the-other-dude/.planning/phases/03-snapshot-ingestion/03-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
03-snapshot-ingestion	01	api	nats jetstream openbao transit encryption postgresql prometheus dedup	phase provides 01-database-schema RouterConfigSnapshot model and router_config_snapshots table phase provides 02-poller-config-collection Go poller publishes config.snapshot.> NATS messages	NATS subscriber consuming config.snapshot.> messages SHA256 dedup preventing duplicate snapshot storage OpenBao Transit encryption of config text before INSERT Prometheus metrics for ingestion monitoring	04-diff-engine snapshot-api config-timeline	added patterns prometheus_client nats-subscriber-with-dedup transit-encrypt-before-insert	created modified backend/app/services/config_snapshot_subscriber.py backend/tests/test_config_snapshot_subscriber.py backend/app/main.py	Trust poller-provided SHA256 hash (no recompute on backend) Raw SQL for dedup SELECT and INSERT (consistent with nats_subscriber.py pattern) OpenBao Transit service instantiated per-message with close() for connection hygiene	Config snapshot ingestion: dedup by SHA256 -> encrypt -> INSERT -> ack Transit failure causes nak (NATS retry), plaintext never stored as fallback	STOR-02	4min	2026-03-13

Phase 3 Plan 1: Config Snapshot Subscriber Summary

NATS subscriber ingesting config snapshots with SHA256 dedup, OpenBao Transit encryption, and Prometheus metrics

Performance

• Duration: 4 min
• Started: 2026-03-13T02:44:01Z
• Completed: 2026-03-13T02:48:08Z
• Tasks: 2
• Files modified: 3

Accomplishments

• NATS subscriber consuming config.snapshot.> on DEVICE_EVENTS stream with durable consumer
• SHA256 dedup: duplicate snapshots silently skipped at debug level with Prometheus counter
• OpenBao Transit encryption: plaintext never stored in PostgreSQL, Transit failure causes nak
• Malformed and orphan device messages acked and discarded safely with warning logs
• 6 unit tests covering all handler paths (new, duplicate, encrypt fail, malformed, orphan, first)
• Wired into main.py lifespan with non-fatal startup pattern

Task Commits

Each task was committed atomically:

1. Task 1 (RED): Failing tests - 9d82741 (test)
2. Task 1 (GREEN): Config snapshot subscriber - 3ab9f27 (feat)
3. Task 2: Wire into main.py lifespan - 0db0641 (feat)

TDD task had RED + GREEN commits

Files Created/Modified

• backend/app/services/config_snapshot_subscriber.py - NATS subscriber with dedup, encryption, metrics
• backend/tests/test_config_snapshot_subscriber.py - 6 unit tests for all handler paths
• backend/app/main.py - Lifespan wiring for start/stop

Decisions Made

• Trust poller-provided SHA256 hash (no recompute on backend) -- per project decision
• Raw SQL for dedup SELECT and INSERT -- consistent with existing nats_subscriber.py pattern
• OpenBao Transit service instantiated per-message with close() -- connection hygiene
• config_text never appears in any log statement -- contains passwords and keys

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Config snapshot subscriber ready to receive messages from Go poller
• RouterConfigSnapshot rows will be available for diff engine (Phase 4)
• Prometheus metrics exposed for monitoring ingestion rate and errors

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Phase: 03-snapshot-ingestion Completed: 2026-03-13