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Maurice
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Migrations only go forward, and since #2610 an older image refuses a database a newer one migrated. Going back after a bad update therefore needs a copy from before it, and the only copies were backups the admin takes by hand or auto-backup, which is off by default. The first boot on 4.4 migrates every 4.3.x install through the legacy baseline and the new migrations without either. Before applying pending migrations to a file database that holds anything, the boot now writes a VACUUM INTO copy next to it, named pre-migrate-<schema>-<time>.db (legacy-<schema_version> for an install the positional runner left, otherwise the last recorded migration), and keeps the newest TREK_DB_PRE_MIGRATE_SNAPSHOT_KEEP (3). The copy is written under a temporary name and renamed, so a crash never leaves a truncated file that looks good. If it cannot be written the boot refuses before anything is migrated; TREK_DB_PRE_MIGRATE_SNAPSHOT=false is the documented way past that. The newer-database refusal names the copy taken right before the newer release migrated past this one. A fresh install, a restart with nothing pending, an in-memory database and a restore's re-bootstrap (the archive is the copy) take none, and NODE_ENV=test leaves it off unless a suite sets the switch.