data.user, true
+	user, _, ok := d.decodeSession(c.Value, d.now())
+	return user, ok
 }
 
 func (d *DexAuth) handleLogin(w http.ResponseWriter, r *http.Request) {
@@ -248,23 +252,16 @@ func (d *DexAuth) handleCallback(w http.ResponseWriter, r *http.Request) {
 	}
 	_ = idToken.Claims(&claims) // email is best-effort; subject is the identity
 
-	sid, err := randToken()
-	if err != nil {
-		http.Error(w, "internal error", http.StatusInternalServerError)
-		return
-	}
-	d.sessions.put(sid, sessionData{
-		user:   web.User{Subject: idToken.Subject, Email: claims.Email},
-		expiry: d.now().Add(d.sessionTTL),
-	})
-	d.setSessionCookie(w, sid)
+	user := web.User{Subject: idToken.Subject, Email: claims.Email}
+	d.setSessionCookie(w, d.encodeSession(user, d.now().Add(d.sessionTTL)))
+	metrics.IncLogin()
 	http.Redirect(w, r, "/", http.StatusFound)
 }
 
 func (d *DexAuth) handleLogout(w http.ResponseWriter, r *http.Request) {
-	if sid, ok := d.sessionID(r); ok {
-		d.sessions.delete(sid)
-	}
+	// Stateless sessions: clearing the cookie logs the browser out. There is no
+	// server-side record to delete (ADR-029); a copy of the cookie stays valid
+	// until its expiry — an accepted trade for the Stage-0 reader app.
 	d.clearSessionCookie(w)
 	// Land on the public landing page, not the login endpoint: a just-logged-out
 	// visitor should see /welcome, not be bounced straight back into a Dex login.
@@ -287,22 +284,19 @@ func (d *DexAuth) redirectToLogin(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, loginPath, http.StatusFound)
 }
 
-func (d *DexAuth) sessionID(r *http.Request) (string, bool) {
-	c, err := r.Cookie(sessionCookie)
-	if err != nil {
-		return "", false
-	}
-	return d.unsign(c.Value)
-}
-
-func (d *DexAuth) setSessionCookie(w http.ResponseWriter, sid string) {
+// setSessionCookie writes the signed session value as a PERSISTENT cookie
+// (Max-Age set), so it survives the browser/app being closed — a session cookie
+// (no Max-Age) was dropped on iPhone Safari close, forcing re-login. value is the
+// already-signed payload from encodeSession.
+func (d *DexAuth) setSessionCookie(w http.ResponseWriter, value string) {
 	http.SetCookie(w, &http.Cookie{
 		Name:     sessionCookie,
-		Value:    d.sign(sid),
+		Value:    value,
 		Path:     "/",
 		HttpOnly: true,
 		Secure:   !d.insecure,
 		SameSite: http.SameSiteLaxMode,
+		MaxAge:   int(d.sessionTTL.Seconds()),
 	})
 }
 

internal/web/oidc/oidc_test.go

@@ -14,8 +14,8 @@ import (
 	josev4 "github.com/go-jose/go-jose/v4"
 	"github.com/stretchr/testify/require"
 
-	"gitea.d-ma.be/mathias/tapir/internal/web"
-	"gitea.d-ma.be/mathias/tapir/internal/web/oidc"
+	"git.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/web/oidc"
 )
 
 const (
@@ -306,13 +306,42 @@ func TestLogoutClearsSession(t *testing.T) {
 	require.Equal(t, http.StatusFound, rec.Code)
 	require.Equal(t, "/welcome", rec.Header().Get("Location"), "logout lands on the public page")
 	cleared := sessionCookie(t, rec.Result())
-	require.Less(t, cleared.MaxAge, 0, "logout expires the cookie")
+	require.Less(t, cleared.MaxAge, 0, "logout expires the cookie so the browser drops it")
+	require.Empty(t, cleared.Value, "logout blanks the cookie value")
 
-	// The server-side session is gone: the original cookie no longer resolves.
+	// Sessions are stateless (ADR-029): logout clears the cookie client-side, so a
+	// request carrying the cleared (empty) cookie is unauthenticated. The original
+	// signed cookie remains technically valid until its expiry — the accepted
+	// trade for no server-side store; the browser no longer holds it.
 	check := httptest.NewRequest(http.MethodGet, "/", nil)
-	check.AddCookie(cookie)
+	check.AddCookie(cleared)
 	_, ok := auth.CurrentUser(check)
-	require.False(t, ok)
+	require.False(t, ok, "the cleared cookie does not authenticate")
+}
+
+// TestSessionSurvivesRestart is the core of ADR-029: a cookie issued by one
+// process is accepted by a FRESH instance with the same session secret — so a
+// deploy/pod-restart no longer logs users out (the old in-memory store did).
+func TestSessionSurvivesRestart(t *testing.T) {
+	f := newFakeIssuer(t)
+	auth1 := newAuth(t, f)
+	cookie := authenticate(t, auth1, f)
+
+	auth2 := newAuth(t, f) // simulate a redeploy: new process, same SessionSecret
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.AddCookie(cookie)
+	user, ok := auth2.CurrentUser(req)
+	require.True(t, ok, "a session must survive a restart (stateless signed cookie)")
+	require.Equal(t, testSubject, user.Subject)
+}
+
+// TestSessionCookieIsPersistent: the cookie carries a positive Max-Age so it
+// survives the browser/app being closed (a session cookie was dropped on iOS).
+func TestSessionCookieIsPersistent(t *testing.T) {
+	f := newFakeIssuer(t)
+	auth := newAuth(t, f)
+	cookie := authenticate(t, auth, f)
+	require.Greater(t, cookie.MaxAge, 0, "session cookie must be persistent (Max-Age set)")
 }
 
 func TestExpiredSessionRejected(t *testing.T) {

internal/web/oidc/session.go

@@ -6,12 +6,13 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"strings"
 	"sync"
 	"time"
 
-	"gitea.d-ma.be/mathias/tapir/internal/web"
+	"git.d-ma.be/mathias/tapir/internal/web"
 )
 
 // randToken returns a URL-safe 256-bit random string for session IDs, OIDC
@@ -53,56 +54,44 @@ func (d *DexAuth) unsign(signed string) (string, bool) {
 	return value, true
 }
 
-// sessionData is the server-side session record.
-type sessionData struct {
-	user   web.User
-	expiry time.Time
+// sessionClaims is the self-contained session payload carried INSIDE the signed
+// cookie — there is no server-side session table. This is deliberate (ADR-029):
+// an in-memory store was wiped on every pod restart, logging every user out on
+// each deploy, and a stateless cookie also survives browser-close and works
+// across replicas. It holds only the identity (subject + email, not secret) and
+// an absolute expiry; the HMAC tag (sign/unsign) makes it tamper-proof.
+type sessionClaims struct {
+	Sub   string `json:"s"`
+	Email string `json:"e"`
+	Exp   int64  `json:"x"` // unix seconds; absolute expiry
 }
 
-// sessionStore is an in-memory session table. Single replica at Stage 0, so an
-// in-process map is sufficient; it is safe for concurrent use.
-type sessionStore struct {
-	mu sync.Mutex
-	m  map[string]sessionData
+// encodeSession produces the signed cookie value for a user with the given expiry.
+func (d *DexAuth) encodeSession(u web.User, exp time.Time) string {
+	b, _ := json.Marshal(sessionClaims{Sub: u.Subject, Email: u.Email, Exp: exp.Unix()})
+	return d.sign(base64.RawURLEncoding.EncodeToString(b))
 }
 
-func newSessionStore() *sessionStore { return &sessionStore{m: make(map[string]sessionData)} }
-
-func (s *sessionStore) put(id string, d sessionData) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	s.m[id] = d
-}
-
-// get returns the session if present and unexpired; expired entries are evicted.
-func (s *sessionStore) get(id string, now time.Time) (sessionData, bool) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	d, ok := s.m[id]
+// decodeSession verifies the cookie's HMAC, parses the claims, and checks expiry.
+// It returns the user and the absolute expiry on success.
+func (d *DexAuth) decodeSession(cookieValue string, now time.Time) (web.User, time.Time, bool) {
+	payload, ok := d.unsign(cookieValue)
 	if !ok {
-		return sessionData{}, false
+		return web.User{}, time.Time{}, false
 	}
-	if !now.Before(d.expiry) {
-		delete(s.m, id)
-		return sessionData{}, false
+	raw, err := base64.RawURLEncoding.DecodeString(payload)
+	if err != nil {
+		return web.User{}, time.Time{}, false
 	}
-	return d, true
-}
-
-// refresh slides an existing session's expiry forward; a no-op for unknown ids.
-func (s *sessionStore) refresh(id string, expiry time.Time) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	if d, ok := s.m[id]; ok {
-		d.expiry = expiry
-		s.m[id] = d
+	var c sessionClaims
+	if err := json.Unmarshal(raw, &c); err != nil {
+		return web.User{}, time.Time{}, false
 	}
-}
-
-func (s *sessionStore) delete(id string) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	delete(s.m, id)
+	exp := time.Unix(c.Exp, 0)
+	if !now.Before(exp) {
+		return web.User{}, time.Time{}, false // expired
+	}
+	return web.User{Subject: c.Sub, Email: c.Email}, exp, true
 }
 
 // pendingData holds the nonce bound to an in-flight authorization request.