config/db.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from dotenv import load_dotenv
load_dotenv()
import os

##pymysql
##mysql -u root -p users
DB_URL = os.getenv('MYSQL_URI')

engine = create_engine(
    DB_URL,
    pool_pre_ping=True,
    pool_recycle=3600,
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()