perf(database): run PRAGMA optimize before closing connections

SQLite's recommended approach for keeping query plans current: cheap when
nothing needs analyzing, runs incremental ANALYZE on tables/indexes that
have grown significantly since the last run. Wrapped in try/catch since
optimize is advisory and must never block connection close.

Applied to both the main connection and the EPG worker connection.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Entire-Checkpoint: 3d6901072049

apps/electron-backend/src/app/workers/database.worker-connection.ts

@@ -100,6 +100,12 @@ export function closeWorkerDatabase(): void {
         return;
     }
 
+    try {
+        sqlite.pragma('optimize');
+    } catch {
+        // Optimize is advisory; never block close on it.
+    }
+
     sqlite.close();
 
     if (isSqlTraceEnabled()) {

libs/shared/database/src/lib/connection.ts

@@ -573,6 +573,12 @@ export async function getReadOnlyDatabase(): Promise<DatabaseInstance> {
  */
 export function closeDatabase(): void {
     if (sqlite) {
+        try {
+            sqlite.pragma('optimize');
+        } catch {
+            // Optimize is advisory; never block close on it.
+        }
+
         sqlite.close();
 
         if (isSqlTraceEnabled()) {