connections.isDefault was maintained by three write paths (upsert preservation, remove-promotion, setDefault) that no production code ever read back; api_cache.cached_at was documented 'optional future use' and written on every cache store. Both columns are dropped in a v21 migration with row-preservation coverage; the dead write machinery, recordAuthSuccess, updateSyncRuleLastExecuted, getDownloadOwnerCount, and OfflineActionType.fromId (rejection semantics live in the sync service's explicit switch) go with them.
Recovery-image compatibility: committed tvOS snapshots written by older builds still carry isDefault in connections rows, and the restore decoder deliberately rejects rows that do not round-trip exactly. A retired-columns allowlist now strips such keys before the strict check, so pre-retirement images stay restorable — the legacy-plaintext restore test caught this and now pins it. _bindServerStatusListener in main.dart also loses its unused provider param and resolver indirection.
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