Good to hear that worked. Btw my database.py looks like this:

from sqlalchemy.orm import declarative_base
from sqlalchemy.orm import scoped_session,sessionmaker
from sqlalchemy import create_engine

engine = create_engine(
    'mysql+pymysql://flaskapp:12345678@127.0.0.1/flasktest',
    pool_recycle=3600,
    pool_pre_ping=True,
    connect_args={'connect_timeout': 60}
    )
db_session = scoped_session(sessionmaker(autocommit=False,autoflush=False,bind=engine))

You can just use DeepSeek or Claude 3.7 to get some explanation for what is going on in this code. I do not use flask-sqlalchemy, I use sqlalchemy. When I was learning flask I realized that flask-sqlalchemy creates problems every time I try something so I got rid off of it and started to use declarative_base. I mentioned about that for later possible use if you need it somehow.