async fn rehash_fingerprints(pool: &SqlitePool) -> Result<(), Error>Expand description
Re-fingerprints every book in all libraries using BLAKE3 content hashing.
The old fingerprint was derived from file metadata (mtime + size relative to the FAT32 epoch), which was unstable across timestamp changes. This migration computes a new content-based fingerprint for each file that is still present on disk and re-keys all associated database rows (reading states, thumbnails, TOC entries, authors, categories) to the new fingerprint, preserving user progress data.
Files that are no longer present on disk keep a canonicalized legacy
fingerprint in the database so their data remains readable until the next
import() scan removes them as orphans.
Migration ID: v2_rehash_fingerprints
To re-run this migration, delete its tracking row:
DELETE FROM _cadmus_migrations WHERE id = 'v2_rehash_fingerprints';