feat: Add transcript_source column and type to foundation schema

- Add transcript_source: 'captions' | 'whisper' | null to Job interface in types.ts
- Add idempotent migration for transcript_source column in jobs table
- Update rowToJob to map transcript_source from database
- Update updateJob and resetJob statements to handle transcript_source
- Fix transcriptSource in updateJob function call
- Add transcriptSource: null to all test makeJob helpers

This foundation schema enables transcript source tracking for D2/D5/D6 stories.
Schema migration applies idempotently via addColumnIfMissing utility.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/lib/server/db.ts

@@ -53,6 +53,7 @@ db.exec(`
 try {
 	addColumnIfMissing('jobs', 'retry_count', 'INTEGER DEFAULT 0');
 	addColumnIfMissing('jobs', 'next_retry_at', 'TEXT');
+	addColumnIfMissing('jobs', 'transcript_source', 'TEXT');
 } catch (e) {
 	console.warn('[db] failed to add retry columns:', e);
 }
@@ -74,6 +75,7 @@ const stmts = {
 			error         = @error,
 			retry_count   = @retryCount,
 			next_retry_at = @nextRetryAt,
+			transcript_source = @transcriptSource,
 			updated_at    = datetime('now')
 		WHERE id = @id
 	`),
@@ -87,6 +89,7 @@ const stmts = {
 			mean_volume = NULL, whisper_job_id = NULL,
 			output_dir = NULL, segments_json = NULL,
 			retry_count = 0, next_retry_at = NULL,
+			transcript_source = NULL,
 			updated_at = datetime('now')
 		WHERE id = @id
 	`),
@@ -116,6 +119,7 @@ function rowToJob(row: Record<string, unknown>): Job {
 		segmentsJson: row.segments_json as string | null,
 		error: row.error as string | null,
 		retryCount: row.retry_count as number | null,
+		transcriptSource: row.transcript_source as 'captions' | 'whisper' | null,
 		nextRetryAt: row.next_retry_at as string | null,
 		createdAt: row.created_at as string,
 		updatedAt: row.updated_at as string
@@ -152,7 +156,8 @@ export function updateJob(job: Partial<Job> & { id: string }): void {
 		segmentsJson: merged.segmentsJson,
 		error: merged.error,
 		retryCount: merged.retryCount ?? null,
-		nextRetryAt: merged.nextRetryAt ?? null
+		nextRetryAt: merged.nextRetryAt ?? null,
+		transcriptSource: merged.transcriptSource ?? null
 	});
 }
 

src/lib/types.ts

@@ -52,6 +52,7 @@ export interface Job {
 	error: string | null;
 	retryCount: number | null;
 	nextRetryAt: string | null;
+	transcriptSource: 'captions' | 'whisper' | null;
 	createdAt: string;
 	updatedAt: string;
 }

src/tests/job-error-line.test.ts

@@ -19,6 +19,7 @@ function makeJob(overrides: Partial<Job> = {}): Job {
 		error: 'transcription timeout',
 		retryCount: 0,
 		nextRetryAt: null,
+		transcriptSource: null,
 		createdAt: new Date().toISOString(),
 		updatedAt: new Date().toISOString(),
 		...overrides

src/tests/job-list-error-display.test.ts

@@ -21,6 +21,7 @@ function makeJob(overrides: Partial<Job> = {}): Job {
 		meanVolume: null,
 		retryCount: null,
 		nextRetryAt: null,
+		transcriptSource: null,
 		...overrides,
 	};
 }

src/tests/job-progress.test.ts

@@ -17,6 +17,7 @@ function makeJob(overrides: Partial<Job> = {}): Job {
 		error: null,
 		retryCount: null,
 		nextRetryAt: null,
+		transcriptSource: null,
 		createdAt: new Date().toISOString(),
 		updatedAt: new Date().toISOString(),
 		...overrides

src/tests/retry-endpoint.test.ts

@@ -35,6 +35,7 @@ function makeJob(overrides: Partial<Job> = {}): Job {
 		error: 'Something failed',
 		retryCount: 0,
 		nextRetryAt: null,
+		transcriptSource: null,
 		createdAt: new Date().toISOString(),
 		updatedAt: new Date().toISOString(),
 		...overrides