docs(localdb): phase 2 implementation plan (21 tasks, full scope)
Moves scadabridge.db's 9 config tables + sf_messages into the consolidated LocalDb file and deletes SiteReplicationActor + StoreAndForward's ReplicationService. Resolves the phase 2 gate's five open questions from code recon (D1-D5): D1 notify-and-fetch is DELETED, not preserved. It exists only because the config blob exceeds Akka's 128KB frame; LocalDb sync is gRPC. The deployed_at version guard protected against a stale fetch racing, so it dies with the fetch. Do not reproduce it on LWW - different clocks. D2 ReplaceAllAsync is deleted and the N1 directional guard becomes unnecessary: LocalDb's snapshot resync merges per-row LWW and never deletes (SnapshotApplier has no DELETE; LwwApplier.cs:69-78 discards a lower-HLC incoming row). Semantic change - the standby is convergent, no longer byte-identical. D3 The SMTP purge (plaintext passwords) rides the replication path and is re-homed to the active node BEFORE any deletion. D4 native_alarm_state volume is measured by a rig soak, not assumed. Task 1 gates the plan and stops it if the oplog cannot absorb the churn. D5 No dual-mechanism period forecloses rolling site upgrades - both nodes must stop and start together. Recon also found the gate doc's "two test files are the spec" undercounts: the real specification is five files, including the N1 Critical regression test and the only Requeue coverage. Claude-Session: https://claude.ai/code/session_01BL2Vu1ESDQ9SCN4gVKkdts
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Joseph Doherty