Fix type check errors

src/traffcap/repositories/rule_repository.py

@@ -44,7 +44,7 @@ async def create_rule(cls, rule: str = ".*") -> Optional[Rule]:
     @classmethod
     async def delete_rule_by_id(cls, rule_id: int) -> None:
         async with cls.session() as session:
-            session.delete(
+            await session.delete(
                 await session.get(RuleModel, rule_id)
             )
             await session.commit()

src/traffcap/server.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 from pathlib import Path
+from typing import Dict, Any
 import click
 import logging
 from traffcap.core import (
@@ -28,7 +29,7 @@
 app = FastAPI()
 
 
-def custom_openapi():
+def custom_openapi() -> Dict[str, Any]:
     if app.openapi_schema:
         return app.openapi_schema
 
@@ -44,7 +45,7 @@ def custom_openapi():
 
     return app.openapi_schema
 
-app.openapi = custom_openapi
+setattr(app, 'openapi', custom_openapi)
 
 
 # Enable CORS from anywhere with anything