fix(db): clear prepared statements on backup restore

src/lib/db/apiKeys.ts

@@ -350,6 +350,22 @@ export async function isModelAllowedForKey(key, modelId) {
   return allowed;
 }
 
+/**
+ * Clear prepared statements cache (called on database reset/restore)
+ * Prepared statements are bound to a specific database connection,
+ * so they must be cleared when the connection is reset.
+ */
+function clearPreparedStatementCache() {
+  _stmtGetAllKeys = null;
+  _stmtGetKeyById = null;
+  _stmtValidateKey = null;
+  _stmtGetKeyMetadata = null;
+  _stmtInsertKey = null;
+  _stmtUpdatePermissions = null;
+  _stmtDeleteKey = null;
+  _schemaChecked = false; // Also reset schema check for new connection
+}
+
 /**
  * Clear all caches (exported for testing/debugging)
  */
@@ -358,3 +374,12 @@ export function clearApiKeyCaches() {
   _modelPermissionCache.clear();
   _regexCache.clear();
 }
+
+/**
+ * Reset all cached state for database connection reset/restore.
+ * Called by backup.ts when the database is restored.
+ */
+export function resetApiKeyState() {
+  clearPreparedStatementCache();
+  clearApiKeyCaches();
+}

src/lib/db/backup.ts

@@ -14,6 +14,7 @@ import {
   DB_BACKUPS_DIR,
   DATA_DIR,
 } from "./core";
+import { resetApiKeyState } from "./apiKeys";
 
 // ──────────────── Backup Config ────────────────
 
@@ -181,6 +182,9 @@ export async function restoreDbBackup(backupId) {
   // Close and reset current connection
   resetDbInstance();
 
+  // Clear all cached prepared statements and other state bound to the old connection
+  resetApiKeyState();
+
   // Remove main file and WAL sidecars to avoid stale frame replay after restore.
   const sqliteFilesToReplace = [
     SQLITE_FILE,

src/lib/localDb.ts

@@ -62,6 +62,8 @@ export {
   getApiKeyMetadata,
   updateApiKeyPermissions,
   isModelAllowedForKey,
+  clearApiKeyCaches,
+  resetApiKeyState,
 } from "./db/apiKeys";
 
 export {