Build the Negative-Result Ledger
Create a debug ledger that records hypotheses, tests, negative results, and implications.
The customer profile page shows a stale plan name. AI keeps suggesting Redis TTL fixes even after cache checks look normal. Negative-result ledger: hypothesis, test, result, implication, next action The common trap is recording attempts as a diary: "checked Redis, no issue." That note is too weak. The assistant needs to know what the result rules out and where the investigation should move. Hypothesis H1: Redis serves stale profile data after plan change. The hypothesis is specific enough to test and narrow enough to be ruled out. Test Compare Redis value, database row, and API response for account 482 immediately…
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