fix(stats): preserve manual episode assignments across reparsing

launcher/sync/engine-merge.test.ts

@@ -80,6 +80,11 @@ test('merges remote-only sessions with catalog, lifetime, and rollups', () => {
         { headword: '食べる', word: '食べた', reading: 'たべた', count: 1 },
       ],
     });
+    withWritableDb(remotePath, (db) => {
+      db.prepare(
+        `UPDATE imm_videos SET anime_assignment_locked = 1 WHERE video_key = 'showb-e1'`,
+      ).run();
+    });
 
     const summary = mergeSnapshotIntoDb(localPath, remotePath);
     assert.equal(summary.sessionsMerged, 1);
@@ -126,6 +131,14 @@ test('merges remote-only sessions with catalog, lifetime, and rollups', () => {
         `SELECT video_id FROM imm_videos WHERE video_key = 'showb-e1'`,
       )?.video_id,
     );
+    assert.equal(
+      queryOne<{ locked: number }>(
+        localPath,
+        'SELECT anime_assignment_locked AS locked FROM imm_videos WHERE video_id = ?',
+        [mergedVideoId],
+      )?.locked,
+      1,
+    );
     assert.equal(
       count(localPath, 'SELECT COUNT(*) AS n FROM imm_daily_rollups WHERE video_id = ?', [
         mergedVideoId,

launcher/test-support/immersion-db-schema.ts

@@ -1,4 +1,4 @@
-// Schema-version-18 shape of the tables the sync merge touches (plus the
+// Current schema shape of the tables the sync merge touches (plus the
 // app's indexes), mirroring ensureSchema / ensureLifetimeSummaryTables /
 // ensureStatsExcludedWordsTable in src/core/services/immersion-tracker/storage.ts.
 export const IMMERSION_DB_FIXTURE_DDL = `
@@ -39,6 +39,7 @@ export const IMMERSION_DB_FIXTURE_DDL = `
     parser_source TEXT,
     parser_confidence REAL,
     parse_metadata_json TEXT,
+    anime_assignment_locked INTEGER NOT NULL DEFAULT 0 CHECK(anime_assignment_locked IN (0, 1)),
     watched INTEGER NOT NULL DEFAULT 0,
     duration_ms INTEGER NOT NULL CHECK(duration_ms>=0),
     file_size_bytes INTEGER CHECK(file_size_bytes>=0),