docs: refresh build-state for transcript persistence (ADR-021)

Update the CLAUDE.md orientation block: last tag v0.14.0, migrations
001–015, and a transcript-persistence bullet (shared non-RLS store,
engine reads stored-first). The stale "v0.9.0" reference is corrected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -46,8 +46,9 @@ 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
+- **No global cross-tenant *video* table** — videos stay per-user (data-model). Transcripts ARE
-  across users is a Future C concern, not a Stage 0/1 default.
+  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 +86,7 @@ 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 `v0.14.0`. `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 +95,18 @@ 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),
+  Primary→Fallback per ADR-004), `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 +743,66 @@ 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.
+
+---
+
 ## Rejected alternatives
 
 Approaches considered during the 2026-06-02 planning + grill session and **deliberately not
@@ -757,7 +817,7 @@ 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) |

cmd/tapir/processor.go

@@ -63,7 +63,12 @@ func buildProcessor(cfg config.Config, st *store.Store) (*usecase.Engine, error)
 	}
 	sum := summarizer.New(primary, nil)
 
-	return usecase.NewEngine(src, sum, st), nil
+	// 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
 }
 
 // engineProcessor adapts the engine (which works in terms of a domain.Video) to

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
+- **Per-user isolation for everything except transcripts.** The earlier draft proposed a
-  global `videos`/`transcripts` table deduped across tenants. Rejected for Future B: it
+  global `videos`/`transcripts` table deduped across tenants. **Videos** stay per-user and
-  reintroduces exactly the cross-domain coupling the homelab architecture review is
+  RLS-scoped — a shared video table reintroduces exactly the cross-domain coupling the homelab
-  removing, and at 1–5 users the cost of occasionally re-summarizing the same video is
+  architecture review is removing. **Transcripts**, however, are now shared (ADR-021): keyed by
-  trivial compared to the isolation it would cost. Each user's data is self-contained.
+  `(provider, provider_video_id)`, no `user_id`, **not** RLS-scoped. The cost avoided there is
-  (Revisit only if Future C makes GPU/transcription cost dominate — a new ADR, not a default.)
+  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
+        text provider PK "part of shared key (ADR-021)"
-        uuid user_id FK
+        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** — shared public caption content, one row per `(provider, provider_video_id)`,
-  transcript" so the watcher doesn't reprocess (ADR-007). `content` null in that case.
+  **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/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.

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,
+// Deleting the users row cascades (ON DELETE CASCADE) to videos, summaries
-// summaries (→ sink_deliveries), video_connections, and the user_identities map
+// (→ sink_deliveries), video_connections, and the user_identities map —
-// — referential-integrity cascades bypass RLS, so a user's child rows are removed
+// 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
+// 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/migrate_test.go

@@ -53,7 +53,9 @@ func TestMigration010LoginEventsUpDown(t *testing.T) {
 	require.True(t, loginEventsExists(t), "login_events must exist at latest migration")
 
 	m := fileMigrator(t)
-	// 011, 012, 013, 014 sit above 010; step them down first so 010 is exercised in isolation.
+	// 011..015 sit above 010; step them down first so 010 is exercised in isolation.
+	require.NoError(t, m.Steps(-1), "down 015 reshapes transcripts, login_events intact")
+	require.True(t, loginEventsExists(t), "015 down leaves login_events intact")
 	require.NoError(t, m.Steps(-1), "down 014 drops channel_title, login_events intact")
 	require.True(t, loginEventsExists(t), "014 down leaves login_events intact")
 	require.NoError(t, m.Steps(-1), "down 013 drops channel_errors, login_events intact")
@@ -66,7 +68,7 @@ func TestMigration010LoginEventsUpDown(t *testing.T) {
 	require.NoError(t, m.Steps(-1), "down 010 must drop login_events")
 	require.False(t, loginEventsExists(t), "login_events must be gone after the down migration")
 
-	require.NoError(t, m.Steps(5), "up must recreate 010 then re-apply 011, 012, 013, 014")
+	require.NoError(t, m.Steps(6), "up must recreate 010 then re-apply 011..015")
 	require.True(t, loginEventsExists(t), "login_events must be restored after the up migration")
 }
 
@@ -89,6 +91,7 @@ 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 015 reshapes transcripts")
 	require.NoError(t, m.Steps(-1), "down 014 drops channel_title")
 	require.NoError(t, m.Steps(-1), "down 013 drops channel_errors")
 	require.NoError(t, m.Steps(-1), "down 012 is a no-op")
@@ -100,6 +103,7 @@ func TestMigration011AutoSummarizeDefaultUpDown(t *testing.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")
 	require.NoError(t, m.Steps(1), "up 014 recreates channel_title")
+	require.NoError(t, m.Steps(1), "up 015 reshapes transcripts to shared")
 }
 
 // channelTitleExists reports whether videos.channel_title is present.
@@ -119,11 +123,14 @@ func TestMigration014VideoChannelTitleUpDown(t *testing.T) {
 	require.True(t, channelTitleExists(t), "channel_title exists at latest migration")
 
 	m := fileMigrator(t)
+	require.NoError(t, m.Steps(-1), "down 015 reshapes transcripts, channel_title intact")
+	require.True(t, channelTitleExists(t), "015 down leaves channel_title intact")
 	require.NoError(t, m.Steps(-1), "down 014 must drop channel_title")
 	require.False(t, channelTitleExists(t), "channel_title must be gone after the down migration")
 
 	require.NoError(t, m.Steps(1), "up 014 must recreate channel_title")
 	require.True(t, channelTitleExists(t), "channel_title must be restored after the up migration")
+	require.NoError(t, m.Steps(1), "up 015 restores the shared transcripts shape (HEAD)")
 }
 
 // TestMigration012FixAutoSummarizeRLS proves 012 runs cleanly and flips any

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/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 →
+// seedUser inserts one full chain (user → video → summary → action → delivery)
-// action → delivery) as the superuser pool, which bypasses RLS so both users'
+// as the superuser pool, which bypasses RLS so both users' data lands regardless
-// data lands regardless of the GUC.
+// 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).
+	// Idempotent across tests AND runs: the role persists for the TestMain PG and
-	_, _ = super.Exec(ctx, `DROP ROLE IF EXISTS app`)
+	// owns granted privileges, so a plain DROP ROLE fails once any GRANT exists
-	_, err := super.Exec(ctx, `CREATE ROLE app LOGIN PASSWORD 'app'`)
+	// (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/transcript.go

@@ -0,0 +1,66 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/jackc/pgx/v5"
+
+	"gitea.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_test.go

@@ -0,0 +1,87 @@
+package store_test
+
+import (
+	"context"
+	"testing"
+
+	"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"
+)
+
+// 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/ports/ports.go

@@ -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/usecase/engine.go

@@ -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"
+
+	"gitea.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)
+	}
+}

test/acceptance/scenario_coverage_test.go

@@ -67,6 +67,7 @@ var scenarioCoverage = map[string]string{
 	"A subscribed channel posts a video with no usable transcript": "TestVideoWithNoTranscriptIsSkipped",
 	"A channel I am not subscribed to posts a video":               "TestUnsubscribedChannelVideoIsNotProcessed",
 	"The same video is not summarized twice":                       "TestAlreadySummarizedVideoIsNotReprocessed",
+	"Re-analyzing a stored video does not re-fetch its transcript": "TestProcessNewVideo_SecondSummarizeDoesNotRefetch",
 }
 
 var (