首次完成数据库登录，注册验证。首次完成，migrate_manager.py迁移多个数据库

app/model/Card.py

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+from model.db import db
+from sqlalchemy.orm import mapped_column
+
+class Card(db.Model):
+    __tablename__ = 'card'
+    id = mapped_column(db.Integer, primary_key=True)

app/model/User.py

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+from model.db import db
+from sqlalchemy.orm import mapped_column
+
+class User(db.Model):
+    __tablename__ = 'user'
+    id = mapped_column(db.Integer, primary_key=True,autoincrement=True)
+    username = mapped_column(db.String(80), unique=True, nullable=False)
+    email = mapped_column(db.String(120), unique=True, nullable=True)
+    password = mapped_column(db.String(200), unique=True, nullable=False)

app/model/__init__.py

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+from model.db import db
+from model.User import User
+from model.Card import Card
+
+
+__all__ = ['db','User','Card']

app/model/db.py

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+from sqlalchemy.orm import DeclarativeBase
+from flask_sqlalchemy import SQLAlchemy
+from sqlalchemy import MetaData
+class DataBase(DeclarativeBase):
+    meta = MetaData(naming_convention={
+        "ix": "ix_%(column_0_label)s",
+        "uq": "uq_%(table_name)s_%(column_0_name)s",
+        "ck": "ck_%(table_name)s_%(column_0_name)s",
+        "fk": "fk_%(table_name)s_%(column_0_name)s",
+        "pk": "pk_%(table_name)s"
+    })
+
+db = SQLAlchemy()