action: manual
reason: Database schema migration with backup required. Admin must ensure backup is taken before upgrade and monitor migration completion.
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paperless-ngx 2.21.0

Breaking changes
- Database schema updated. Automatic migrations run on first startup but admin must take full backup before upgrading and verify migration completes without errors.
- Configuration option PAPERLESS_OCR_LANGUAGE default changed from 'eng' to 'auto'. Existing documents may need re-OCR if language detection is important.
- Removed deprecated API endpoints. Third-party integrations using old API endpoints will break.

Features
- New workflow actions
- Improved OCR engine
- Better full-text search