Merge pull request 'feat(uploads): choose the language of a recording; Swedish default, Other = auto (#61 interim)' (#62) from sprint/language into main

Low findings of the PR #62 re-review: the WithTimeout test's comment claimed cancellation
travels on the context but only the language was asserted (the WithoutCancel mutant survived),
and PlanFor('') and PlanFor(unknown) were untested.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

DECISIONS.md

@@ -1434,7 +1434,12 @@ an hour of Swedish *was* an unknown here; it is now measured, see decision 8.)
      empty disables), recorded per row, and called out in Open items rather than defaulted
      silently.
    - Swedish only (`language=sv`). Language detection and routing (#28 decision 2) are not
-     touched.
+     touched. **Amended 2026-10-04 (#61, interim):** the language is now a per-upload choice on
+     the form, `sv` (preselected, and what an upload that names none gets) or `auto` ("Other":
+     `language` is omitted so the engine detects it), a closed set held by the form, the request
+     code and a CHECK constraint on `uploaded_transcripts.language` (migration 021). Automatic
+     detection and a general-purpose engine for other languages are still not built (#61); an
+     `auto` upload goes to the same configured engine, which is not tuned for it.
    - `-H 'Expect:'`, multipart field `file` — encoded in the adapter and its tests, not rediscovered.
 
 7. **Jobs run in-process, one at a time (ADR-018 stands).** Transcription is minutes (~7.5 min
@@ -1645,6 +1650,10 @@ on the slow numbers and is reopened: 31B scored 97% against 92%.
    job timeout rises from 30 to 60 minutes: ~4 min of kb-whisper and ~40 s of pianissimo per hour of
    audio, plus the adjudication.
 
+   **Amended 2026-10-04 (#61, interim):** reconcile is for Swedish. A recording whose language is
+   `auto` is never sent to the base engine (it is Swedish-only) and is not reconciled: the other
+   engine transcribes alone, then the cloud fallback if that fails and the job is live, and the
+   page does not claim a second opinion.
 8. **Not decided here.** A cloud adjudicator (rejected: private content); tuning the prompt; making
    `gemma4-31b` the default; a "reconciling" progress state (the page says "transcribing" for the whole
    job); feeding the uncertain spots to chat; whether pianissimo should also be a middle tier in the

cmd/tapir/uploads_test.go

@@ -25,7 +25,7 @@ type fakeUploadsStore struct {
 	failedKinds []domain.UploadErrorKind
 }
 
-func (f *fakeUploadsStore) CreateUpload(context.Context, string, string, bool) (string, error) {
+func (f *fakeUploadsStore) CreateUpload(context.Context, string, string, domain.Language, bool) (string, error) {
 	return "id", nil
 }
 

docs/use-cases/audio_upload.feature

@@ -274,3 +274,20 @@ Feature: Upload an audio recording, get a private Swedish transcript, discuss it
   Scenario: Input that cannot be right is a client error
     When the id is not an id, or a header or title holds control bytes
     Then the answer is a 4xx or the title is cleaned, never a server error
+
+  Scenario: I choose the language of a recording
+    When I upload a recording and choose Swedish or Other on the form
+    Then the recording is transcribed as that language and its page says which
+
+  Scenario: Swedish stays the default
+    When an upload names no language
+    Then it is transcribed as Swedish, as before the choice existed
+
+  Scenario: A language outside the list is refused
+    When an upload names a language the form does not offer
+    Then it is answered 400 before anything is stored or sent to an engine
+
+  Scenario: A recording in another language never reaches the Swedish-only engine
+    When I choose Other for a recording
+    Then the language is left for the engine to detect and the Swedish-only base engine and the reconcile are not used
+    And the engine that does run is the configured one, which is not tuned for other languages

internal/adapters/store/migrations/021_uploaded_transcripts_language.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE uploaded_transcripts
+    DROP COLUMN language;

internal/adapters/store/migrations/021_uploaded_transcripts_language.up.sql

@@ -0,0 +1,13 @@
+-- Migration 021: the language an upload is transcribed as (tapir#61).
+--
+-- 'sv'   Swedish: the engines are sent language=sv. Every row before this migration was
+--        transcribed that way (the request hard-coded it), so the default is true history.
+-- 'auto' Other: the engine detects the language and the Swedish-only engine is not used.
+--
+-- A closed set held by the table as well as by the form and the request code, so a second
+-- writer or a bug cannot store a value the engines are never meant to receive. The column
+-- sits on the already-FORCE'd, RLS-scoped uploaded_transcripts, so the exact-set isolation
+-- test is unaffected.
+ALTER TABLE uploaded_transcripts
+    ADD COLUMN language TEXT NOT NULL DEFAULT 'sv'
+        CONSTRAINT uploaded_transcripts_language_check CHECK (language IN ('sv', 'auto'));

internal/adapters/store/uploaded_transcripts.go

@@ -31,12 +31,12 @@ var ErrUploadInProgress = errors.New("store: uploaded transcript is still being
 // CreateUpload records a new upload in the queued state and returns its id.
 // hadVideo records that the file carried a video track (only its audio is used);
 // it is kept for the life of the row so the page can say so.
-func (s *Store) CreateUpload(ctx context.Context, userID, title string, hadVideo bool) (string, error) {
+func (s *Store) CreateUpload(ctx context.Context, userID, title string, lang domain.Language, hadVideo bool) (string, error) {
 	var id string
 	if err := s.withUser(ctx, userID, func(tx pgx.Tx) error {
 		return tx.QueryRow(ctx,
-			`INSERT INTO uploaded_transcripts (user_id, title, had_video) VALUES ($1, $2, $3) RETURNING id`,
+			`INSERT INTO uploaded_transcripts (user_id, title, language, had_video) VALUES ($1, $2, $3, $4) RETURNING id`,
-			userID, title, hadVideo).Scan(&id)
+			userID, title, string(lang), hadVideo).Scan(&id)
 	}); err != nil {
 		return "", fmt.Errorf("store: create upload: %w", err)
 	}
@@ -221,7 +221,7 @@ func (s *Store) FailInterruptedUploads(ctx context.Context) (int, error) {
 	return total, nil
 }
 
-const uploadSelect = `SELECT id, user_id, title, status, content, segments, endpoint,
+const uploadSelect = `SELECT id, user_id, title, language, status, content, segments, endpoint,
        audio_seconds, error_kind, had_video, reconciliation, progress, progress_at, alive_at,
        created_at, finished_at FROM uploaded_transcripts`
 
@@ -234,11 +234,13 @@ func scanUpload(row pgx.Row, u *domain.UploadedTranscript, withText bool) error
 		seconds                            *float64
 		finished, progressAt, aliveAt      *time.Time
 	)
-	if err := row.Scan(&u.ID, &u.UserID, &u.Title, &status, &content, &segments, &endpoint,
+	var language string
+	if err := row.Scan(&u.ID, &u.UserID, &u.Title, &language, &status, &content, &segments, &endpoint,
 		&seconds, &errKind, &u.HadVideo, &reconciliation, &progress, &progressAt, &aliveAt,
 		&u.CreatedAt, &finished); err != nil {
 		return err
 	}
+	u.Language = domain.Language(language)
 	u.Status = domain.UploadStatus(deref(status))
 	u.Endpoint = deref(endpoint)
 	u.ErrorKind = domain.UploadErrorKind(deref(errKind))

internal/adapters/store/uploaded_transcripts_delete_test.go

@@ -42,7 +42,7 @@ func TestDeleteUpload_RefusesAnUploadThatIsStillQueuedOrTranscribingAndKeepsTheR
 	s := newStore(t)
 	ctx := context.Background()
 	queued := startedUpload(t, s)
-	running, err := s.CreateUpload(ctx, userA, "running", false)
+	running, err := s.CreateUpload(ctx, userA, "running", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, running))
 

internal/adapters/store/uploaded_transcripts_failguard_test.go

@@ -34,7 +34,7 @@ func TestFailUpload_StillFailsAQueuedOrTranscribingUpload(t *testing.T) {
 	s := newStore(t)
 	ctx := context.Background()
 	queued := startedUpload(t, s)
-	running, err := s.CreateUpload(ctx, userA, "r", false)
+	running, err := s.CreateUpload(ctx, userA, "r", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, running))
 

internal/adapters/store/uploaded_transcripts_progress_test.go

@@ -20,7 +20,7 @@ import (
 func startedUpload(t *testing.T, s *store.Store) string {
 	t.Helper()
 	seedUsers(t, userA, userB)
-	id, err := s.CreateUpload(context.Background(), userA, "m", false)
+	id, err := s.CreateUpload(context.Background(), userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 	return id
 }

internal/adapters/store/uploaded_transcripts_test.go

@@ -33,7 +33,7 @@ func TestCreateUpload_StartsQueuedAndIsOwnedByTheCreator(t *testing.T) {
 	seedUsers(t, userA)
 	ctx := context.Background()
 
-	id, err := s.CreateUpload(ctx, userA, "Teams export", false)
+	id, err := s.CreateUpload(ctx, userA, "Teams export", domain.LangSwedish, false)
 	require.NoError(t, err)
 
 	got, err := s.GetUpload(ctx, userA, id)
@@ -50,7 +50,7 @@ func TestUploadLifecycle_CompletedKeepsTextSegmentsEndpointAndDuration(t *testin
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "m", false)
+	id, err := s.CreateUpload(ctx, userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 
 	require.NoError(t, s.StartTranscribing(ctx, userA, id))
@@ -84,7 +84,7 @@ func TestUploadLifecycle_FailedRecordsTypedKindAndNoContent(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "m", false)
+	id, err := s.CreateUpload(ctx, userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, id))
 
@@ -102,7 +102,7 @@ func TestGetUpload_AnotherUsersIDIsNotFound(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA, userB)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "A's meeting", false)
+	id, err := s.CreateUpload(ctx, userA, "A's meeting", domain.LangSwedish, false)
 	require.NoError(t, err)
 
 	_, err = s.GetUpload(ctx, userB, id)
@@ -115,7 +115,7 @@ func TestUploadWrites_ByAnotherUserChangeNothing(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA, userB)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "A's meeting", false)
+	id, err := s.CreateUpload(ctx, userA, "A's meeting", domain.LangSwedish, false)
 	require.NoError(t, err)
 
 	assert.ErrorIs(t, s.StartTranscribing(ctx, userB, id), store.ErrUploadNotFound)
@@ -132,11 +132,11 @@ func TestListUploads_ReturnsOnlyTheCallersNewestFirstWithoutTranscriptText(t *te
 	s := newStore(t)
 	seedUsers(t, userA, userB)
 	ctx := context.Background()
-	first, err := s.CreateUpload(ctx, userA, "first", false)
+	first, err := s.CreateUpload(ctx, userA, "first", domain.LangSwedish, false)
 	require.NoError(t, err)
-	second, err := s.CreateUpload(ctx, userA, "second", false)
+	second, err := s.CreateUpload(ctx, userA, "second", domain.LangSwedish, false)
 	require.NoError(t, err)
-	_, err = s.CreateUpload(ctx, userB, "B's", false)
+	_, err = s.CreateUpload(ctx, userB, "B's", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, first))
 	require.NoError(t, s.CompleteUpload(ctx, userA, first, domain.Transcription{Text: "long text body", Endpoint: "e"}))
@@ -160,12 +160,12 @@ func TestFailInterruptedUploads_FailsOnlyUnfinishedRowsForEveryUser(t *testing.T
 		_, err := super.Exec(ctx, `INSERT INTO user_identities (dex_subject, user_id) VALUES ($1, $2)`, subject, uid)
 		require.NoError(t, err)
 	}
-	queued, err := s.CreateUpload(ctx, userA, "queued", false)
+	queued, err := s.CreateUpload(ctx, userA, "queued", domain.LangSwedish, false)
 	require.NoError(t, err)
-	running, err := s.CreateUpload(ctx, userB, "running", false)
+	running, err := s.CreateUpload(ctx, userB, "running", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userB, running))
-	done, err := s.CreateUpload(ctx, userA, "done", false)
+	done, err := s.CreateUpload(ctx, userA, "done", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, done))
 	require.NoError(t, s.CompleteUpload(ctx, userA, done, domain.Transcription{Text: "kept", Endpoint: "e"}))
@@ -191,9 +191,9 @@ func TestCreateUpload_RecordsWhetherTheFileHadAVideoTrack(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	withVideo, err := s.CreateUpload(ctx, userA, "camera off", true)
+	withVideo, err := s.CreateUpload(ctx, userA, "camera off", domain.LangSwedish, true)
 	require.NoError(t, err)
-	audioOnly, err := s.CreateUpload(ctx, userA, "voice only", false)
+	audioOnly, err := s.CreateUpload(ctx, userA, "voice only", domain.LangSwedish, false)
 	require.NoError(t, err)
 
 	gotVideo, err := s.GetUpload(ctx, userA, withVideo)
@@ -216,9 +216,9 @@ func TestUploadHadVideo_SurvivesCompletionAndFailure(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	done, err := s.CreateUpload(ctx, userA, "d", true)
+	done, err := s.CreateUpload(ctx, userA, "d", domain.LangSwedish, true)
 	require.NoError(t, err)
-	failed, err := s.CreateUpload(ctx, userA, "f", true)
+	failed, err := s.CreateUpload(ctx, userA, "f", domain.LangSwedish, true)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, done))
 	require.NoError(t, s.CompleteUpload(ctx, userA, done, domain.Transcription{Text: "x", Endpoint: "e"}))
@@ -235,7 +235,7 @@ func TestUploadLifecycle_ReconciliationRoundTripsWithItsContestedSpots(t *testin
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "m", false)
+	id, err := s.CreateUpload(ctx, userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, id))
 	want := &domain.Reconciliation{
@@ -258,7 +258,7 @@ func TestUploadLifecycle_ASingleEngineTranscriptHasNoReconciliation(t *testing.T
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "m", false)
+	id, err := s.CreateUpload(ctx, userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, id))
 	require.NoError(t, s.CompleteUpload(ctx, userA, id, domain.Transcription{Text: "x", Endpoint: "e"}))
@@ -273,7 +273,7 @@ func TestUploadLifecycle_ASkippedReconciliationKeepsItsReason(t *testing.T) {
 	s := newStore(t)
 	seedUsers(t, userA)
 	ctx := context.Background()
-	id, err := s.CreateUpload(ctx, userA, "m", false)
+	id, err := s.CreateUpload(ctx, userA, "m", domain.LangSwedish, false)
 	require.NoError(t, err)
 	require.NoError(t, s.StartTranscribing(ctx, userA, id))
 	rec := &domain.Reconciliation{Status: domain.ReconcileSkipped, Reason: "the model failed 3 times in a row: gateway down", Errors: 3}
@@ -284,3 +284,55 @@ func TestUploadLifecycle_ASkippedReconciliationKeepsItsReason(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, rec, got.Reconciliation)
 }
+
+func TestCreateUpload_RecordsTheLanguageTheUserChoseAndTheListCarriesIt(t *testing.T) {
+	s := newStore(t)
+	seedUsers(t, userA)
+	ctx := context.Background()
+	swedish, err := s.CreateUpload(ctx, userA, "sv", domain.LangSwedish, false)
+	require.NoError(t, err)
+	auto, err := s.CreateUpload(ctx, userA, "auto", domain.LangAuto, false)
+	require.NoError(t, err)
+
+	gotSv, err := s.GetUpload(ctx, userA, swedish)
+	require.NoError(t, err)
+	gotAuto, err := s.GetUpload(ctx, userA, auto)
+	require.NoError(t, err)
+	listed, err := s.ListUploads(ctx, userA)
+	require.NoError(t, err)
+
+	assert.Equal(t, domain.LangSwedish, gotSv.Language)
+	assert.Equal(t, domain.LangAuto, gotAuto.Language)
+	byID := map[string]domain.Language{}
+	for _, u := range listed {
+		byID[u.ID] = u.Language
+	}
+	assert.Equal(t, map[string]domain.Language{swedish: domain.LangSwedish, auto: domain.LangAuto}, byID)
+}
+
+// The closed set is also held by the table, so a bug or a second writer cannot store a
+// value the engines are never meant to receive (tapir#61).
+func TestUploadedTranscripts_TheTableRefusesALanguageOutsideTheClosedSet(t *testing.T) {
+	newStore(t)
+	seedUsers(t, userA)
+
+	_, err := rawPool(t).Exec(context.Background(),
+		`INSERT INTO uploaded_transcripts (user_id, title, language) VALUES ($1, 'x', 'en')`, userA)
+
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "language", "the CHECK constraint names the column")
+}
+
+// A row from before the column existed was transcribed as Swedish; the default says so.
+func TestUploadedTranscripts_ARowInsertedWithoutALanguageIsSwedish(t *testing.T) {
+	s := newStore(t)
+	seedUsers(t, userA)
+	var id string
+	require.NoError(t, rawPool(t).QueryRow(context.Background(),
+		`INSERT INTO uploaded_transcripts (user_id, title) VALUES ($1, 'old') RETURNING id`, userA).Scan(&id))
+
+	got, err := s.GetUpload(context.Background(), userA, id)
+
+	require.NoError(t, err)
+	assert.Equal(t, domain.LangSwedish, got.Language)
+}

internal/adapters/transcribe/ensemble.go

@@ -32,14 +32,24 @@ func NewEnsemble(base, alt, fallback Backend, adj reconcile.Adjudicator, opts re
 	return &Ensemble{base: base, alt: alt, fallback: fallback, adj: adj, opts: opts}
 }
 
-// Plan implements uploads.Planner: the phases this ensemble reports, so the page can
+// Plan implements uploads.Planner: the phases of a Swedish job, the two-engine one. The
-// show them before they run. The fallback is a phase only when one is configured.
+// fallback is a phase only when one is configured.
-func (e *Ensemble) Plan() []progress.Planned {
+func (e *Ensemble) Plan() []progress.Planned { return e.PlanFor(domain.LangSwedish) }
-	plan := []progress.Planned{
+
-		{Key: "engine_a", Label: "Transcribing with " + e.base.Name()},
+// PlanFor implements uploads.LanguagePlanner. A recording that is not Swedish never runs the
-		{Key: "engine_b", Label: "Transcribing with " + e.alt.Name()},
+// base engine, the comparison or the decisions (transcribeOther), so the page lists only
-		{Key: "compare", Label: "Comparing the two transcripts"},
+// what can run: the other engine, then the fallback if one is configured.
-		{Key: "decide", Label: "Deciding the differences"},
+func (e *Ensemble) PlanFor(lang domain.Language) []progress.Planned {
+	var plan []progress.Planned
+	if lang == domain.LangSwedish || lang == "" {
+		plan = []progress.Planned{
+			{Key: "engine_a", Label: "Transcribing with " + e.base.Name()},
+			{Key: "engine_b", Label: "Transcribing with " + e.alt.Name()},
+			{Key: "compare", Label: "Comparing the two transcripts"},
+			{Key: "decide", Label: "Deciding the differences"},
+		}
+	} else {
+		plan = []progress.Planned{{Key: "engine_b", Label: "Transcribing with " + e.alt.Name()}}
 	}
 	if e.fallback != nil {
 		plan = append(plan, progress.Planned{Key: "fallback", Label: "Cloud fallback (" + e.fallback.Name() + ")"})
@@ -51,6 +61,9 @@ func (e *Ensemble) Plan() []progress.Planned {
 // progress.Reporter in ctx (a no-op when nobody listens).
 func (e *Ensemble) Transcribe(ctx context.Context, wavPath string) (domain.Transcription, error) {
 	rep := progress.From(ctx)
+	if domain.LanguageFrom(ctx) != domain.LangSwedish {
+		return e.transcribeOther(ctx, rep, wavPath)
+	}
 	b, berr := e.run(ctx, rep, "engine_a", e.base, wavPath)
 	if err := ctx.Err(); err != nil {
 		return domain.Transcription{}, err
@@ -89,6 +102,28 @@ func (e *Ensemble) Transcribe(ctx context.Context, wavPath string) (domain.Trans
 	return e.single(f, e.fallback.Name(), "both local engines failed"), nil
 }
 
+// transcribeOther handles a recording that is not Swedish (tapir#61). The base engine is
+// Swedish-only, so it never receives the audio, and with one reading there is nothing to
+// reconcile: the other engine transcribes alone, then the cloud fallback if it fails and the
+// job is still live. The phases that did not run are shown as skipped by the tracker.
+func (e *Ensemble) transcribeOther(ctx context.Context, rep progress.Reporter, wavPath string) (domain.Transcription, error) {
+	t, err := e.run(ctx, rep, "engine_b", e.alt, wavPath)
+	if err == nil {
+		t.Endpoint = e.alt.Name()
+		return t, nil
+	}
+	if e.fallback == nil || ctx.Err() != nil {
+		return domain.Transcription{}, fmt.Errorf("%s: %w", e.alt.Name(), err)
+	}
+	f, ferr := e.run(ctx, rep, "fallback", e.fallback, wavPath)
+	if ferr != nil {
+		return domain.Transcription{}, errors.Join(
+			fmt.Errorf("%s: %w", e.alt.Name(), err), fmt.Errorf("%s: %w", e.fallback.Name(), ferr))
+	}
+	f.Endpoint = e.fallback.Name()
+	return f, nil
+}
+
 // run is one engine call, reported as a phase. A job that was stopped is not a broken
 // engine, so a cancelled context is never reported as a failed phase.
 func (e *Ensemble) run(ctx context.Context, rep progress.Reporter, key string, be Backend, wav string) (domain.Transcription, error) {

internal/adapters/transcribe/ensemble_progress_test.go

@@ -160,3 +160,25 @@ func TestEnsembleProgress_TheReconcileCountsAreNotedForTheOperator(t *testing.T)
 	assert.Equal(t, 0, n["unsure"])
 	assert.Equal(t, 0, n["errors"])
 }
+
+// An auto-language upload never runs the base engine, the comparison or the decisions, so the
+// page must not list them as coming (tapir#61, PR #62 review).
+func TestEnsemblePlanFor_AnAutoLanguageListsOnlyThePhasesThatCanRun(t *testing.T) {
+	with := newEnsemble("a", "a", nil, nil, true, &verdictAdj{}).e
+	without := newEnsemble("a", "a", nil, nil, false, &verdictAdj{}).e
+	keys := func(p []progress.Planned) []string {
+		var k []string
+		for _, s := range p {
+			k = append(k, s.Key)
+		}
+		return k
+	}
+
+	assert.Equal(t, []string{"engine_b", "fallback"}, keys(with.PlanFor(domain.LangAuto)))
+	assert.Equal(t, []string{"engine_b"}, keys(without.PlanFor(domain.LangAuto)), "no fallback configured: none promised")
+	assert.Equal(t, with.Plan(), with.PlanFor(domain.LangSwedish), "Swedish is the plan it always was")
+	assert.Contains(t, with.PlanFor(domain.LangAuto)[0].Label, "iguana/kb-whisper")
+	assert.Equal(t, with.Plan(), with.PlanFor(""), "a job queued before the choice existed is Swedish")
+	assert.Equal(t, with.PlanFor(domain.LangAuto), with.PlanFor(domain.Language("xx")),
+		"an unknown language is planned as it is run: not the Swedish phases")
+}

internal/adapters/transcribe/ensemble_test.go

@@ -204,3 +204,52 @@ func TestEnsemble_AShutdownDuringTheSecondEngineIsAnErrorNotASingleEngineSuccess
 	assert.ErrorIs(t, err, context.Canceled, "a cancelled job must not be recorded as 'kb-whisper failed'")
 	assert.Empty(t, got.Text)
 }
+
+// The base engine is Swedish-only. A recording that is not Swedish must never reach it, and
+// there is no second opinion to reconcile: the other engine transcribes alone (tapir#61).
+
+func autoCtx() context.Context { return domain.WithLanguage(context.Background(), domain.LangAuto) }
+
+func TestEnsemble_AnAutoLanguageUploadNeverReachesTheBaseEngineAndIsNotReconciled(t *testing.T) {
+	adj := &verdictAdj{v: reconcile.VerdictAlt}
+	r := newEnsemble("base text", "alt text", nil, nil, true, adj)
+
+	got, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.NoError(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper"}, *r.calls, "only the other engine is called")
+	assert.Zero(t, adj.calls, "nothing is adjudicated")
+	assert.Equal(t, "alt text", got.Text)
+	assert.Equal(t, "iguana/kb-whisper", got.Endpoint)
+	assert.Nil(t, got.Reconciliation, "reconciliation does not apply, so none is recorded")
+}
+
+func TestEnsemble_AnAutoLanguageUploadFallsBackWhenItsEngineFailsAndStillSkipsTheBaseEngine(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), true, &verdictAdj{})
+
+	got, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.NoError(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper", "berget/kb-whisper"}, *r.calls)
+	assert.Equal(t, "berget/kb-whisper", got.Endpoint)
+}
+
+func TestEnsemble_AnAutoLanguageUploadWithNoFallbackFailsWithoutTouchingTheBaseEngine(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), false, &verdictAdj{})
+
+	_, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.Error(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper"}, *r.calls)
+}
+
+func TestEnsemble_ACancelledAutoLanguageJobDoesNotReachTheFallback(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), true, &verdictAdj{})
+	ctx, cancel := context.WithCancel(autoCtx())
+	cancel()
+
+	_, err := r.e.Transcribe(ctx, "/a.wav")
+
+	require.Error(t, err)
+	assert.NotContains(t, *r.calls, "berget/kb-whisper", "a stopped job must not ship its audio to a cloud endpoint")
+}

internal/adapters/transcribe/gateway.go

@@ -71,9 +71,20 @@ func (g *Gateway) Transcribe(ctx context.Context, path string) (domain.Transcrip
 		return domain.Transcription{}, fmt.Errorf("transcribe: stat audio: %w", err)
 	}
 
+	// The language is one request field and a closed set: sv is sent, auto sends nothing so
+	// the engine detects it, and anything else never leaves this process (tapir#61).
+	fields := [][2]string{{"model", g.model}, {"response_format", "verbose_json"}}
+	switch lang := domain.LanguageFrom(ctx); lang {
+	case domain.LangSwedish:
+		fields = append(fields, [2]string{"language", string(lang)})
+	case domain.LangAuto:
+	default:
+		return domain.Transcription{}, fmt.Errorf("transcribe: language %q is not one tapir sends", lang)
+	}
+
 	var prefix bytes.Buffer
 	mw := multipart.NewWriter(&prefix)
-	for _, kv := range [][2]string{{"model", g.model}, {"response_format", "verbose_json"}, {"language", "sv"}} {
+	for _, kv := range fields {
 		if err := mw.WriteField(kv[0], kv[1]); err != nil {
 			return domain.Transcription{}, fmt.Errorf("transcribe: build request: %w", err)
 		}

internal/adapters/transcribe/gateway_test.go

@@ -255,3 +255,48 @@ func TestGateway_AnErrorBodyIsBoundedToTwoHundredBytesInTheStatusError(t *testin
 	require.ErrorAs(t, err, &se)
 	assert.LessOrEqual(t, len(se.Snippet), 200, "a gateway's whole body must not become part of an error")
 }
+
+// The language travels on the context (tapir#61); the request field is the only place it
+// takes effect, so these observe the request the gateway fake received.
+
+func TestGateway_SendsLanguageSvWhenTheContextCarriesNoneAndForSwedish(t *testing.T) {
+	for name, ctx := range map[string]context.Context{
+		"no language in the context": context.Background(),
+		"swedish":                    domain.WithLanguage(context.Background(), domain.LangSwedish),
+	} {
+		t.Run(name, func(t *testing.T) {
+			var got seen
+			srv := serve(t, 200, verboseJSON, &got)
+			g := transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client())
+
+			_, err := g.Transcribe(ctx, wavFile(t, "RIFF-synthetic-pcm"))
+
+			require.NoError(t, err)
+			assert.Equal(t, "sv", got.fields["language"])
+		})
+	}
+}
+
+func TestGateway_OmitsTheLanguageFieldForAnAutoContextSoTheEngineDetectsIt(t *testing.T) {
+	var got seen
+	srv := serve(t, 200, verboseJSON, &got)
+	g := transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client())
+
+	_, err := g.Transcribe(domain.WithLanguage(context.Background(), domain.LangAuto), wavFile(t, "RIFF-synthetic-pcm"))
+
+	require.NoError(t, err)
+	_, present := got.fields["language"]
+	assert.False(t, present, "an auto upload must not be forced to Swedish")
+	assert.Equal(t, "iguana/kb-whisper", got.fields["model"], "the rest of the request is unchanged")
+}
+
+func TestGateway_ALanguageOutsideTheClosedSetIsRefusedBeforeAnythingIsSent(t *testing.T) {
+	var got seen
+	srv := serve(t, 200, verboseJSON, &got)
+	g := transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client())
+
+	_, err := g.Transcribe(domain.WithLanguage(context.Background(), domain.Language("en")), wavFile(t, "RIFF-synthetic-pcm"))
+
+	require.Error(t, err)
+	assert.Empty(t, got.method, "no request may reach the engine with a language the closed set does not hold")
+}

internal/adapters/transcribe/timeout_test.go

@@ -102,3 +102,45 @@ func TestEnsemble_AHungEngineIsASoftFailureAndTheOtherEnginesTextIsUsed(t *testi
 	assert.Contains(t, got.Reconciliation.Reason, "timeout")
 	assert.False(t, errors.Is(err, context.DeadlineExceeded))
 }
+
+// WithTimeout sits in front of both local engines in production (cmd/tapir/uploads.go). It
+// must hand the engine the job's context, not a fresh one: the language and the
+// cancellation both travel on it (tapir#61).
+
+func TestWithTimeout_TheEngineStillReceivesTheLanguageOfTheJob(t *testing.T) {
+	for name, tt := range map[string]struct {
+		ctx       context.Context
+		wantField bool
+	}{
+		"auto leaves the field out": {domain.WithLanguage(context.Background(), domain.LangAuto), false},
+		"swedish sends sv":          {domain.WithLanguage(context.Background(), domain.LangSwedish), true},
+	} {
+		t.Run(name, func(t *testing.T) {
+			var got seen
+			srv := serve(t, 200, verboseJSON, &got)
+			b := transcribe.WithTimeout(transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client()), time.Minute)
+
+			_, err := b.Transcribe(tt.ctx, wavFile(t, "RIFF-synthetic-pcm"))
+
+			require.NoError(t, err)
+			lang, present := got.fields["language"]
+			assert.Equal(t, tt.wantField, present)
+			if tt.wantField {
+				assert.Equal(t, "sv", lang)
+			}
+		})
+	}
+}
+
+func TestWithTimeout_ACancelledJobIsNotRestartedByTheWrapper(t *testing.T) {
+	var got seen
+	srv := serve(t, 200, verboseJSON, &got)
+	b := transcribe.WithTimeout(transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client()), time.Minute)
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	_, err := b.Transcribe(ctx, wavFile(t, "RIFF-synthetic-pcm"))
+
+	require.Error(t, err)
+	assert.Empty(t, got.method, "a cancelled job must not send its audio anywhere through the wrapper")
+}

internal/domain/domain.go

@@ -243,9 +243,12 @@ const (
 // never stored in, or merged with, the shared public-caption Transcript (ADR-021).
 // Content and Segments are empty until Status is UploadDone.
 type UploadedTranscript struct {
-	ID           string
+	ID     string
-	UserID       string
+	UserID string
-	Title        string
+	Title  string
+	// Language is what the upload was (or will be) transcribed as: sv, or auto for
+	// "Other" (tapir#61).
+	Language     Language
 	Status       UploadStatus
 	Content      string
 	Segments     []Segment

internal/domain/language.go

@@ -0,0 +1,47 @@
+package domain
+
+import "context"
+
+// Language is the spoken language an upload is transcribed as. It is chosen by the user on
+// the upload form and reaches the engines as one request field, so it is a closed set,
+// never free text (tapir#61).
+type Language string
+
+const (
+	// LangSwedish sends language=sv: the Swedish engines' own language, and what every
+	// upload was transcribed as before the choice existed.
+	LangSwedish Language = "sv"
+	// LangAuto sends no language, so the engine detects it. It is what "Other" on the form
+	// means: the Swedish-only engines are not used for it.
+	LangAuto Language = "auto"
+)
+
+// ParseLanguage reads a form value. An empty value is Swedish (a client that predates the
+// field); anything that is not exactly a known value is refused rather than normalised.
+func ParseLanguage(s string) (Language, bool) {
+	switch Language(s) {
+	case "", LangSwedish:
+		return LangSwedish, true
+	case LangAuto:
+		return LangAuto, true
+	}
+	return "", false
+}
+
+type languageKey struct{}
+
+// WithLanguage returns a context that carries the language of the job it serves. The
+// Transcriber interface does not change: engines read it with LanguageFrom, the same way
+// they read the progress Reporter (ADR-035).
+func WithLanguage(ctx context.Context, l Language) context.Context {
+	return context.WithValue(ctx, languageKey{}, l)
+}
+
+// LanguageFrom returns the language carried by ctx, or Swedish when it carries none, so a
+// caller that sets nothing behaves as it always did.
+func LanguageFrom(ctx context.Context) Language {
+	if l, ok := ctx.Value(languageKey{}).(Language); ok && l != "" {
+		return l
+	}
+	return LangSwedish
+}

internal/domain/language_test.go

@@ -0,0 +1,41 @@
+package domain_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
+)
+
+func TestParseLanguage_KnownValuesAndEmptyAreAcceptedEverythingElseIsNot(t *testing.T) {
+	tests := []struct {
+		in     string
+		want   domain.Language
+		wantOK bool
+	}{
+		{"sv", domain.LangSwedish, true},
+		{"auto", domain.LangAuto, true},
+		{"", domain.LangSwedish, true}, // a client that sends no field keeps today's behaviour
+		{"SV", "", false},              // exact match: the value reaches a request field
+		{" sv", "", false},
+		{"sv\n", "", false},
+		{"en", "", false}, // a specific other language is not offered yet
+		{"sv,en", "", false},
+		{"../sv", "", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.in, func(t *testing.T) {
+			got, ok := domain.ParseLanguage(tt.in)
+			assert.Equal(t, tt.wantOK, ok)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
+func TestLanguageFrom_IsSwedishWhenTheContextCarriesNoneAndOtherwiseWhatWasSet(t *testing.T) {
+	assert.Equal(t, domain.LangSwedish, domain.LanguageFrom(context.Background()))
+	ctx := domain.WithLanguage(context.Background(), domain.LangAuto)
+	assert.Equal(t, domain.LangAuto, domain.LanguageFrom(ctx))
+}

internal/uploads/intake.go

@@ -25,7 +25,7 @@ type Prober interface {
 
 // Store is the slice of the private transcript store the intake needs.
 type Store interface {
-	CreateUpload(ctx context.Context, userID, title string, hadVideo bool) (string, error)
+	CreateUpload(ctx context.Context, userID, title string, lang domain.Language, hadVideo bool) (string, error)
 	FailUpload(ctx context.Context, userID, id string, kind domain.UploadErrorKind) error
 }
 
@@ -35,6 +35,9 @@ type Job struct {
 	UserID   string
 	UploadID string
 	Path     string
+	// Language is what the user chose for this recording; empty means Swedish (a job
+	// queued before the choice existed).
+	Language domain.Language
 	// Duration is what the file CLAIMED when probed. The worker compares it with what
 	// was really converted; zero means unknown (ADR-035 review).
 	Duration time.Duration
@@ -135,7 +138,7 @@ const busyMessage = "Too many recordings are waiting to be transcribed. Please t
 // validation yields a *RejectError and creates NO row — rejection is synchronous
 // and leaves nothing behind. On success the temp file is handed to the job and the
 // worker deletes it; on every failure path Accept deletes it itself.
-func (in *Intake) Accept(ctx context.Context, userID, title string, src io.Reader) (string, error) {
+func (in *Intake) Accept(ctx context.Context, userID, title string, lang domain.Language, src io.Reader) (string, error) {
 	// Refuse before spooling when the queue has no room, if the submitter can say so: a full
 	// queue otherwise cost up to the upload cap on disk, an ffprobe run and a failed row for
 	// every refused attempt.
@@ -190,11 +193,11 @@ func (in *Intake) Accept(ctx context.Context, userID, title string, src io.Reade
 		return "", err
 	}
 
-	id, err := in.store.CreateUpload(ctx, userID, title, probe.HasVideo)
+	id, err := in.store.CreateUpload(ctx, userID, title, lang, probe.HasVideo)
 	if err != nil {
 		return "", fmt.Errorf("uploads: create: %w", err)
 	}
-	if err := in.sub.Submit(Job{UserID: userID, UploadID: id, Path: path, Duration: probe.Duration}); err != nil {
+	if err := in.sub.Submit(Job{UserID: userID, UploadID: id, Path: path, Language: lang, Duration: probe.Duration}); err != nil {
 		if errors.Is(err, ErrQueueFull) {
 			// The user's to retry, not a server fault: refuse it as such, and do not leave
 			// the row queued -- that is the stuck spinner.

internal/uploads/intake_busy_test.go

@@ -23,7 +23,7 @@ func TestAccept_AFullQueueIsABusyRejectionNotAServerErrorAndLeavesNothingBehind(
 	r := newRig(t)
 	r.sub.err = uploads.ErrQueueFull
 
-	_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	var rej *uploads.RejectError
 	require.True(t, errors.As(err, &rej), "a full queue must be a rejection the web layer can answer with 429: %v", err)
@@ -48,7 +48,7 @@ func TestAccept_ANoRoomQueueIsRefusedBeforeAnythingIsSpooledProbedOrStored(t *te
 	full := &roomSubmitter{room: false}
 	in := uploads.NewIntake(r.st, r.pr, full, uploads.Limits{MaxBytes: 1024, MaxDuration: 90 * time.Minute}, r.tmp)
 
-	_, err := in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	var rej *uploads.RejectError
 	require.True(t, errors.As(err, &rej))
@@ -62,7 +62,7 @@ func TestAccept_ANoRoomQueueIsRefusedBeforeAnythingIsSpooledProbedOrStored(t *te
 func TestAccept_ASubmitterThatCannotSayStillWorksAsBefore(t *testing.T) {
 	r := newRig(t)
 
-	_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	require.NoError(t, err, "a Submitter without HasRoom is accepted: the check at Submit remains")
 }
@@ -81,7 +81,7 @@ func (b *brokenBody) Read(p []byte) (int, error) {
 func TestAccept_AnErrorReadingTheClientsBodyIsMarkedAsTheClientsAndAWrappedSubmitErrorIsNot(t *testing.T) {
 	r := newRig(t)
 
-	_, err := r.in.Accept(context.Background(), "user-1", "t", &brokenBody{n: 1})
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, &brokenBody{n: 1})
 
 	require.Error(t, err)
 	assert.ErrorIs(t, err, uploads.ErrClientRead, "a dropped client body is the sender's to retry")
@@ -90,7 +90,7 @@ func TestAccept_AnErrorReadingTheClientsBodyIsMarkedAsTheClientsAndAWrappedSubmi
 	// A fault that is ours must NOT carry the marker, even if it wraps the same sentinel.
 	r2 := newRig(t)
 	r2.sub.err = fmt.Errorf("db: %w", io.ErrUnexpectedEOF)
-	_, err = r2.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err = r2.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 	require.Error(t, err)
 	assert.NotErrorIs(t, err, uploads.ErrClientRead)
 }

internal/uploads/intake_concurrency_test.go

@@ -15,6 +15,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"git.d-ma.be/mathias/tapir/internal/domain"
 	"git.d-ma.be/mathias/tapir/internal/uploads"
 )
 
@@ -31,7 +32,7 @@ func startSlowReceive(t *testing.T, r *rig, in *uploads.Intake, user string, wan
 	pr, pw := io.Pipe()
 	s := &slowReceive{w: pw, done: make(chan error, 1)}
 	go func() {
-		_, err := in.Accept(context.Background(), user, "t", pr)
+		_, err := in.Accept(context.Background(), user, "t", domain.LangSwedish, pr)
 		s.done <- err
 	}()
 	require.Eventually(t, func() bool { return len(r.tmpFiles(t)) == wantFiles }, 2*time.Second, 5*time.Millisecond,
@@ -80,7 +81,7 @@ func TestAccept_APerUserLimitOnConcurrentReceivesRefusesTheNextBodyBeforeSpoolin
 	startSlowReceive(t, r, in, "user-1", 1)
 	startSlowReceive(t, r, in, "user-1", 2)
 
-	_, err := in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	requireBusy(t, err)
 	assert.Len(t, r.tmpFiles(t), 2, "the refused body was never spooled")
@@ -98,7 +99,7 @@ func TestAccept_AnOverallLimitOnConcurrentReceivesRefusesTheNextUser(t *testing.
 		startSlowReceive(t, r, in, u, i+1)
 	}
 
-	_, err := in.Accept(context.Background(), "d", "t", strings.NewReader("data"))
+	_, err := in.Accept(context.Background(), "d", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	requireBusy(t, err)
 	assert.Len(t, r.tmpFiles(t), 3)
@@ -112,7 +113,7 @@ func TestAccept_AFinishedReceiveFreesItsSlot(t *testing.T) {
 	first := startSlowReceive(t, r, in, "user-1", 1)
 	require.NoError(t, first.finish(t))
 
-	_, err := in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	require.NoError(t, err, "the slot is released when Accept returns")
 }
@@ -122,10 +123,10 @@ func TestAccept_AFailedReceiveFreesItsSlot(t *testing.T) {
 	in := uploads.NewIntake(r.st, r.pr, r.sub, uploads.Limits{MaxBytes: 1024, MaxDuration: time.Hour}, r.tmp)
 	in.MaxReceivesPerUser = 1
 	in.MaxReceives = 5
-	_, err := in.Accept(context.Background(), "user-1", "t", &brokenBody{n: 1})
+	_, err := in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, &brokenBody{n: 1})
 	require.ErrorIs(t, err, uploads.ErrClientRead)
 
-	_, err = in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err = in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	require.NoError(t, err, "a dropped client must not leak a slot")
 }

internal/uploads/intake_defaults_test.go

@@ -12,6 +12,7 @@ import (
 	"testing"
 	"time"
 
+	"git.d-ma.be/mathias/tapir/internal/domain"
 	"git.d-ma.be/mathias/tapir/internal/uploads"
 )
 
@@ -21,11 +22,11 @@ func TestNewIntake_DefaultsAllowTwoReceivesPerUserAndFourOverall(t *testing.T) {
 	startSlowReceive(t, r, in, "a", 1)
 	startSlowReceive(t, r, in, "a", 2)
 
-	_, err := in.Accept(context.Background(), "a", "t", strings.NewReader("x"))
+	_, err := in.Accept(context.Background(), "a", "t", domain.LangSwedish, strings.NewReader("x"))
 	requireBusy(t, err) // a third body from one user
 
 	startSlowReceive(t, r, in, "b", 3)
 	startSlowReceive(t, r, in, "b", 4)
-	_, err = in.Accept(context.Background(), "c", "t", strings.NewReader("x"))
+	_, err = in.Accept(context.Background(), "c", "t", domain.LangSwedish, strings.NewReader("x"))
 	requireBusy(t, err) // a fifth body overall
 }

internal/uploads/intake_test.go

@@ -21,13 +21,15 @@ import (
 
 type fakeStore struct {
 	created  []string // titles
+	langs    []domain.Language
 	hadVideo []bool
 	failed   map[string]domain.UploadErrorKind
 	nextID   string
 }
 
-func (f *fakeStore) CreateUpload(_ context.Context, _, title string, hadVideo bool) (string, error) {
+func (f *fakeStore) CreateUpload(_ context.Context, _, title string, lang domain.Language, hadVideo bool) (string, error) {
 	f.created = append(f.created, title)
+	f.langs = append(f.langs, lang)
 	f.hadVideo = append(f.hadVideo, hadVideo)
 	return f.nextID, nil
 }
@@ -98,7 +100,7 @@ func TestAccept_ValidAudioIsStoredProbedQueuedAndSubmitted(t *testing.T) {
 	r := newRig(t)
 	audio := bytes.Repeat([]byte("a"), 500)
 
-	id, err := r.in.Accept(context.Background(), "user-1", "Teams export", bytes.NewReader(audio))
+	id, err := r.in.Accept(context.Background(), "user-1", "Teams export", domain.LangSwedish, bytes.NewReader(audio))
 
 	require.NoError(t, err)
 	assert.Equal(t, "up-1", id)
@@ -106,7 +108,7 @@ func TestAccept_ValidAudioIsStoredProbedQueuedAndSubmitted(t *testing.T) {
 	assert.Equal(t, audio, r.pr.seen, "the prober must see the complete uploaded bytes, on disk")
 	require.Len(t, r.sub.jobs, 1)
 	job := r.sub.jobs[0]
-	assert.Equal(t, uploads.Job{UserID: "user-1", UploadID: "up-1", Path: job.Path, Duration: 10 * time.Minute}, job,
+	assert.Equal(t, uploads.Job{UserID: "user-1", UploadID: "up-1", Path: job.Path, Duration: 10 * time.Minute, Language: domain.LangSwedish}, job,
 		"the job carries what the file CLAIMED, so the worker can compare it with what was converted")
 	assert.Equal(t, filepath.Dir(job.Path), r.tmp, "the temp file lives in the configured directory")
 	got, err := os.ReadFile(job.Path)
@@ -117,7 +119,7 @@ func TestAccept_ValidAudioIsStoredProbedQueuedAndSubmitted(t *testing.T) {
 func TestAccept_OversizeBodyIsRejectedAndLeavesNothingBehind(t *testing.T) {
 	r := newRig(t)
 
-	_, err := r.in.Accept(context.Background(), "user-1", "big", strings.NewReader(strings.Repeat("a", 1025)))
+	_, err := r.in.Accept(context.Background(), "user-1", "big", domain.LangSwedish, strings.NewReader(strings.Repeat("a", 1025)))
 
 	var rej *uploads.RejectError
 	require.True(t, errors.As(err, &rej))
@@ -132,7 +134,7 @@ func TestAccept_OversizeBodyIsRejectedAndLeavesNothingBehind(t *testing.T) {
 func TestAccept_BodyExactlyAtTheLimitIsAccepted(t *testing.T) {
 	r := newRig(t)
 
-	_, err := r.in.Accept(context.Background(), "user-1", "edge", strings.NewReader(strings.Repeat("a", 1024)))
+	_, err := r.in.Accept(context.Background(), "user-1", "edge", domain.LangSwedish, strings.NewReader(strings.Repeat("a", 1024)))
 
 	require.NoError(t, err)
 }
@@ -152,7 +154,7 @@ func TestAccept_ProbeVerdictRejectsWithoutRowAndRemovesTheFile(t *testing.T) {
 			r := newRig(t)
 			r.pr.probe = tt.probe
 
-			_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+			_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 			var rej *uploads.RejectError
 			require.True(t, errors.As(err, &rej))
@@ -169,7 +171,7 @@ func TestAccept_UnreadableFileIsARejectionButAProberFaultIsAnError(t *testing.T)
 		r := newRig(t)
 		r.pr.err = uploads.ErrUnreadable
 
-		_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("not media"))
+		_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("not media"))
 
 		var rej *uploads.RejectError
 		require.True(t, errors.As(err, &rej), "the user's file is the problem: tell them")
@@ -180,7 +182,7 @@ func TestAccept_UnreadableFileIsARejectionButAProberFaultIsAnError(t *testing.T)
 		r := newRig(t)
 		r.pr.err = errors.New("exec: ffprobe: executable file not found")
 
-		_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+		_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 		require.Error(t, err)
 		var rej *uploads.RejectError
@@ -194,7 +196,7 @@ func TestAccept_ClientDisconnectMidUploadLeavesNothingBehind(t *testing.T) {
 	r := newRig(t)
 	body := io.MultiReader(strings.NewReader("partial"), iotest.ErrReader(errors.New("client went away")))
 
-	_, err := r.in.Accept(context.Background(), "user-1", "t", body)
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, body)
 
 	require.Error(t, err)
 	assert.Empty(t, r.pr.paths)
@@ -206,7 +208,7 @@ func TestAccept_SubmitFailureFailsTheRowHonestlyAndRemovesTheFile(t *testing.T)
 	r := newRig(t)
 	r.sub.err = errors.New("worker stopped")
 
-	_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 	require.Error(t, err)
 	assert.Equal(t, domain.UploadErrInterrupted, r.st.failed["up-1"],
@@ -228,7 +230,7 @@ func TestAccept_AFileWithAVideoTrackIsAcceptedAndRecordsThatItHadOne(t *testing.
 			r := newRig(t)
 			r.pr.probe = tt.probe
 
-			id, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+			id, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangSwedish, strings.NewReader("data"))
 
 			require.NoError(t, err)
 			assert.Equal(t, "up-1", id)
@@ -238,3 +240,14 @@ func TestAccept_AFileWithAVideoTrackIsAcceptedAndRecordsThatItHadOne(t *testing.
 		})
 	}
 }
+
+func TestAccept_TheChosenLanguageIsStoredAndHandedToTheJob(t *testing.T) {
+	r := newRig(t)
+
+	_, err := r.in.Accept(context.Background(), "user-1", "t", domain.LangAuto, strings.NewReader("data"))
+
+	require.NoError(t, err)
+	assert.Equal(t, []domain.Language{domain.LangAuto}, r.st.langs, "the row records what the user chose")
+	require.Len(t, r.sub.jobs, 1)
+	assert.Equal(t, domain.LangAuto, r.sub.jobs[0].Language, "the worker is told, so the engines are")
+}

internal/uploads/worker.go

@@ -33,6 +33,13 @@ type Transcriber interface {
 	Transcribe(ctx context.Context, wavPath string) (domain.Transcription, error)
 }
 
+// LanguagePlanner is a Planner whose phases depend on the language of the job: a recording
+// that is not Swedish skips the second engine and the reconcile, and the page should not list
+// them as coming (tapir#61). The worker prefers it over Planner.
+type LanguagePlanner interface {
+	PlanFor(lang domain.Language) []progress.Planned
+}
+
 // Planner is an optional extra on a Transcriber: it declares its own phases (for
 // example one per engine) so the page can show them. A Transcriber that does not
 // implement it gets a single "transcribing" phase from the worker. Whatever a Planner
@@ -251,8 +258,14 @@ func (w *Worker) Process(ctx context.Context, job Job) {
 	}
 
 	plan := []progress.Planned{{Key: "received", Label: "Received"}, {Key: "audio", Label: "Preparing the audio"}}
+	lang := job.Language
+	if lang == "" {
+		lang = domain.LangSwedish // queued before the choice existed
+	}
 	planner, planned := w.tr.(Planner)
-	if planned {
+	if lp, ok := w.tr.(LanguagePlanner); ok {
+		plan = append(plan, lp.PlanFor(lang)...)
+	} else if planned {
 		plan = append(plan, planner.Plan()...)
 	} else {
 		plan = append(plan, progress.Planned{Key: "transcribe", Label: "Transcribing"})
@@ -313,7 +326,7 @@ func (w *Worker) Process(ctx context.Context, job Job) {
 	if !planned {
 		tr.Begin("transcribe", 0)
 	}
-	t, err := w.tr.Transcribe(progress.With(jobCtx, tr), wav)
+	t, err := w.tr.Transcribe(domain.WithLanguage(progress.With(jobCtx, tr), lang), wav)
 	if err != nil {
 		log.Error("upload: transcribe", "kind", errkind.Of(err), "elapsed", time.Since(start).Round(time.Second))
 		abort(domain.UploadErrTranscriptionFailed)

internal/uploads/worker_progress_test.go

@@ -213,3 +213,47 @@ func TestWorkerProgress_AStoreFailureLogsItsSQLStateNeverTheValueItQuotes(t *tes
 	assert.Contains(t, out, "upload: store transcript")
 	assert.Contains(t, out, "kind=sql_22P02")
 }
+
+// langPlannedTr plans per language, like the Ensemble: an auto job has no base engine.
+type langPlannedTr struct{ *fakeTranscriber }
+
+func (langPlannedTr) Plan() []progress.Planned { return plannedTr{}.Plan() }
+func (langPlannedTr) PlanFor(l domain.Language) []progress.Planned {
+	if l == domain.LangAuto {
+		return []progress.Planned{{Key: "engine_b", Label: "Transcribing with B"}}
+	}
+	return plannedTr{}.Plan()
+}
+
+func (p langPlannedTr) Transcribe(ctx context.Context, wav string) (domain.Transcription, error) {
+	r := progress.From(ctx)
+	if domain.LanguageFrom(ctx) != domain.LangAuto {
+		r.Begin("engine_a", 0)
+		r.Done("engine_a")
+	}
+	r.Begin("engine_b", 0)
+	r.Done("engine_b")
+	return p.fakeTranscriber.Transcribe(ctx, wav)
+}
+
+func TestWorkerProgress_AJobGetsThePlanOfItsLanguage(t *testing.T) {
+	for name, tt := range map[string]struct {
+		lang domain.Language
+		want []string
+	}{
+		"auto":    {domain.LangAuto, []string{"received:done", "audio:done", "engine_b:done", "save:done"}},
+		"swedish": {domain.LangSwedish, []string{"received:done", "audio:done", "engine_a:done", "engine_b:done", "save:done"}},
+		"no language (queued before the choice existed)": {"", []string{"received:done", "audio:done", "engine_a:done", "engine_b:done", "save:done"}},
+	} {
+		t.Run(name, func(t *testing.T) {
+			r := newWRig(t, time.Minute)
+			w := newProgressWorker(t, r, langPlannedTr{r.tr})
+			job := r.spool(t, "a")
+			job.Language = tt.lang
+
+			w.Process(context.Background(), job)
+
+			assert.Equal(t, tt.want, keysAndStates(r.st.lastSteps()))
+		})
+	}
+}

internal/uploads/worker_test.go

@@ -126,6 +126,7 @@ type fakeTranscriber struct {
 	result domain.Transcription
 	err    error
 	paths  []string
+	langs  []domain.Language // what each call's context carried
 	// block, when non-nil, holds every call until it is closed or ctx ends.
 	block   chan struct{}
 	running atomic.Int32
@@ -134,6 +135,7 @@ type fakeTranscriber struct {
 
 func (f *fakeTranscriber) Transcribe(ctx context.Context, wav string) (domain.Transcription, error) {
 	f.paths = append(f.paths, wav)
+	f.langs = append(f.langs, domain.LanguageFrom(ctx))
 	n := f.running.Add(1)
 	defer f.running.Add(-1)
 	for {
@@ -337,3 +339,24 @@ func (dbErr) Error() string {
 	return `ERROR: invalid input syntax for type json: "zebrakaka secret words"`
 }
 func (dbErr) SQLState() string { return "22P02" }
+
+func TestWorker_TheTranscriberSeesTheLanguageOfTheJobOnItsContext(t *testing.T) {
+	for name, tt := range map[string]struct {
+		job  domain.Language
+		want domain.Language
+	}{
+		"auto":                   {domain.LangAuto, domain.LangAuto},
+		"swedish":                {domain.LangSwedish, domain.LangSwedish},
+		"a job with no language": {"", domain.LangSwedish}, // queued before the field existed
+	} {
+		t.Run(name, func(t *testing.T) {
+			r := newWRig(t, time.Minute)
+			job := r.spool(t, "a")
+			job.Language = tt.job
+
+			r.w.Process(context.Background(), job)
+
+			assert.Equal(t, []domain.Language{tt.want}, r.tr.langs)
+		})
+	}
+}

internal/web/uploads.go

@@ -28,7 +28,7 @@ import (
 // *uploads.Intake satisfies it. It is the whole of what the handlers know about
 // validation, spooling and queueing.
 type Uploader interface {
-	Accept(ctx context.Context, userID, title string, src io.Reader) (id string, err error)
+	Accept(ctx context.Context, userID, title string, lang domain.Language, src io.Reader) (id string, err error)
 }
 
 const (
@@ -36,6 +36,8 @@ const (
 	// and the title field; the cap itself is enforced on the file part by Intake.
 	uploadOverhead = 1 << 20
 	maxTitleRunes  = 200
+	// maxLanguageBytes bounds what is read of the language field; a valid value is at most four bytes, so a longer one fails the parse.
+	maxLanguageBytes = 16
 	// uploadPollEvery is how often an unfinished upload re-asks for its status.
 	uploadPollEvery = "2s"
 	// serviceSilentAfter is how long a job may go without any signal (heartbeat or
@@ -89,6 +91,7 @@ func (a *App) handleUploadPost(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	title := ""
+	lang := domain.LangSwedish
 	for {
 		part, err := mr.NextPart()
 		if errors.Is(err, io.EOF) {
@@ -121,11 +124,29 @@ func (a *App) handleUploadPost(w http.ResponseWriter, r *http.Request) {
 				return
 			}
 			title = cleanTitle(string(b))
+		case "language":
+			// A closed set read before the file: anything else is refused before the file
+			// is spooled, so a crafted value never reaches an engine (tapir#61).
+			b, err := io.ReadAll(io.LimitReader(part, maxLanguageBytes+1))
+			if err != nil {
+				if a.abandoned(w, r) {
+					return
+				}
+				a.renderUploadsPage(w, r, userID, http.StatusBadRequest, "That upload could not be read. Please try again.")
+				return
+			}
+			l, ok := domain.ParseLanguage(string(b))
+			if !ok {
+				a.logger().Info("upload rejected", "reason", "language")
+				a.renderUploadsPage(w, r, userID, http.StatusBadRequest, "Choose a language from the list.")
+				return
+			}
+			lang = l
 		case "file":
 			if title == "" {
 				title = titleFromFilename(part.FileName())
 			}
-			id, err := a.Uploads.Accept(r.Context(), userID, title, part)
+			id, err := a.Uploads.Accept(r.Context(), userID, title, lang, part)
 			if err != nil {
 				a.uploadFailure(w, r, userID, err)
 				return
@@ -300,6 +321,14 @@ func cloudProvider(endpoint string) (string, bool) {
 	return "", false
 }
 
+// languageLabel is how the page names the language a recording was transcribed as.
+func languageLabel(l domain.Language) string {
+	if l == domain.LangAuto {
+		return "Other (detected by the engine)"
+	}
+	return "Swedish"
+}
+
 // hasNote reports whether any phase carries a note. A note is the only warning for a
 // recording that is shorter than its file claimed, so a record that has one is shown open.
 func hasNote(steps []domain.ProgressStep) bool {

internal/web/uploads.templ

@@ -24,6 +24,14 @@ templ UploadsPage(v uploadsView) {
 			}
 			<form method="post" action="/uploads" enctype="multipart/form-data">
 				<p><label>Title (optional) <input type="text" name="title" maxlength="200"/></label></p>
+				<p>
+					<label>Language
+						<select name="language">
+							<option value="sv" selected>Swedish</option>
+							<option value="auto">Other (detected by the engine)</option>
+						</select>
+					</label>
+				</p>
 				<p><input type="file" name="file" accept="audio/*,.m4a,.mp3,.wav,.opus,.ogg,.mp4" required/></p>
 				<p><button type="submit">Upload and transcribe</button></p>
 			</form>
@@ -49,6 +57,7 @@ templ UploadPage(u domain.UploadedTranscript, chatEnabled bool, now time.Time) {
 	@Layout("Tapir — " + u.Title) {
 		<article class="account">
 			<h1>{ u.Title }</h1>
+			<p class="muted">Language: { languageLabel(u.Language) }</p>
 			@uploadStatus(u, chatEnabled, now)
 			<p><a href="/uploads">All recordings</a></p>
 		</article>

internal/web/uploads_disconnect_handler_test.go

@@ -14,6 +14,8 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // A client that hangs up in the middle of an upload is routine, not a server fault. The
@@ -85,7 +87,7 @@ func TestUploadPost_AClientThatHangsUpAnywhereInTheBodyIsLoggedAtInfoAndNeverAsA
 // context is cancelled, then Accept fails the way a read from a dead connection does.
 type goneMidAccept struct{ cancel context.CancelFunc }
 
-func (g goneMidAccept) Accept(context.Context, string, string, io.Reader) (string, error) {
+func (g goneMidAccept) Accept(context.Context, string, string, domain.Language, io.Reader) (string, error) {
 	g.cancel()
 	return "", fmt.Errorf("receive: %w", io.ErrClosedPipe)
 }

internal/web/uploads_handler_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"git.d-ma.be/mathias/tapir/internal/domain"
 	"git.d-ma.be/mathias/tapir/internal/uploads"
 	"git.d-ma.be/mathias/tapir/internal/web"
 )
@@ -132,7 +133,7 @@ func TestUploadPost_AcceptedAudioQueuesARowAndRedirectsToIt(t *testing.T) {
 	assert.Equal(t, "Sprint review", title)
 	assert.Equal(t, "/uploads/"+id, rec.Header().Get("Location"))
 	require.Len(t, sub.jobs, 1)
-	assert.Equal(t, uploads.Job{UserID: userID, UploadID: id, Path: sub.jobs[0].Path, Duration: audioOK.Duration}, sub.jobs[0])
+	assert.Equal(t, uploads.Job{UserID: userID, UploadID: id, Path: sub.jobs[0].Path, Language: domain.LangSwedish, Duration: audioOK.Duration}, sub.jobs[0])
 	spooled, err := os.ReadFile(sub.jobs[0].Path)
 	require.NoError(t, err)
 	assert.Equal(t, "synthetic audio bytes", string(spooled))

internal/web/uploads_language_handler_test.go

@@ -0,0 +1,151 @@
+package web_test
+
+// The language of a recording is chosen on the upload form (tapir#61). These drive the real
+// Router, Intake and Postgres store; the submitter is the process boundary and records the
+// job the worker would receive.
+
+import (
+	"bytes"
+	"context"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
+)
+
+// langReq builds an upload whose parts come in the order given: "title", "language" and
+// "file" (the file part always carries the same synthetic bytes).
+func langReq(t *testing.T, order []string, language string) *http.Request {
+	t.Helper()
+	var buf bytes.Buffer
+	mw := multipart.NewWriter(&buf)
+	for _, part := range order {
+		switch part {
+		case "title":
+			require.NoError(t, mw.WriteField("title", "m"))
+		case "language":
+			require.NoError(t, mw.WriteField("language", language))
+		case "file":
+			fw, err := mw.CreateFormFile("file", "m.wav")
+			require.NoError(t, err)
+			_, err = fw.Write([]byte("RIFF....WAVE"))
+			require.NoError(t, err)
+		}
+	}
+	require.NoError(t, mw.Close())
+	req := httptest.NewRequest(http.MethodPost, "/uploads", &buf)
+	req.Header.Set("Content-Type", mw.FormDataContentType())
+	return req
+}
+
+func rowLanguage(t *testing.T, location string) domain.Language {
+	t.Helper()
+	id := strings.TrimPrefix(location, "/uploads/")
+	got, err := newStore(t).GetUpload(context.Background(), userID, id)
+	require.NoError(t, err)
+	return got.Language
+}
+
+func TestUploadPost_TheLanguageFieldReachesTheJobAndTheRow(t *testing.T) {
+	for _, tt := range []struct {
+		name     string
+		language string
+		want     domain.Language
+	}{
+		{"other", "auto", domain.LangAuto},
+		{"swedish", "sv", domain.LangSwedish},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			app, sub := newUploadApp(t, audioOK, 200<<20)
+
+			rec := do(t, app, langReq(t, []string{"title", "language", "file"}, tt.language))
+
+			require.Equal(t, http.StatusSeeOther, rec.Code)
+			require.Len(t, sub.jobs, 1)
+			assert.Equal(t, tt.want, sub.jobs[0].Language)
+			assert.Equal(t, tt.want, rowLanguage(t, rec.Header().Get("Location")))
+		})
+	}
+}
+
+func TestUploadPost_NoLanguageFieldIsSwedishAsBefore(t *testing.T) {
+	app, sub := newUploadApp(t, audioOK, 200<<20)
+
+	rec := do(t, app, langReq(t, []string{"title", "file"}, ""))
+
+	require.Equal(t, http.StatusSeeOther, rec.Code)
+	require.Len(t, sub.jobs, 1)
+	assert.Equal(t, domain.LangSwedish, sub.jobs[0].Language)
+	assert.Equal(t, domain.LangSwedish, rowLanguage(t, rec.Header().Get("Location")))
+}
+
+// A part after the file is never read (the file part ends the stream), so a client that
+// orders its fields wrongly gets Swedish, the old behaviour, not a guess.
+func TestUploadPost_ALanguageFieldAfterTheFileIsNotReadAndTheUploadIsSwedish(t *testing.T) {
+	app, sub := newUploadApp(t, audioOK, 200<<20)
+
+	rec := do(t, app, langReq(t, []string{"title", "file", "language"}, "auto"))
+
+	require.Equal(t, http.StatusSeeOther, rec.Code)
+	require.Len(t, sub.jobs, 1)
+	assert.Equal(t, domain.LangSwedish, sub.jobs[0].Language)
+}
+
+func TestUploadPost_ALanguageOutsideTheClosedSetIsRefusedBeforeAnythingIsSpooledOrStored(t *testing.T) {
+	for _, bad := range []string{"en", "SV", " sv", "sv,auto", "../auto", strings.Repeat("a", 5000)} {
+		t.Run(bad[:min(len(bad), 12)], func(t *testing.T) {
+			app, sub := newUploadApp(t, audioOK, 200<<20)
+
+			rec := do(t, app, langReq(t, []string{"title", "language", "file"}, bad))
+
+			assert.Equal(t, http.StatusBadRequest, rec.Code)
+			assert.Empty(t, sub.jobs, "a refused post must not enqueue transcription")
+			rows, err := newStore(t).ListUploads(context.Background(), userID)
+			require.NoError(t, err)
+			assert.Empty(t, rows, "and must leave no row")
+			assert.Contains(t, body(t, rec), "Choose a language from the list.")
+		})
+	}
+}
+
+func TestUploadPage_TheFormOffersSwedishPreselectedAndOtherBeforeTheFilePart(t *testing.T) {
+	app, _ := newUploadApp(t, audioOK, 200<<20)
+
+	b := body(t, do(t, app, get("/uploads")))
+
+	sel := strings.Index(b, `name="language"`)
+	file := strings.Index(b, `name="file"`)
+	require.True(t, sel >= 0, "the form has a language field")
+	assert.True(t, sel < file, "the field must come before the file part: the stream ends at the file")
+	assert.Regexp(t, `<option value="sv" selected`, b, "Swedish is preselected: today's behaviour")
+	assert.Contains(t, b, `<option value="auto"`)
+}
+
+func TestUploadPage_NamesTheLanguageInEveryState(t *testing.T) {
+	for _, status := range []string{"queued", "transcribing", "done", "failed"} {
+		for _, tt := range []struct {
+			language domain.Language
+			want     string
+		}{
+			{domain.LangSwedish, "Swedish"},
+			{domain.LangAuto, "Other (detected by the engine)"},
+		} {
+			t.Run(status+"/"+string(tt.language), func(t *testing.T) {
+				app, _ := newUploadApp(t, audioOK, 200<<20)
+				id := seedUpload(t, userID, "m", status, "Synthetic transcript text.")
+				_, err := rawPool(t).Exec(context.Background(), `UPDATE uploaded_transcripts SET language = $2 WHERE id = $1`, id, string(tt.language))
+				require.NoError(t, err)
+
+				b := body(t, do(t, app, get("/uploads/"+id)))
+
+				assert.Contains(t, b, "Language: "+tt.want)
+			})
+		}
+	}
+}

internal/web/uploads_logging_handler_test.go

@@ -13,6 +13,8 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
 )
 
 // Error paths of the upload routes log a kind, never the error's text, which can carry
@@ -37,7 +39,7 @@ func (l *lockedBuf) String() string {
 
 type failingUploader struct{ err error }
 
-func (f failingUploader) Accept(context.Context, string, string, io.Reader) (string, error) {
+func (f failingUploader) Accept(context.Context, string, string, domain.Language, io.Reader) (string, error) {
 	return "", f.err
 }
 

test/acceptance/scenario_coverage_test.go

@@ -123,6 +123,10 @@ var scenarioCoverage = map[string]string{
 	"A long recording is not cut to its first third":                            "TestAnswerMaxCharsOverridesTheServiceCap",
 
 	"A transcript made by the cloud fallback says the audio left the homelab": "TestUploadStatus_ACloudServedTranscriptSaysTheAudioLeftTheHomelab",
+	"I choose the language of a recording":                                    "TestUploadPost_TheLanguageFieldReachesTheJobAndTheRow",
+	"Swedish stays the default":                                               "TestUploadPost_NoLanguageFieldIsSwedishAsBefore",
+	"A language outside the list is refused":                                  "TestUploadPost_ALanguageOutsideTheClosedSetIsRefusedBeforeAnythingIsSpooledOrStored",
+	"A recording in another language never reaches the Swedish-only engine":   "TestEnsemble_AnAutoLanguageUploadNeverReachesTheBaseEngineAndIsNotReconciled",
 
 	"I can delete a finished recording":                        "TestUploadDelete_AnOwnerRemovesAFinishedOrFailedRecordingAndLandsOnTheList",
 	"A recording still being transcribed cannot be deleted":    "TestUploadDelete_ARecordingStillBeingTranscribedIsRefusedWith409AndKept",