feat: Probably functional

app/db.py

@@ -1,9 +1,11 @@
+from pathlib import Path
+
 from flask import Flask
 from sqlalchemy import create_engine
-from sqlalchemy.orm import DeclarativeBase, scoped_session, sessionmaker
+from sqlalchemy.orm import DeclarativeBase, Session, scoped_session, sessionmaker
 
 engine = None
-SessionLocal = None
+SessionLocal: scoped_session[Session]
 
 
 class Base(DeclarativeBase):
@@ -13,8 +15,13 @@ class Base(DeclarativeBase):
 def init_db(app: Flask) -> None:  # noqa: ARG001
     global engine, SessionLocal  # noqa: PLW0603
 
+    Path("./instance").mkdir(exist_ok=True)
+
     engine = create_engine("sqlite:///instance/app.db", echo=True, future=True)
-    SessionLocal = scoped_session(sessionmaker(bind=engine))
+    session_local = scoped_session(sessionmaker(bind=engine))
+    if session_local is None:
+        raise RuntimeError
+    SessionLocal = session_local
 
     from . import models  # noqa: F401, PLC0415