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5 Open-Source Stacks for Building AI Applications: LlamaIndex+Qdrant to DSPy+SQLite, Debug by Failure Mode

Choosing an open-source stack stopped being optional the moment a local Qdrant + LlamaIndex setup stalled on first retrieval. When you're building AI applications, every cold-start second compounds across users. Two failure modes keep showing up. Poor chunking splits context so no single chunk can…
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