Ruff auto-fix: unused Optional imports in sectors router and link
schemas, unused Site import in device service, unused datetime
imports in trend detector, unused text import in site service,
and f-string without placeholders in signal history service.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Create signal_history_service with TimescaleDB time_bucket queries for 24h/7d/30d ranges
- Create site_alert_service with full CRUD for rules, events list/resolve, and active count
- Create signal_history router with GET endpoint for time-bucketed signal data
- Create site_alerts router with CRUD endpoints for rules and event management
- Wire both routers into main.py with /api prefix
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
