5 posts tagged this topic.
A duplicate-customer scan ran right after its own transaction returned, but on the website path that transaction was only a savepoint inside the caller's. A read-only audit, not the 1,319 tests already passing, found that bug and three more like it.
A refactor made a branch entity canonical across tenant workspaces so it could belong to several at once — but the balance queries that filtered on its id kept summing every workspace's top-ups and usage together, so a workspace with no billing connection configured still saw another tenant's budget on its dashboard.
WhatsApp status counts tallied from a vendor's delivery log are exclusive latest-state buckets, not a running total — dividing every rate by raw sentCount produced a 177.8% reply rate and a 2,881% delivered rate in production, and the fix needed no new column, only different arithmetic.
A CRM is only as good as the data flowing into it. The interesting work is rarely the UI — it is the plumbing.
A spreadsheet quietly running part of the business is a production system with real users and a proven spec. You earn the right to replace it by matching its numbers exactly — bugs included — before you change a single thing.