better cache
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## MODIFIED Requirements
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### Requirement: Refresh and caching
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The system MUST cache the latest successful ingestion output and MUST serve the cached data to the site renderer.
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The system MUST support periodic refresh on a schedule (at minimum daily) and MUST support a manual refresh trigger.
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On ingestion failure, the system MUST continue serving the most recent cached data.
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The ingestion pipeline MUST use the cache layer (when configured and reachable) to reduce repeated network and parsing work for external sources (for example, YouTube API/RSS and podcast RSS).
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#### Scenario: Scheduled refresh fails
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- **WHEN** a scheduled refresh run fails to fetch one or more sources
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- **THEN** the site continues to use the most recent successfully cached dataset
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#### Scenario: Manual refresh requested
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- **WHEN** a manual refresh is triggered
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- **THEN** the system attempts ingestion immediately and updates the cache if ingestion succeeds
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#### Scenario: Cache hit avoids refetch
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- **WHEN** a refresh run is executed within the cache TTL for a given source+parameters
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- **THEN** the ingestion pipeline uses cached data for that source instead of refetching over the network
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