---
phase: 17-telegram-scheduler
plan: 02
subsystem: scheduler
tags: [gocron, sqlite, cron, scheduler, telegram]

requires:
  - phase: 01-foundation
    provides: pkg/storage DB wrapper with schema.sql embed pattern
provides:
  - pkg/scheduler/ package with gocron wrapper, start/stop lifecycle
  - Storage CRUD for subscribers table (Add/Remove/List/IsSubscribed)
  - Storage CRUD for scheduled_jobs table (Save/List/Get/Delete/UpdateLastRun/SetEnabled)
  - subscribers and scheduled_jobs SQLite tables in schema.sql
affects: [17-telegram-scheduler, 17-03, 17-04, 17-05]

tech-stack:
  added: [gocron/v2 v2.19.1]
  patterns: [scheduler wraps gocron with DB persistence, ScanFunc abstraction decouples from engine]

key-files:
  created:
    - pkg/scheduler/scheduler.go
    - pkg/scheduler/jobs.go
    - pkg/scheduler/scheduler_test.go
    - pkg/storage/subscribers.go
    - pkg/storage/scheduled_jobs.go
  modified:
    - pkg/storage/schema.sql
    - go.mod
    - go.sum

key-decisions:
  - "Scheduler.ScanFunc callback decouples from engine -- Plan 17-04 wires the real scan logic"
  - "OnComplete callback bridges scheduler to notification system without direct bot dependency"
  - "Disabled jobs skipped during Start() but remain in DB for re-enabling"

patterns-established:
  - "Scheduler pattern: gocron wrapper with DB persistence and callback-based extensibility"

requirements-completed: [SCHED-01]

duration: 2min
completed: 2026-04-06
---

# Phase 17 Plan 02: Scheduler + Storage Summary

**gocron v2.19.1 wrapper with SQLite persistence for subscribers and scheduled scan jobs, callback-based scan/notify extensibility**

## Performance

- **Duration:** 2 min
- **Started:** 2026-04-06T14:25:04Z
- **Completed:** 2026-04-06T14:27:08Z
- **Tasks:** 2
- **Files modified:** 8

## Accomplishments
- Created pkg/scheduler/ package wrapping gocron with Start/Stop lifecycle and DB-backed job persistence
- Implemented full CRUD for subscribers (Add/Remove/List/IsSubscribed) and scheduled_jobs (Save/List/Get/Delete/UpdateLastRun/SetEnabled)
- Added subscribers and scheduled_jobs tables to schema.sql
- All 5 tests pass: storage round-trip, subscriber round-trip, scheduler start/add/remove/run

## Task Commits

Each task was committed atomically:

1. **Task 1: Add gocron dependency, create storage tables, and subscriber/job CRUD** - `c8f7592` (feat)
2. **Task 2 RED: Failing tests for scheduler package** - `89cc133` (test)
3. **Task 2 GREEN: Implement scheduler package** - `c71faa9` (feat)

## Files Created/Modified
- `pkg/scheduler/scheduler.go` - Scheduler struct wrapping gocron with Start/Stop/AddJob/RemoveJob/RunJob/ListJobs
- `pkg/scheduler/jobs.go` - Job and JobResult types
- `pkg/scheduler/scheduler_test.go` - 5 tests covering storage, subscriber, and scheduler lifecycle
- `pkg/storage/subscribers.go` - Subscriber struct and CRUD methods on DB
- `pkg/storage/scheduled_jobs.go` - ScheduledJob struct and CRUD methods on DB
- `pkg/storage/schema.sql` - subscribers and scheduled_jobs CREATE TABLE statements
- `go.mod` - gocron/v2 v2.19.1 promoted to direct dependency
- `go.sum` - Updated checksums

## Decisions Made
- ScanFunc callback decouples scheduler from engine -- Plan 17-04 wires real scan logic
- OnComplete callback bridges scheduler to notification system without direct bot dependency
- Disabled jobs skipped during Start() but remain in DB for re-enabling via SetJobEnabled

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- pkg/scheduler/ ready for CLI wiring in Plan 17-03 (schedule add/list/remove commands)
- Subscriber storage ready for bot /subscribe handler in Plan 17-01
- OnComplete callback ready for notification bridge in Plan 17-04

---
*Phase: 17-telegram-scheduler*
*Completed: 2026-04-06*