Name "db.Model" is not defined in Mypy but is defined in SQLAlchemy function from flask_sqlalchemy package in VSCode

Bug Report

(A clear and concise description of what the bug is.)

To Reproduce

from flask import Flask, render_template, redirect, url_for
from flask_sqlalchemy import SQLAlchemy
import math

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///users.db"
db = SQLAlchemy(app)


class User(db.Model):

Expected Behavior
No errors because db.Model is in the SQLAlchemy class of flask_sqlalchemy, so the official Python extensions shows (variable) db: SQLAlchemy when I highlight the error squiggle in VSCode.

Actual Behavior
Name "db.Model" is not defined

Your Environment

• Mypy version used: 1.11.2
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.9

Start with the provided Python reproduction using mypy 1.11.2 and Python 3.9, then compare mypy's handling of db.Model with VSCode's inferred SQLAlchemy type. The issue names no mypy source file or test, so the first task is locating the analysis path for flask_sqlalchemy's SQLAlchemy(app) and determining the expected behavior.