fix(stats): accept legacy lexical rollup state schemas

changes/stats-vocabulary-summary-totals.md

@@ -2,7 +2,7 @@ type: fixed
 area: stats
 
 - Fixed Vocabulary totals and charts counting only the first browsing page instead of all tracked vocabulary, without delaying the rest of the page.
-- New-word history now uses permanent daily lexical rollups that apply the same vocabulary filters as the totals and normalize legacy second/millisecond timestamps; versioned background rebuilds repair existing history without dropping playback writes or clearing watch-time, activity, efficiency, and library charts.
+- New-word history now uses permanent daily lexical rollups that apply the same vocabulary filters as the totals and normalize legacy second/millisecond timestamps; versioned background rebuilds repair existing history across legacy rollup-state schemas without dropping playback writes or clearing watch-time, activity, efficiency, and library charts.
 - Calendar-day chart labels now preserve the recorded local date in time zones west of UTC.
 - Vocabulary summary cards and charts refresh automatically after the word exclusion list changes, and failed or unfinished loads use bounded retries before showing an inline error with a Retry control.
 - Rapid exclusion edits no longer race each other; writes are sent in order so a slower earlier save cannot overwrite a newer list.

src/core/services/immersion-tracker/lexical-rollups.test.ts

@@ -257,6 +257,27 @@ test('legacy lexical rollup readiness does not satisfy the current rollup versio
   }
 });
 
+test('current lexical rollup readiness accepts legacy integer state storage', () => {
+  const dbPath = makeDbPath();
+  const db = new Database(dbPath);
+
+  try {
+    db.exec(`
+      CREATE TABLE imm_rollup_state(
+        state_key TEXT PRIMARY KEY,
+        state_value INTEGER NOT NULL
+      );
+      INSERT INTO imm_rollup_state(state_key, state_value)
+      VALUES ('lexical_daily_rollups_version', 2);
+    `);
+
+    assert.equal(areLexicalDailyRollupsReady(db), true);
+  } finally {
+    db.close();
+    fs.rmSync(path.dirname(dbPath), { recursive: true, force: true });
+  }
+});
+
 test('imm_words persists vocabulary visibility for rollup maintenance', () => {
   const dbPath = makeDbPath();
   const db = new Database(dbPath);

src/core/services/immersion-tracker/lexical-rollups.ts

@@ -140,8 +140,11 @@ export function ensureLexicalDailyRollupTables(db: DatabaseSync): void {
 export function areLexicalDailyRollupsReady(db: DatabaseSync): boolean {
   const row = db
     .prepare(`SELECT state_value AS value FROM imm_rollup_state WHERE state_key = ?`)
-    .get(LEXICAL_DAILY_ROLLUP_VERSION_KEY) as { value: string } | null;
-  return row?.value === LEXICAL_DAILY_ROLLUP_VERSION;
+    .get(LEXICAL_DAILY_ROLLUP_VERSION_KEY) as { value: string | number } | undefined;
+  // Older databases created this column with INTEGER affinity, while current
+  // databases use TEXT. SQLite returns the same persisted version with a
+  // different JS type depending on that legacy schema.
+  return row !== undefined && String(row.value) === LEXICAL_DAILY_ROLLUP_VERSION;
 }
 
 export function markLexicalDailyRollupsReady(db: DatabaseSync): void {