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923e13565f
Signing in wrote `usesAccountLogin`, which syncs through key-value storage independently of the account records. A device receiving that flag before the account synthesized a migrated account for a login that was never legacy — and the marker arriving later deliberately retracts nothing, so the credential-less duplicate was permanent and uploaded. The flag is pre-revamp state that migration only reads; accounts describe logins now. `needsCredentials` reads the account list for any instance that has one, so the badge it drives is unaffected. A tombstone now dominates contexts as well as accounts: an offline device can select an account another device deleted and publish that choice with a newer timestamp, which would have left every device pointing at an account that is never coming back. Cached private feeds survived an Apple-account switch two ways. A scope this device has seen before resolves while `CredentialIdentityScope` is still being constructed, so the change notification fires before any observer exists — startup now compares the persisted cache owner. And a purge asked for before the disk cache is read was undone by the load, which now carries it. The need to re-bootstrap after dropping records for want of a resolved identity is persisted. The engine may already have moved its token past those records, so a launch that lost the in-memory flag would neither replay nor bootstrap them.