refactor: replace issues backend with milestone tasks

app/services/monitoring.py

@@ -5,7 +5,7 @@ from typing import Any, Dict, Tuple
 import requests
 from sqlalchemy.orm import Session
 
-from app.models.models import Issue
+from app.models.task import Task, TaskStatus
 from app.models.monitor import ProviderAccount, ProviderUsageSnapshot, MonitoredServer, ServerState
 
 _CACHE: Dict[str, Dict[str, Any]] = {}
@@ -70,25 +70,25 @@ def _normalize_usage_payload(payload: Dict[str, Any]) -> Dict[str, Any]:
     }
 
 
-def get_issue_stats_cached(db: Session, ttl_seconds: int = 1800):
-    key = 'issue_stats_24h'
+def get_task_stats_cached(db: Session, ttl_seconds: int = 1800):
+    key = 'task_stats_24h'
     now = _now()
     hit = _CACHE.get(key)
     if hit and (now - hit['at']).total_seconds() < ttl_seconds:
         return hit['data']
 
     since = now - timedelta(hours=24)
-    total = db.query(Issue).count()
-    new_24h = db.query(Issue).filter(Issue.created_at >= since).count()
-    processed_24h = db.query(Issue).filter(
-        Issue.updated_at != None,
-        Issue.updated_at >= since,
-        Issue.status.in_(['resolved', 'closed'])
+    total = db.query(Task).count()
+    new_24h = db.query(Task).filter(Task.created_at >= since).count()
+    processed_24h = db.query(Task).filter(
+        Task.updated_at != None,
+        Task.updated_at >= since,
+        Task.status == TaskStatus.CLOSED,
     ).count()
     data = {
-        'total_issues': total,
-        'new_issues_24h': new_24h,
-        'processed_issues_24h': processed_24h,
+        'total_tasks': total,
+        'new_tasks_24h': new_24h,
+        'processed_tasks_24h': processed_24h,
         'computed_at': now.isoformat(),
         'cache_ttl_seconds': ttl_seconds,
     }