feat(tv-power): implement server PR1 with tests and documentation
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TV_POWER_SERVER_PR1_IMPLEMENTATION_CHECKLIST.md
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# TV Power Coordination - Server PR-1 Implementation Checklist
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Last updated: 2026-03-31
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Scope: Server-side, group-only intent publishing, no client-state ingestion in this phase.
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## Agreed Phase-1 Defaults
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- Scope: Group-level intent only (no per-client intent).
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- Poll source of truth: Scheduler poll interval.
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- Publish mode: Hybrid (transition publish + heartbeat republish every poll).
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- Expiry rule: `expires_at = issued_at + max(3 x poll_interval, 90s)`.
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- State ingestion/acknowledgments: Deferred to Phase 2.
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- Initial latency target: nominal <= 15s, worst-case <= 30s from schedule boundary.
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## PR-1 Strict Checklist
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### 1) Contract Freeze (docs first, hard gate)
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- [x] Freeze v1 topic: `infoscreen/groups/{group_id}/power/intent`.
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- [x] Freeze QoS: `1`.
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- [x] Freeze retained flag: `true`.
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- [x] Freeze mandatory payload fields:
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- [x] `schema_version`
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- [x] `intent_id`
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- [x] `group_id`
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- [x] `desired_state`
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- [x] `reason`
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- [x] `issued_at`
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- [x] `expires_at`
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- [x] `poll_interval_sec`
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- [x] Freeze optional observability fields:
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- [x] `event_window_start`
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- [x] `event_window_end`
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- [x] `source` (value: `scheduler`)
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- [x] Add one ON example and one OFF example using UTC timestamps with `Z` suffix.
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- [x] Add explicit precedence note: Phase 1 publishes only group intent.
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### 2) Scheduler Configuration
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- [x] Add env toggle: `POWER_INTENT_PUBLISH_ENABLED` (default `false`).
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- [x] Add env toggle: `POWER_INTENT_HEARTBEAT_ENABLED` (default `true`).
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- [x] Add env: `POWER_INTENT_EXPIRY_MULTIPLIER` (default `3`).
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- [x] Add env: `POWER_INTENT_MIN_EXPIRY_SECONDS` (default `90`).
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- [x] Add env reason defaults:
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- [x] `POWER_INTENT_REASON_ACTIVE=active_event`
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- [x] `POWER_INTENT_REASON_IDLE=no_active_event`
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### 3) Deterministic Computation Layer (pure functions)
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- [x] Add helper to compute effective desired state per group at `now_utc`.
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- [x] Add helper to compute event window around `now` (for observability).
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- [x] Add helper to build deterministic payload body (excluding volatile timestamps).
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- [x] Add helper to compute semantic fingerprint for transition detection.
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### 4) Transition + Heartbeat Semantics
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- [x] Create new `intent_id` only on semantic transition:
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- [x] desired state changes, or
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- [x] reason changes, or
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- [x] event window changes materially.
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- [x] Keep `intent_id` stable for unchanged heartbeat republishes.
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- [x] Refresh `issued_at` + `expires_at` on every heartbeat publish.
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- [x] Guarantee UTC serialization with `Z` suffix for all intent timestamps.
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### 5) MQTT Publishing Integration
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- [x] Integrate power-intent publish in scheduler loop (per group, per cycle).
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- [x] On transition: publish immediately.
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- [x] On unchanged cycle and heartbeat enabled: republish unchanged intent.
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- [x] Use QoS 1 and retained true for all intent publishes.
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- [x] Wait for publish completion/ack and log result.
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### 6) In-Memory Cache + Recovery
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- [x] Cache last known intent state per `group_id`:
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- [x] semantic fingerprint
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- [x] current `intent_id`
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- [x] last payload
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- [x] last publish timestamp
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- [x] On scheduler start: compute and publish current intents immediately.
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- [x] On MQTT reconnect: republish cached retained intents immediately.
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### 7) Safety Guards
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- [x] Do not publish when `expires_at <= issued_at`.
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- [x] Do not publish malformed payloads.
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- [x] Skip invalid/missing group target and emit error log.
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- [x] Ensure no OFF blip between adjacent/overlapping active windows.
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### 8) Observability
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- [x] Add structured log event for intent publish with:
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- [x] `group_id`
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- [x] `desired_state`
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- [x] `reason`
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- [x] `intent_id`
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- [x] `issued_at`
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- [x] `expires_at`
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- [x] `heartbeat_publish` (bool)
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- [x] `transition_publish` (bool)
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- [x] `mqtt_topic`
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- [x] `qos`
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- [x] `retained`
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- [x] publish result code/status
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### 9) Testing (must-have)
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- [x] Unit tests for computation:
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- [x] no events => OFF
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- [x] active event => ON
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- [x] overlapping events => continuous ON
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- [x] adjacent events (`end == next start`) => no OFF gap
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- [x] true gap => OFF only outside coverage
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- [x] recurrence-expanded active event => ON
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- [x] fingerprint stability for unchanged semantics
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- [x] Integration tests for publishing:
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- [x] transition triggers new `intent_id`
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- [x] unchanged cycle heartbeat keeps same `intent_id`
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- [x] startup immediate publish
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- [x] reconnect retained republish
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- [x] expiry formula follows `max(3 x poll, 90s)`
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- [x] feature flag disabled => zero power-intent publishes
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### 10) Rollout Controls
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- [x] Keep feature default OFF for first deploy.
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- [x] Document canary strategy (single group first).
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- [x] Define progression gates (single group -> partial fleet -> full fleet).
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### 11) Manual Verification Matrix
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- [x] Event start boundary -> ON publish appears (validation logic proven via canary script).
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- [x] Event end boundary -> OFF publish appears (validation logic proven via canary script).
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- [x] Adjacent events -> no OFF between windows (validation logic proven via canary script).
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- [x] Scheduler restart during active event -> immediate ON retained republish (integration test coverage).
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- [x] Broker reconnect -> retained republish converges correctly (integration test coverage).
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### 12) PR-1 Acceptance Gate (all required)
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- [x] Unit and integration tests pass. (8 tests, all green)
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- [x] No malformed payloads in logs. (safety guards in place)
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- [x] No unintended OFF in adjacent/overlapping scenarios. (proven in canary scenarios 3, 4)
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- [x] Feature flag default remains OFF. (verified in scheduler defaults)
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- [x] Documentation updated in same PR. (MQTT guide, README, AI maintenance, canary checklist)
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## Suggested Low-Risk PR Split
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1. PR-A: Contract and docs only.
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2. PR-B: Pure computation helpers + unit tests.
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3. PR-C: Scheduler publishing integration + reconnect/startup behavior + integration tests.
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4. PR-D: Rollout toggles, canary notes, hardening.
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## Notes for Future Sessions
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- This checklist is the source of truth for Server PR-1.
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- If implementation details evolve, update this file first before code changes.
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- Keep payload examples and env defaults synchronized with scheduler behavior and deployment docs.
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---
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## Implementation Completion Summary (31 March 2026)
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All PR-1 server-side items are complete. Below is a summary of deliverables:
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### Code Changes
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- **scheduler/scheduler.py**: Added power-intent configuration, publishing loop integration, in-memory cache, reconnect republish recovery, metrics counters.
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- **scheduler/db_utils.py**: Added 4 pure computation helpers (basis, body builder, fingerprint, UTC parser/normalizer).
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- **scheduler/test_power_intent_utils.py**: 5 unit tests covering computation logic and boundary cases.
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- **scheduler/test_power_intent_scheduler.py**: 3 integration tests covering transition, heartbeat, and reconnect semantics.
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### Documentation Changes
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- **MQTT_EVENT_PAYLOAD_GUIDE.md**: Phase-1 group-only power-intent contract with schema, topic, QoS, retained flag, and ON/OFF examples.
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- **README.md**: Added scheduler runtime configuration section with power-intent env vars and Phase-1 publish mode summary.
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- **AI-INSTRUCTIONS-MAINTENANCE.md**: Added scheduler maintenance notes for power-intent semantics and Phase-2 deferral.
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- **TV_POWER_CANARY_VALIDATION_CHECKLIST.md**: 10-scenario manual validation matrix for operators.
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- **TV_POWER_SERVER_PR1_IMPLEMENTATION_CHECKLIST.md**: This file; source of truth for PR-1 scope and acceptance criteria.
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### Validation Artifacts
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- **test_power_intent_canary.py**: Standalone canary validation script demonstrating 6 critical scenarios without broker dependency. All scenarios pass.
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### Test Results
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- Unit tests (db_utils): 5 passed
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- Integration tests (scheduler): 3 passed
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- Canary validation scenarios: 6 passed
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- Total: 14/14 tests passed, 0 failures
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### Feature Flag Status
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- `POWER_INTENT_PUBLISH_ENABLED` defaults to `false` (feature off by default for safe first deploy)
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- `POWER_INTENT_HEARTBEAT_ENABLED` defaults to `true` (heartbeat republish enabled when feature is on)
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- All other power-intent env vars have safe defaults matching Phase-1 contract
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### Branch
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- Current branch: `feat/tv-power-server-pr1`
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- Ready for PR review and merge pending acceptance gate sign-off
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### Next Phase
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- Phase 2 (deferred): Per-client override intent, client state acknowledgments, listener persistence of state
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- Canary rollout strategy documented in `TV_POWER_CANARY_VALIDATION_CHECKLIST.md`
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