This change adds a --database-string option to the quickstart and init_env commands so users can supply their own PostgreSQL connection string and bypass the Docker setup, automatically persisting it in the .env file. It makes the project more flexible for environments without Docker or with existing database infrastructure while preserving the original flow for default setups. A possible concern is that unvalidated connection strings or accidental overrides of existing .env values could lead to silent misconfigurations and obscure runtime errors.