Fix SQLAlchemy-related type errors

from .db_config import get_database_uri, get_uri_for_sqlite

db = SQLAlchemy()

db: SQLAlchemy = SQLAlchemy()

from .model import *

from flask import Flask

from typing import Any

from portal import db

BaseModel: Any = db.Model

class FlaskConfigEntry(db.Model):

class FlaskConfigEntry(BaseModel):

    """

    A configuration entry for Flask (a key-value pair) as persisted in a database

    """

from abc import abstractmethod

from typing import Any, List, Optional, Self

from sqlalchemy import Column

from flask import g

from portal import db

BaseModel: Any = db.Model

class Retrievable(db.Model):

class Retrievable(BaseModel):

    """

    A type whose instances can be retrieved from the database.

    __abstract__ = True

    @classmethod

    def get_canonical_order_column(cls) -> Optional[db.Column]:

    def get_canonical_order_column(cls) -> Optional[Column]:

        """

        Return the colum by which instances of this type should be canonically ordered

        when retrieving them all from the database.