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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