Synthetic source created by historical preview commit 6eaab59c972fedd10744f65cd7dfa530dc5f1f91 using its original migration runner.
Project and two idle threads created through HTTP and WebSocket APIs. No live user data copied; no migration history edited.

Source SHA-256 before and after both imports:
58d27ca8586970797bc16a4f6255b54a119c23431f780ddf7cc419af0b6ad521

Original tail: 68 PeerLinks; 69 PeerLinkFence; 70 WaitingLinkRequestIndex.
Head destination tail: 68 ShellStopRequestIndex; 69 ThreadMessageSearch; 70 PeerLinks; migrations continued through 80 ScheduledTaskThreadMode.

Each screenshot pair taken at least 500ms apart was byte-identical.
Base screenshot SHA-256: c988bc10478531ca7b2e0cf4c9f6a278f70214c4a0f758d2bf8b3f3f8ec687bd
Head screenshot SHA-256: 3f7ef0cd5e0c3604c3c1b9c0f728037360fc3e9617df5d4f99df0fbd56395431