Fix Deepsource issues (#22)

* Fix Deepsource issues

* Add docs/ to Deepsource exclusion list

* Fix black formatting

docs/src/db_sqlalchemy.py

@@ -0,0 +1,37 @@
+import databases
+import sqlalchemy
+from fastapi import FastAPI
+from fastapi_users.db import SQLAlchemyBaseUserTable, SQLAlchemyUserDatabase
+from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
+
+DATABASE_URL = "sqlite:///./test.db"
+
+database = databases.Database(DATABASE_URL)
+
+Base: DeclarativeMeta = declarative_base()
+
+
+class UserTable(Base, SQLAlchemyBaseUserTable):
+    pass
+
+
+engine = sqlalchemy.create_engine(
+    DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+Base.metadata.create_all(engine)
+
+users = UserTable.__table__
+user_db = SQLAlchemyUserDatabase(database, users)
+
+app = FastAPI()
+
+
+@app.on_event("startup")
+async def startup():
+    await database.connect()
+
+
+@app.on_event("shutdown")
+async def shutdown():
+    await database.disconnect()