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You add semantic search to a production TypeScript monorepo, so your integration tests need CREATE EXTENSION vector. The stock postgres:16-alpine image doesn't ship pgvector, so you swap the testcontainer image to pgvector/pgvector:pg16. Tests that have nothing to do with vectors start failing. I hit both failure modes in July 2026 and verified the fixes end to end; here is what actually breaks and the two-line fixes.

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