lot_manager/db/base.py

import os

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
from sqlalchemy.orm import sessionmaker

import json

KB_ROOT_PATH = "/home/pi/"
DB_ROOT_PATH = os.path.join(KB_ROOT_PATH, "lot_data.db")
SQLALCHEMY_DATABASE_URI = f"sqlite:///{DB_ROOT_PATH}"

engine = create_engine(
    SQLALCHEMY_DATABASE_URI,
    json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
)

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

Base: DeclarativeMeta = declarative_base()