Keep the lesson for the next incident
Write the total contract
Document the authoritative source for each component, the currency precision, adjustment order, and when recalculation must occur. Include examples for discounts, tax, shipping, and quantity edits. Keep the language precise enough that a future test can assert the same rule.
Keep a regression fixture
Save a redacted cart fixture for the smallest reproducing case and one neighboring case that must remain valid. Note the state transitions needed to trigger the mismatch. Link the fixture to the work record instead of relying on a screenshot that hides inputs.
Define recurrence signals
Choose observations that should reopen review: a divergence between payment and order totals, a failed recalculation, or an unexpected precision change. State the sampling limits and owner. Do not label missing data as a healthy zero or imply complete coverage.
What to carry forward
The durable lesson is a tested calculation contract plus a small fixture that recreates the risky state. Close learning work only after the owner, recurrence condition, and remaining unknowns are recorded so a similar mismatch can be recognized without repeating the original search.
Keep the decision with the work.
Use a Work Item in Aglet to record the problem, the evidence you have, and the next decision. Add an owner and priority, then keep updates in the discussion so the next person can follow the reasoning.
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