feat: persist media preview backfill failures#4197
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Add Realm-backed APIs to track and clear media preview backfill failures, and bump the database schema to version 413. Signed-off-by: Marino Faggiana <marino.faggiana@nextcloud.com>
marinofaggiana
marked this pull request as draft
July 21, 2026 06:37
Extract metadata backfill, placeholder hydration, and preview backfill into dedicated processors and organize processing and refresh sources. Signed-off-by: Marino Faggiana <marino.faggiana@nextcloud.com>
Select a limited batch of missing previews inside the processor and skip previously failed items. Simplify failure tracking and clear it when no previews remain or an account is removed. Signed-off-by: Marino Faggiana <marino.faggiana@nextcloud.com>
Add dedicated logging for media preview backfill progress and completion. Signed-off-by: Marino Faggiana <marino.faggiana@nextcloud.com>
marinofaggiana
marked this pull request as ready for review
July 21, 2026 08:00
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Summary
This PR introduces a new background media preview backfill processor that automatically generates missing previews for media files during background processing.
Changes
Background processing flow
The background processing pipeline now performs the following steps:
This keeps media metadata synchronized first, then hydrates missing placeholders, and finally generates previews only for media that still require them.
🤖 AI (if applicable)