Timeline axis is valid_time — when each source says the fact was true in the world, not when Dontopedia learned about it. Retracted rows are kept for provenance; coloured stripes indicate the context kind.
Implement conditional requests using `ETag` or `Last-Modified` headers to serve cached responses when the data hasn't changed.
### 4. **Client-Side Caching**
Encourage client-side caching by setting appropriate cache control headers in you…
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Existing claims and sources remain available while the prepaid research lane recharges.