feat: TTL cache — interval-aware in-memory response caching#7
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- cache.py: get/set/clear/size, TTL from 30s (1m) to 86400s (1w) - registry.fetch() checks cache before providers, populates on success - OHLCV_CACHE_ENABLED=false to disable process-wide - 26 tests: TTL expiry, eviction, env toggle, registry integration - README updated with Caching section and TTL table
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Adds
ohlcv_router.cache— a lightweight in-memory TTL cache for provider responses.What's new:
cache.py:get(),set(),clear(),size(),ttl_for(),is_enabled()1m) → 120s (5m) → 1800s (1h) → 7200s (4h) → 14400s (1d) → 86400s (1w)registry.fetch()checks cache before hitting providers; populates on first successOHLCV_CACHE_ENABLED=falsedisables cache process-wide — useful for scripts that always need fresh data238 total tests passing. ruff clean.