task: add send common mail task

config/database.py

@@ -0,0 +1,18 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, scoped_session
+from config.settings import settings
+
+SQLALCHEMY_SYNC_URL = (
+    f"postgresql+psycopg://{settings.DB_USER}:{settings.DB_PASS}"
+    f"@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
+)
+
+engine = create_engine(
+    SQLALCHEMY_SYNC_URL,
+    echo=False,       # 开发可改 True
+    future=True
+)
+
+SessionLocal = scoped_session(
+    sessionmaker(bind=engine, autoflush=False, autocommit=False)
+)