Add postgresql database support (#475)

* feat: add postgresql db supports

* change: change mysql conn str create way

* fix: Modify the default alembic migration file to meet multi-database support

* Update settings and lint

* update models

* Simplify database config

* Simplify the get db method

* Update create db url

* Updated model type adaptation

* Update sql scripts

* Fix models type

* Adaptation to postgresql code generation

* Update README.md

* Fix alembic file template

* Update docker scripts

backend/scripts/init_data.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # ruff: noqa: I001
+from backend.database.db import create_table
 import logging
 import sys
 
@@ -8,7 +9,6 @@ from anyio import run
 
 sys.path.append('../')
 
-from backend.database.db_mysql import create_table
 
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)