feat(sqlite): use busy_timeout pragma to prevent database locking errors

internal/config/database.go

@@ -15,6 +15,6 @@ type DatabaseConfig struct {
 func NewDefaultDatabaseConfig() DatabaseConfig {
 	return DatabaseConfig{
 		Driver: "sqlite",
-		DSN:    "sqlite://emissary.sqlite?_pragma=foreign_keys(1)&_pragma=journal_mode(WAL)&_txlock=immediate",
+		DSN:    "sqlite://emissary.sqlite?_pragma=foreign_keys(1)&_pragma=busy_timeout=60000",
 	}
 }