Rules you can't move: building the engine, and locking it in the database
A discipline app is only as honest as its lock. How Drawline's rule engine works, why the database refuses to unlock a started challenge, and why the clock counts up.
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Hold the line.
Blog posts for Drawline: a trading discipline platform (RawData)
The boring foundation, and the bug the tests caught first
Accounts, two-factor, and sessions aren't why anyone builds a trading discipline app. Here's why they came first anyway, and the 2FA bug that would have locked everyone out.
ReadDrawing the line before writing a line of code
Why Drawline started as a stack of decisions instead of a repo, and the one change of direction that shaped everything after it.
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