REAL SERVER RUNTIME OBSERVATION
Commit: 1485ba966a6942513cede3759b05acacfda3c974
Surface: web client, Chromium, 1280 x 800 CSS pixels, light theme
State: isolated server database; synthetic git project; no live-state seed
Provider: real Claude Code 2.1.322; resume cursor removed from synthetic session JSONL

Initial native session: 637514e2-e1e1-4040-b8fd-473c41247f27
Removed alpha assistant response: a4e96dfc-df05-4cc2-af54-f49e66818751
UI: beta > Edit from here > Revert and keep changes
Native resume cursor after rewind: a4e96dfc-df05-4cc2-af54-f49e66818751

Sent gamma in web client. Run 3 failed before prompt attachment.
Automatic Background activity updated caused run 4; it also failed.
Both failures: ProviderAdapterTurnStartError / ProviderAdapterProtocolError
Detail: Claude provider query ended before the turn could start.

READ-ONLY DATABASE SNAPSHOT AFTER THE TWO REJECTIONS:
{
  "originalSession": "637514e2-e1e1-4040-b8fd-473c41247f27",
  "currentSession": "637514e2-e1e1-4040-b8fd-473c41247f27",
  "sameSession": true,
  "runs": [
    {
      "ordinal": 1,
      "status": "completed"
    },
    {
      "ordinal": 2,
      "status": "rolled_back"
    },
    {
      "ordinal": 3,
      "status": "failed"
    },
    {
      "ordinal": 4,
      "status": "failed"
    }
  ]
}
{
  "handoffs": [
    {
      "strategy": "delta_since_target_last_seen",
      "delivery": null
    }
  ]
}

Restored the saved JSONL to the ORIGINAL native session file.
Sent epsilon in web client; run 5 completed and assistant replied epsilon.

READ-ONLY DATABASE SNAPSHOT AFTER REPAIR AND EPSILON:
{
  "originalSession": "637514e2-e1e1-4040-b8fd-473c41247f27",
  "currentSession": "637514e2-e1e1-4040-b8fd-473c41247f27",
  "sameSession": true,
  "runs": [
    {
      "ordinal": 1,
      "status": "completed"
    },
    {
      "ordinal": 2,
      "status": "rolled_back"
    },
    {
      "ordinal": 3,
      "status": "failed"
    },
    {
      "ordinal": 4,
      "status": "failed"
    },
    {
      "ordinal": 5,
      "status": "completed"
    }
  ]
}
{
  "handoffs": [
    {
      "strategy": "delta_since_target_last_seen",
      "delivery": {
        "nativeThreadId": "637514e2-e1e1-4040-b8fd-473c41247f27",
        "status": "inline"
      }
    },
    {
      "strategy": "delta_since_target_last_seen",
      "delivery": {
        "nativeThreadId": "637514e2-e1e1-4040-b8fd-473c41247f27",
        "status": "inline"
      }
    }
  ]
}

No fresh-session recovery warning for this thread.

NATIVE JSONL ASSISTANT RESPONSE CHECK:
original session 637514e2-e1e1-4040-b8fd-473c41247f27: contains exact epsilon response = True
current session 637514e2-e1e1-4040-b8fd-473c41247f27: contains exact epsilon response = True

AI-assisted; verified with the tests and tools listed above.
No automated tests were used as proof; these observations came from the real running server and web client.