Not sure if this matters, but the model doesn't have an autoincrement
primary key:
class ExchangeRate(Base):
currency_from = Column(CURRENCY_ISO_CODE_TYPE, primary_key=True)
currency_to = Column(CURRENCY_ISO_CODE_TYPE, primary_key=True)
...
created_at = Column(DateTime, nullable=False, server_default=func.now())
updated_at = Column(DateTime, nullable=False, server_default=func.now(),
server_onupdate=func.now())
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