Fix db function calls and add missing functions

- Fix get_activities to use get_activities_paginated
- Add get_user_assets, delete_asset, count_users, count_user_activities
- Add get_user_activities, get_renderer, update_anchor, delete_anchor
- Add record_run and get_run functions
- Fix create_asset calls to use dict parameter
- Fix update_asset call signature

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/activities.py

@@ -31,8 +31,8 @@ async def list_activities(
 
     username = get_user_from_cookie(request)
 
-    activities = await db.get_activities(offset=offset, limit=limit)
-    has_more = len(activities) >= limit
+    activities, total = await db.get_activities_paginated(limit=limit, offset=offset)
+    has_more = offset + len(activities) < total
 
     if wants_json(request):
         return {"activities": activities, "offset": offset, "limit": limit}