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+# Timer Sensor Complete Implementation
+
+**Date**: 2026-02-04
+**Component**: Timer Sensor (`attune-core-timer-sensor`)
+**Status**: ✅ Complete
+
+## Summary
+
+Implemented full support for all three timer trigger types in the timer sensor using `tokio-cron-scheduler` for efficient asynchronous scheduling. The timer sensor now handles interval timers, cron timers, and one-shot datetime timers seamlessly.
+
+## Changes Made
+
+### 1. Dependencies
+- **Added**: `tokio-cron-scheduler = "0.15"` to `crates/sensor-timer/Cargo.toml`
+- Provides robust, async-first cron scheduling with support for:
+  - Repeated jobs (intervals)
+  - Cron expression-based scheduling
+  - One-shot jobs (datetime)
+
+### 2. Timer Manager Refactoring (`timer_manager.rs`)
+
+**Architecture Changes**:
+- Replaced individual `JoinHandle<()>` per timer with shared `JobScheduler` instance
+- Added job UUID tracking: `HashMap<rule_id, job_uuid>` 
+- Wrapped scheduler in `Mutex` for safe shutdown access
+- Made constructor async to initialize and start scheduler
+
+**Key Methods Updated**:
+- `new()` → async, creates and starts JobScheduler
+- `start_timer()` → Uses scheduler to add jobs, tracks UUIDs
+- `stop_timer()` → Removes jobs from scheduler by UUID
+- `stop_all()` → Removes all tracked jobs
+- `shutdown()` → NEW: Gracefully shuts down the scheduler
+
+**Job Creation Methods**:
+```rust
+// Interval timers
+async fn create_interval_job(...) -> Result<Job>
+  - Uses Job::new_repeated_async()
+  - Converts time units to seconds
+  - Creates "core.intervaltimer" events
+
+// Cron timers  
+async fn create_cron_job(...) -> Result<Job>
+  - Uses Job::new_async() with cron expression
+  - Queries next fire time from scheduler
+  - Creates "core.crontimer" events
+
+// DateTime timers
+async fn create_datetime_job(...) -> Result<Job>
+  - Uses Job::new_one_shot_async()
+  - Calculates duration until fire time
+  - Validates fire time is in future
+  - Creates "core.datetimetimer" events
+```
+
+**Event Payloads**:
+Each timer type now generates events with correct trigger ref and payload schema:
+
+| Timer Type | Trigger Ref | Key Fields |
+|------------|-------------|------------|
+| Interval | `core.intervaltimer` | `interval_seconds`, `execution_count` |
+| Cron | `core.crontimer` | `expression`, `next_fire_at`, `execution_count` |
+| DateTime | `core.datetimetimer` | `fire_at`, `fired_at`, `delay_ms` |
+
+### 3. Main Service (`main.rs`)
+
+Updated to handle async timer manager:
+```rust
+// Create timer manager (now async)
+let timer_manager = TimerManager::new(api_client.clone())
+    .await
+    .context("Failed to initialize timer manager")?;
+
+// Shutdown handling
+timer_manager.shutdown().await?;
+```
+
+### 4. Sensor Configuration (`packs/core/sensors/interval_timer_sensor.yaml`)
+
+Updated to reflect support for all three timer types:
+- Changed description from "interval timer" to "timer" sensor
+- Added trigger types: `core.crontimer`, `core.datetimetimer`
+- Updated documentation with examples for all three types
+- Clarified that tokio-cron-scheduler is used
+
+### 5. Comprehensive Testing
+
+Added 4 new integration tests:
+1. `test_all_timer_types_comprehensive` - Tests all three types concurrently
+2. `test_cron_various_expressions` - Validates multiple cron patterns
+3. `test_datetime_timer_future_validation` - Tests various future times
+4. `test_mixed_timer_replacement` - Tests switching timer types for same rule
+
+**Test Results**: ✅ 34 tests passing (30 existing + 4 new)
+
+### 6. Documentation
+
+Created comprehensive documentation:
+
+**`docs/sensors/timer-sensor-implementation.md`** (6.7K):
+- Overview of all three timer types
+- Use cases for each type
+- Configuration examples
+- Event payload schemas
+- Implementation details
+- Architecture explanation
+- Testing guide
+
+**`docs/QUICKREF-timer-types.md`** (2.6K):
+- Quick reference for all timer types
+- Common examples
+- Cron format guide
+- Decision matrix for choosing timer type
+- Event payload summaries
+
+## Technical Highlights
+
+### Efficient Scheduling
+- Single shared `JobScheduler` for all timers across all rules
+- Async-first design with tokio integration
+- Low overhead job management with UUID tracking
+- Clean job lifecycle: creation → tracking → removal → cleanup
+
+### Cron Expression Support
+Uses `croner` crate (via tokio-cron-scheduler) for cron parsing:
+- Standard 6-field format: `second minute hour day month weekday`
+- Supports special characters: `*`, `,`, `-`, `/`
+- Built-in validation of expressions
+- Query next execution time
+
+### One-Shot Timer Handling
+DateTime timers:
+- Validate fire time is in future (reject past times)
+- Calculate duration until fire time using chrono
+- Fire exactly once, then automatically cleaned up
+- Track delay between scheduled and actual fire time
+
+### Graceful Shutdown
+- Stops all active timers
+- Properly shuts down scheduler
+- Prevents job execution after shutdown signal
+- Clean resource cleanup
+
+## Example Usage
+
+### Interval Timer (Every 30 seconds)
+```yaml
+trigger_ref: core.intervaltimer
+parameters:
+  unit: seconds
+  interval: 30
+```
+
+### Cron Timer (Weekdays at 9 AM)
+```yaml
+trigger_ref: core.crontimer
+parameters:
+  expression: "0 0 9 * * 1-5"
+  timezone: "UTC"
+```
+
+### DateTime Timer (New Year's Eve)
+```yaml
+trigger_ref: core.datetimetimer
+parameters:
+  fire_at: "2024-12-31T23:59:59Z"
+  timezone: "UTC"
+```
+
+## Testing Evidence
+
+```bash
+$ cargo test -p attune-core-timer-sensor
+running 34 tests
+test result: ok. 34 passed; 0 failed; 0 ignored
+
+$ cargo check -p attune-core-timer-sensor --all-targets
+Finished `dev` profile [unoptimized + debuginfo]
+# Zero warnings ✅
+```
+
+## Benefits
+
+1. **Complete Feature Parity**: All three timer types now fully functional
+2. **Robust Scheduling**: Production-ready cron scheduler library
+3. **Efficient Resource Usage**: Single scheduler for all timers
+4. **Clean Architecture**: Clear separation of timer types
+5. **Comprehensive Testing**: All timer types and edge cases covered
+6. **Well Documented**: Implementation guide and quick reference
+
+## Future Enhancements
+
+Potential improvements identified in documentation:
+- Full timezone support for cron expressions (currently UTC only)
+- Persistence for job recovery after restart
+- Job execution history and statistics
+- Advanced scheduling (chaining, dependencies, priorities)
+- Performance metrics and monitoring
+
+## Files Modified
+
+- `crates/sensor-timer/Cargo.toml` - Added tokio-cron-scheduler dependency
+- `crates/sensor-timer/src/timer_manager.rs` - Complete refactor for all timer types
+- `crates/sensor-timer/src/main.rs` - Updated for async constructor and shutdown
+- `packs/core/sensors/interval_timer_sensor.yaml` - Updated sensor metadata
+
+## Files Created
+
+- `docs/sensors/timer-sensor-implementation.md` - Complete implementation guide
+- `docs/QUICKREF-timer-types.md` - Quick reference for timer types
+- `work-summary/2026-02-04-timer-sensor-complete-implementation.md` - This file
+
+## Compatibility
+
+- ✅ Backward compatible with existing interval timers
+- ✅ Adds new functionality (cron and datetime)
+- ✅ No breaking changes to API or configuration
+- ✅ Existing rules continue to work unchanged
+
+## Conclusion
+
+The timer sensor is now feature-complete with support for all three timer types. The implementation uses industry-standard scheduling patterns, comprehensive testing, and clear documentation. The sensor is production-ready for handling diverse timing requirements in Attune workflows.