# LNM Backfill Plan (DEVOPS-LNM-22-001)

## Goal
Run staging backfill for advisory observations/linksets, validate counts/conflicts, and document rollout steps for production.

## Prereqs
- Concelier API CCLN0102 available (advisory/linkset endpoints stable).
- Staging Mongo snapshot taken (pre-backfill) and stored at `s3://staging-backups/concelier-pre-lnmbf.gz`.
- NATS/Redis staging brokers reachable.

## Steps
1) Seed snapshot
   - Restore staging Mongo from pre-backfill snapshot.
2) Run backfill job
   - `dotnet run --project src/Concelier/StellaOps.Concelier.Backfill -- --mode=observations --batch-size=500 --max-conflicts=0`
   - `dotnet run --project src/Concelier/StellaOps.Concelier.Backfill -- --mode=linksets --batch-size=500 --max-conflicts=0`
3) Validate counts
   - Compare `advisory_observations_total` and `linksets_total` vs expected inventory; export to `.artifacts/lnm-counts.json`.
   - Check conflict log `.artifacts/lnm-conflicts.ndjson` (must be empty).
4) Events/NATS smoke
   - Ensure `concelier.lnm.backfill.completed` emitted; verify Redis/NATS queues drained.
5) Roll-forward checklist
   - Promote batch size to 2000 for prod, keep `--max-conflicts=0`.
   - Schedule maintenance window, ensure snapshot available for rollback.

## Outputs
- `.artifacts/lnm-counts.json`
- `.artifacts/lnm-conflicts.ndjson` (empty)
- Log of job runtime + throughput.

## Acceptance
- Zero conflicts; counts match expected; events emitted; rollback plan documented.