feat: improve sqlite database reliability

internal/db/db.go

@@ -35,6 +35,11 @@ func New(dbPath string) (*Database, error) {
 		return nil, err
 	}
 
+	// Configure SQLite for better reliability
+	if err := configureSQLite(db); err != nil {
+		return nil, err
+	}
+
 	// Initialize database
 	if err := initDatabase(db); err != nil {
 		return nil, err
@@ -794,6 +799,32 @@ func initDatabase(db *sql.DB) error {
 	return nil
 }
 
+// Configure SQLite for better reliability
+func configureSQLite(db *sql.DB) error {
+	pragmas := []string{
+		// Enable Write-Ahead Logging for better concurrency and crash recovery
+		"PRAGMA journal_mode = WAL",
+		// Set 5-second timeout when database is locked by another connection
+		"PRAGMA busy_timeout = 5000",
+		// Balance between safety and performance for disk writes
+		"PRAGMA synchronous = NORMAL",
+		// Set large cache size (1GB) for better read performance
+		"PRAGMA cache_size = 1000000000",
+		// Enable foreign key constraint enforcement
+		"PRAGMA foreign_keys = true",
+		// Store temporary tables and indices in memory for speed
+		"PRAGMA temp_store = memory",
+	}
+
+	for _, pragma := range pragmas {
+		if _, err := db.Exec(pragma); err != nil {
+			return fmt.Errorf("failed to execute %s: %w", pragma, err)
+		}
+	}
+
+	return nil
+}
+
 // CacheGet retrieves a value from the cache
 func (d *Database) CacheGet(key string) (string, error) {
 	query := `