LLM Memory System Pitfalls: A 3-Hour Bug Hunt Solved with Pytest Snapshot Testing

It was 2 a.m. when the alert call jolted me awake — our production Agent had suffered “amnesia” for three consecutive conversations. The context the user had carefully built was gone, and complaints were flooding in. Squinting at the logs, I discovered that the rollback method in the memory management module had been broken by an innocuous-looking code refactor. Not only did the rollback undo the erroneous operation, it also wiped out the entire conversation history. Worse still, our existing un...