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POST /api/admin/cover-sources/research bumps cover_art_sources_meta. current_version unconditionally; the next enrichment pass re-eligibles every 'none' row. Existing positively-sourced rows are not affected — the version-mismatch eligibility rule only kicks in for 'none'. Admin Cover Art panel gains a "Re-search missing art" button that calls the endpoint and shows a confirmation toast. Operator's escape hatch when: - They've added a Last.fm key and want to retry failed rows immediately rather than waiting for the next scheduled scan. - An upstream provider's catalog has updated (e.g. Deezer added a back-catalog import). - They want to verify a fix end-to-end before the next scheduled scan fires. SettingsService.BumpVersion (the unconditional version of T5's BumpVersionIfProvidersChanged) is the single-call DB writer; both endpoints route through it. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>