Создана файловая система, main.py и заготовки для создания БД

data/__all_models.py

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+# from . import user

data/db_session.py

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+import sqlalchemy as sa
+import sqlalchemy.orm as orm
+from sqlalchemy.orm import Session
+import sqlalchemy.ext.declarative as dec
+
+SqlAlchemyBase = dec.declarative_base()
+
+__factory = None
+
+def global_init(db_file):
+    global __factory
+
+    if __factory:
+        return
+
+    if not db_file or not db_file.strip():
+        raise Exception("Необходимо указать файл базы данных.")
+
+    conn_str = f'sqlite:///{db_file.strip()}?check_same_thread=False'
+
+    engine = sa.create_engine(conn_str, echo=False)
+    __factory = orm.sessionmaker(bind=engine)
+
+    from . import __all_models
+
+    SqlAlchemyBase.metadata.create_all(engine)
+
+def create_session() -> Session:
+    global __factory
+    return __factory()

main.py

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+from flask import Flask
+from waitress import serve
+from data import db_session
+
+app = Flask(__name__)
+app.config['SECRET_KEY'] = 'test_secret_key'
+
+
+@app.route('/')
+def base():
+    return ''
+
+
+def main():
+    db_session.global_init("db/conventus.db")
+    serve(app, host='0.0.0.0', port=5000)
+
+
+if __name__ == '__main__':
+    main()