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) the embedding phase (multi-query expansion via cpu-only ollama) can take several minutes. nginx's proxy_read_timeout (60s default) was killing the idle sse connection before any event was flushed, leaving the ui stuck on "retrieving context…" forever. send a sse comment (: keepalive) every 20s to keep the connection alive through the entire pipeline duration.
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Merges #434.
RAG chat was stuck on "Retrieving context…" in prod because nginx's
proxy_read_timeout(60s) killed the SSE connection before the first event — the embedding phase takes 3–5 min on CPU-only ollama. Added a 20s SSE comment heartbeat to keep the connection alive.1449 backend + 521 frontend tests pass.