perf(preview): bulk process preview regeneration#58229
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♻️ refactor
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This is a WIP [skip ci] Signed-off-by: Anna Larch <anna@nextcloud.com>
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and wrap the queries in transactions
Follow up to nextcloud/previewgenerator#638
The update of previews was doing one query per file. With this PR, the queries are bulk processed and reduce the query numbers considerably.
Summary
TODO
Checklist
3. to review, feature component)stable32)