📝 Update internal README and referred files (#613)

src/backend/app/db/init_db.py

@@ -12,8 +12,13 @@ from app.models import User, UserCreate  # noqa: F401
 def init_db(session: Session) -> None:
     # Tables should be created with Alembic migrations
     # But if you don't want to use migrations, create
-    # the tables un-commenting the next line
-    # Base.metadata.create_all(bind=engine)
+    # the tables un-commenting the next lines
+    # from sqlmodel import SQLModel
+
+    # from app.db.engine import engine
+    # This works because the models are already imported and registered from app.models
+    # SQLModel.metadata.create_all(engine)
+
     user = session.exec(
         select(User).where(User.email == settings.FIRST_SUPERUSER)
     ).first()