A fresh consistent Tyrell SQLite backup was created on rdmbair15m5 before any Build 24 canary mutation; the healthy Build 17/15 runtime was not changed and the Build 24 candidate remains untransferred and unlaunched.

Tyrell Build 24 preflight database backup

• Time: 2026-09-14 21:44 EDT
• Acting runtime host: rdmbair15m5
• Coordinating host: rdmpw3275m
• Canonical evidence host: rdmsm4x
• Tickets: ISSUE-20260914-15, ISSUE-20260912-01

What changed

• Created a consistent preflight SQLite backup at /Users/richh/Library/Application Support/Tyrell/backups/20260914-2144-build24-r1-preflight-3834d45/tyrell.db using SQLite's backup operation against the live database.
• Set the backup to mode 600.
• Did not stop or replace the Build 15 daemon, did not replace the Build 17 app, did not transfer the Build 24 stage, and did not start a guard or canary clock.

Verification

• Backup SHA-256: f042ddb7f32ea2fb3b1c48813daae27cc6c343cc7cc3bd934fd0ecbeacc354a6
• PRAGMA quick_check: ok
• File rows: 153,929
• Additive last_seen_at column count: 1
• Journal mode recorded as delete
• Exact healthy runtime at the verification boundary remained daemon PID 24582, app PID 24768, and menu-bar helper PID 24816.
• Build 24 stage transferred: no
• Build 24 app installed: no
• Build 24 daemon installed: no
• Canary guard started: no

Undo and outstanding actions

• This backup is additive and does not require rollback. Retain it through Build 24 canary acceptance and fleet rollout so the preflight database state remains recoverable.
• Do not use the backup to overwrite the live database unless a separately authorized and evidence-backed recovery requires it.
• Explicit runtime-freeze acknowledgment from claude@rdmbair15m5/dev-a7 remains required before any Build 24 transfer, install, or launch.
• This Markdown changelog is mirrored to the canonical archive. Apple Notes filing is pending from an Aqua session on rdmbair15m5.