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()