Engineer Builds Email-Driven Trading Journal That Flags Ambiguous Broker Events

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A developer describes an early-access system that reads broker-confirmation emails to automatically update a trading journal. Rather than simply extracting ticker and price fields, the system uses a state machine to handle complex events like partial closes, rolls, assignments, and duplicate notifications. Uncertain events are routed to a human review queue instead of being guessed at. The author explains the architecture and the failures that shaped it, using read-only Gmail access to avoid collecting broker credentials. The piece is presented as an engineering account, not investment advice or a performance claim.

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