Langchain-Chatchat

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from sqlalchemy import create_engine
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from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
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from sqlalchemy.orm import sessionmaker
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from configs import SQLALCHEMY_DATABASE_URI
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import json
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engine = create_engine(
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    SQLALCHEMY_DATABASE_URI,
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    json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
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)
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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Base: DeclarativeMeta = declarative_base()
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