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* ✨ Migrate legacy file payloads to file_data and delete orphans Copy file.data and labelled file_change.data to file_data on boot (type main/snapshot, backend db, deleted_at preserved), then delete file_change rows with data but no label, which no read path reaches. Large instances pre-migrate with batched statements and fake this step. Closes #12784. AI-assisted-by: muse-spark-1.3-contributor * 📚 Add 2.19.0 operations runbook for legacy file_data migration Manual pre-migration procedure for big instances, same statements as migration 0157 in batched transactions, following the convention of the file-change partition runbook. Closes #12784. AI-assisted-by: muse-spark-1.3-contributor * 🐛 Address review feedback on the legacy file data migration Fix the issues raised in the review of the migration that moves the legacy file payloads to file_data. The migration deletes the unlabelled file_change rows that carry data, but restore-files still cleared their date, and the retention test asserted they came back. A row without a date never reaches objects-gc, which is the leak fixed in #12419. Restore now unmarks only snapshots, the rows that carry a label, and the retention test checks that the legacy payload keeps its date instead of coming back. Cover the conflict path that had no test: a pre-existing snapshot that collides with a labelled change row, and a second run that must leave the legacy columns null and the orphan row absent. The runbook analyses file_data after the inserts, so the planner does not wait for autovacuum. Drop app.srepl.procs.fdata-storage: the copy it performed is what the migration replaces and nothing requires it. Closes #12784 AI-assisted-by: deepseek-v4.1-flash