1. schedule_runner.py: cron-based schedule execution every 60s
- Parses 5-field cron expressions (*, */N, ranges, lists)
- Triggers SyncEngineV2.sync_files for due schedules
- Prevents re-trigger within same minute
2. retry_runner.py: automatic retry of failed pushes every 5min
- Exponential backoff (60s base, doubles per retry, max 64x)
- Respects max_retries from PushRetryJob model
3. GET /api/servers/stats: dashboard aggregation endpoint
- Returns total/online/offline counts + category breakdown
- Reads real-time status from Redis, falls back to MySQL
- Registered before /{id} to avoid path collision
4. main.py: register schedule_runner + retry_runner as background tasks
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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