# Connections Dashboard with Background Health Checks

## Context

Users currently access Evotor connection via a dedicated `/evotor` page linked from the navbar. As more integrations are planned, we need a unified **Connections** page where users can see all their connections at a glance, with real-time status indicators powered by background health checks.

## Plan

### 1. Model Changes — `web/models.py`

Add to `EvotorConnection`:
- `is_online` (Boolean, default=False, server_default="0")
- `last_checked_at` (DateTime, nullable)

### 2. Alembic Migration

Generate migration for the two new columns on `evotor_connections` table.

### 3. Config Addition — `web/config.py`

Add `HEALTH_CHECK_INTERVAL_SECONDS: int = 600` (10 minutes default).

### 4. Background Health Checker — `web/health_checker.py` (new)

- `check_evotor_connection(access_token) -> bool` — async, calls `GET https://api.evotor.ru/stores` with Bearer token, returns True if 200
- `run_health_checks()` — queries all `EvotorConnection` rows using its own `SessionLocal()`, checks each, updates `is_online` and `last_checked_at`
- `health_check_loop(interval)` — infinite loop with `asyncio.sleep`, calls `run_health_checks()`

### 5. Wire Background Task — `web/main.py`

Add FastAPI lifespan context manager:
- On startup: `asyncio.create_task(health_check_loop(...))`
- On shutdown: cancel the task
- Register new connections router

### 6. Connections Route — `web/routes/connections.py` (new)

`GET /connections` — requires auth, builds a list of connection descriptors:
```python
connections = [{
    "name": "Эвотор",
    "icon": "bi-shop",
    "connected": bool,
    "is_online": bool,
    "last_checked_at": datetime | None,
    "details": store_name,
    "connect_url": "/evotor",
    "disconnect_url": "/evotor/disconnect",
}]
```
Future connections just append another dict — template stays generic.

### 7. Connections Template — `web/templates/connections.html` (new)

Card per connection showing:
- Icon + name + optional details (store name)
- Status: green `bi-circle-fill` (online), red `bi-circle-fill` (offline), grey `bi-circle` (not connected)
- Action button: "Подключить" (link to connect_url) or "Отключить" (POST form to disconnect_url)
- Card footer with last check timestamp

### 8. Navbar Update — `web/templates/base.html`

Replace "Эвотор" link with "Подключения" → `/connections`.

### 9. Evotor Callback Update — `web/routes/evotor.py`

On successful OAuth callback, set `is_online=True` and `last_checked_at=func.now()`.

### 10. Evotor Template Back Link — `web/templates/evotor.html`

Change "Вернуться в личный кабинет" → "Вернуться к подключениям" linking to `/connections`.

## Files Summary

| File | Action |
|------|--------|
| `web/models.py` | Modify — add 2 fields |
| `web/config.py` | Modify — add interval setting |
| `web/main.py` | Modify — lifespan + router |
| `web/routes/evotor.py` | Modify — set online on callback |
| `web/routes/connections.py` | Create |
| `web/health_checker.py` | Create |
| `web/templates/connections.html` | Create |
| `web/templates/base.html` | Modify — navbar |
| `web/templates/evotor.html` | Modify — back link |
| Alembic migration | Create |

## Verification

1. Run `alembic upgrade head` to apply migration
2. Start the app, verify background task logs appear
3. Visit `/connections` — should show Evotor as disconnected (grey)
4. Connect Evotor via `/evotor` — should redirect back, connections page shows green status
5. Disconnect — status returns to grey
6. Wait for health check interval or trigger manually — verify `is_online` and `last_checked_at` update