Feat/acronym search 02 redis cache - #5
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Adds Alembic with a no-op baseline revision for the pre-existing unmanaged translations table, plus a migration that creates acronym_mapping (id PK, expansions as JSONB array, description, composite index on acronym+is_active) and seeds it from data/acronyms.csv, now the real 599-acronym dataset.
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get_expansion() checks Redis first, falls back to Postgres on miss, writes through to cache; warm_cache() pre-populates every active acronym at startup. Redis pieces (cache_client.py, redis_client.py) stay acronym-agnostic; only acronym_service.py knows about acronyms, JSON-encoding the expansions array for the string-only cache layer.
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get_expansion() only handled a cache miss (Redis says "not found"), not a cache error (Redis unreachable/timing out) — the latter raised straight out of the function before Postgres was ever tried, so a Redis outage broke every acronym-detected search instead of just degrading it. Now both the cache read and the write-through are guarded: any Redis error logs a warning and falls back to Postgres, matching the fallback behavior main.py's startup path already assumes exists.
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