REAL SERVER RUNTIME OBSERVATION
Commit: 82465ed26a6c765e538a500d284ed54c30d3e725
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: ae842c40-d4e0-4c20-8a12-4d374e38f551
Removed alpha assistant response: 905e3314-491a-453e-9927-dcde556a5de9
UI: beta > Edit from here > Revert and keep changes
Native resume cursor after rewind: 905e3314-491a-453e-9927-dcde556a5de9

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": "ae842c40-d4e0-4c20-8a12-4d374e38f551",
  "currentSession": "ae842c40-d4e0-4c20-8a12-4d374e38f551",
  "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": {
        "nativeThreadId": "ae842c40-d4e0-4c20-8a12-4d374e38f551",
        "status": "pending"
      }
    }
  ]
}

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": "ae842c40-d4e0-4c20-8a12-4d374e38f551",
  "currentSession": "1439a686-97d3-45a0-a3e3-fd4daa5198e6",
  "sameSession": false,
  "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": "1439a686-97d3-45a0-a3e3-fd4daa5198e6",
        "status": "inline"
      }
    },
    {
      "strategy": "full_thread_summary",
      "delivery": {
        "nativeThreadId": "1439a686-97d3-45a0-a3e3-fd4daa5198e6",
        "status": "inline"
      }
    }
  ]
}

MATCHING REAL SERVER LOG:
WARN Recovering provider context in a fresh native session
reason: uncertain_history_delivery
errorTag: ProviderAdapterTurnStartError

NATIVE JSONL ASSISTANT RESPONSE CHECK:
original session ae842c40-d4e0-4c20-8a12-4d374e38f551: contains exact epsilon response = False
current session 1439a686-97d3-45a0-a3e3-fd4daa5198e6: 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.