HelixObs / gateway / 26199571472

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fix(api): return 503 within 8s when DB pool is saturated

Adds a context deadline to the monitor bins query so the endpoint fails
fast with 503 instead of hanging until the client disconnects (30s).
Also adds migration 009 with a composite index on
(instrument_id, created_at DESC) to speed up the /monitor/bins query.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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