Building an automated regression test suite for LLM memory storage with Pytest and Docker

Short summary

A practical post-mortem on a production incident where a Redis-to-PostgreSQL+pgvector migration broke LLM memory recall due to an unbuilt vector index. The author built an automated regression test suite using Pytest and Docker testcontainers that spins up clean storage instances, replays historical data, and asserts correct vector similarity recall. Includes concrete code examples and discusses pitfalls in testing vector storage systems.

• •Production incident caused by incomplete vector index during storage migration
• •Pytest + Docker testcontainers provide isolated, disposable test databases for regression testing
• •Suite replays historical memories and asserts correct recall IDs, scores, and ordering

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