Phases 3-5 Sprint Report
Sprint Summary
Phases 3-5 complete the auto-download system by adding smart retry with exponential backoff, download scheduling for off-peak hours, and a full audit trail with a history timeline UI. These build on Phase 1's error classification/circuit breaker and Phase 2's batch manager to deliver a fully autonomous, operator-visible download pipeline.
FC-26 Stats Capture — Auto-Download System · Sprint Date: 2026-02-15 · Branch: feat/auto-download-phase345
Phase 3: Smart Retry
What It Does
Automatically retries failed downloads with exponential backoff. Transient failures (network issues, rate limiting) get up to 3 retry attempts at increasing intervals. Permanent failures (deleted/private videos) are never retried.
Backoff Schedule
| Attempt | Wait Time | Example |
|---|---|---|
| 1st retry | 15 minutes | Failed at 10:00 → retry at 10:15 |
| 2nd retry | 1 hour | Failed at 10:15 → retry at 11:15 |
| 3rd retry | 4 hours | Failed at 11:15 → retry at 15:15 |
| Exhausted | — | Stays failed, operator must manually retry |
Key Implementation Details
- retry_count and next_retry_at columns added to youtube_feed_items table
- max_retry_attempts configurable via config registry (default: 3)
- Manual retry via API resets retry counter to 0
- Retry eligibility query: download_status='failed' AND retry_count < max AND next_retry_at <= now()
- UI shows retry badge ("Retry 1/3") and next retry countdown
Phase 4: Download Schedule
What It Does
Restricts downloads to configurable time windows. Default: 22:00–08:00 Africa/Johannesburg (off-peak for South African ISPs). Downloads outside the window are blocked with an audit log entry.
Schedule Configuration
| Setting | Default | Description |
|---|---|---|
| enabled | false | Schedule must be explicitly enabled |
| timezone | Africa/Johannesburg | IANA timezone for schedule evaluation |
| windows | 22:00–08:00 daily | Day-of-week and time range pairs |
Key Implementation Details
- download_schedule JSON config in registry with type-safe parsing
- Schedule checker handles midnight-crossing windows (22:00–08:00)
- Uses luxon for timezone conversion
- "Download Now" override button bypasses schedule check
- Amber UI banner shows when outside schedule window
- schedule_blocked event logged (no silent skips)
Phase 5: Audit & History
What It Does
Comprehensive audit trail of all download lifecycle events. Every download start, completion, failure, retry, circuit breaker action, and schedule block is logged to a queryable events table with a visual timeline UI.
Event Types
| Event | Source | Details |
|---|---|---|
| download_started | downloadVideo() | videoId, title, batchId |
| download_completed | downloadVideo() | videoId, title, fileSizeBytes, durationSeconds |
| download_failed | downloadVideo() | videoId, error, errorCategory, retryCount |
| download_skipped | downloadVideo() | videoId, reason (permanent failure) |
| circuit_tripped | Circuit Breaker | consecutiveErrors, reason |
| circuit_reset | Circuit Breaker | resetType (manual/auto) |
| batch_started | Batch Manager | batchId, batchNumber, videosTotal |
| batch_completed | Batch Manager | batchId, completed, failed |
| retry_scheduled | Retry Logic | videoId, retryCount, nextRetryAt, backoffMinutes |
| schedule_blocked | Schedule Checker | reason, nextWindowAt |
Key Implementation Details
- youtube_download_events table with JSONB details column
- Indexes on feed_item_id, event_type, and created_at for fast queries
- Best-effort logging (never throws, never blocks downloads)
- GET /api/youtube/download-history — paginated, filterable by event_type and date range
- Frontend timeline view with color-coded icons per event type
Task Breakdown
Acceptance Criteria Scorecard
Architecture: Complete Auto-Download System
Sprint Metrics
| Metric | Value |
|---|---|
| Tasks delivered | 15/15 (100%) |
| Acceptance criteria | 17/17 passing |
| Test count | 178 new/updated tests |
| Test pass rate | 100% (178/178) |
| TypeScript errors | 0 (backend clean) |
| New DB tables | 1 (youtube_download_events) |
| New DB columns | 2 (retry_count, next_retry_at) |
| New config entries | 2 (download_schedule, max_retry_attempts) |
| New API endpoints | 2 (download-history, batch/start-now) |
| New backend services | 3 (scheduleChecker, downloadEventLogger, retryManager) |
| Frontend sections added | 3 (retry badges, schedule picker, history timeline) |
| Team size | 10 roles + lead |
| Branch | feat/auto-download-phase345 |
Files Changed / Created
New Files
- supabase/migrations/20260215110000_youtube_retry_columns.sql
- supabase/migrations/20260215120000_youtube_download_events.sql
- backend/src/services/scheduleChecker.ts
- backend/src/services/downloadEventLogger.ts
- backend/src/services/__tests__/scheduleChecker.unit.test.ts
- backend/src/services/__tests__/downloadEventLogger.unit.test.ts
- backend/src/services/__tests__/retryLogic.unit.test.ts
- backend/src/services/__tests__/downloadHistory.unit.test.ts
Modified Files
- backend/src/config/registry.ts — download_schedule + max_retry_attempts config
- backend/src/services/batchDownloadManager.ts — schedule + retry integration
- backend/src/services/youtubeMonitorService.ts — retry logic in downloadVideo, retry-eligible query
- backend/src/services/downloadCircuitBreaker.ts — event logging on trip/reset
- backend/src/services/autoSyncService.ts — schedule check before batch
- backend/src/api/youtube/routes.ts — download-history + batch/start-now endpoints
- backend/src/storage/youtubeMonitorRepository.ts — retry query, history query
- frontend/src/pages/operator/YouTubeMonitor.tsx — retry badges, schedule UI, history timeline
- shared/types/youtubeFeed.ts — retry_count, next_retry_at fields
- docs/operations/auto-download-runbook.md — sections 7-9 added
PRFAQ
Press Release
FC-26 Auto-Download System Now Retries Intelligently, Respects Your Schedule, and Remembers Everything
The FC-26 video analysis platform today announces the completion of its auto-download system with three major capabilities: smart retry, download scheduling, and a comprehensive audit trail.
Smart Retry automatically recovers from transient download failures using exponential backoff (15 minutes, 1 hour, 4 hours). Operators no longer need to manually retry network-related failures — the system handles them autonomously while respecting a configurable maximum of 3 attempts.
Download Schedule lets operators configure off-peak download windows (default: 22:00–08:00) so that large video downloads don't compete with daytime internet usage. An override button provides immediate downloads when needed.
Audit & History logs every download lifecycle event to a queryable database with a visual timeline in the operator dashboard. Operators can now answer "what happened overnight?" with a single glance.
Frequently Asked Questions
New API Endpoints
| Method | Endpoint | Auth | Purpose |
|---|---|---|---|
| GET | /api/youtube/download-history | User | Paginated download event history |
| POST | /api/youtube/batch/start-now | Operator | Start batch ignoring schedule |
GET /api/youtube/download-history
Query params: page (default 1), limit (default 50, max 200), event_type, from (ISO date), to (ISO date)
{
"data": [
{
"id": "uuid",
"feed_item_id": "uuid",
"event_type": "download_completed",
"details": { "videoId": "abc123", "title": "Match 5" },
"created_at": "2026-02-15T22:30:00Z"
}
],
"meta": { "total": 142, "page": 1, "limit": 50, "totalPages": 3 }
}