Deploy sealed green with 4 DB-less site nodes acking (central persists acks);
ServiceLevel held 240 on a site node with central SQL stopped (survive-alone);
restarted site node booted last-known-good from the LocalDb pointer, no ConfigDb
read; alarm_condition_state table live + replicated. Full record in
2026-07-23-mesh-phase4-live-gate.md. Task 9 (drop dead table) deferred.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Task 4+6 code review re-surfaced the OpcUaPublishActor raw-sink wipe on a
null-factory node (the exact #485/#486 defect Task 3 fixes) — Task 3 must land
before any node flips to FetchAndCache. Ordering already enforces this
(3 → 7 → 10 → 11).
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Nullable ConfigDb factory; UpsertNodeDeploymentState no-ops when absent
(central persists acks from the ApplyAck); scripted-alarm condition state
served from the LocalDb store instead of the ConfigDb-backed Ef store.
Combines Phase-4 Tasks 4 + 6. Removes the interim dbFactory! cast.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Task 2 code review surfaced two unguarded ConfigDb sites reachable on a
driver-only node once Tasks 0+1 landed (SpawnScriptedAlarmHost's Ef store,
unconditional UpsertNodeDeploymentState). Task 4 brief now names them + the
dbFactory! removal; Task 6 re-homes the alarm store to LocalDb.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Phase 4 of the per-cluster mesh program. Removes the four remaining driver-side
ConfigDb consumers + the registration itself so a driver-only node boots with no
ConfigDb connection string:
- ConfigDb registered iff hasAdmin (Program.cs); driver-only requires none
- driver-only ⇒ FetchAndCache mandatory (validator)
- DbHealthProbeActor not spawned on driver-only; DbReachable=true constant
(client-visible ServiceLevel change — a healthy DB-less node publishes 240/250
with central down, per user decision 2026-07-23)
- DriverHostActor: nullable factory, drop redundant SQL ack-writes (central's
PersistNodeAck is the ack system of record)
- EfAlarmConditionStateStore → LocalDbAlarmConditionStateStore (new replicated
alarm_condition_state table)
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
Joseph Doherty