added stats endpoint for dashboards

backend/main.py

@@ -1499,6 +1499,67 @@ async def toggle_plugin(request: Request, plugin_name: str, enabled: dict):
         raise HTTPException(status_code=500, detail=safe_error_message(e, "Failed to toggle plugin"))
 
 
+# ============================================================================
+# Stats Endpoint (for dashboards)
+# ============================================================================
+
+@api_router.get("/stats", tags=["Stats"])
+@limiter.limit("30/minute")
+async def get_stats(request: Request):
+    """
+    Get application statistics at a glance.
+
+    Designed for dashboard widgets (e.g., Homepage) - lightweight and cached.
+    Returns counts of notes, folders, tags, templates, media, and other metadata.
+    """
+    try:
+        notes_dir = config['storage']['notes_dir']
+        
+        # Get notes and folders (cached)
+        notes, folders = scan_notes_fast_walk(notes_dir, include_media=True)
+        
+        # Separate notes from media
+        note_items = [n for n in notes if n.get('type') == 'note']
+        media_items = [n for n in notes if n.get('type') != 'note']
+        
+        # Count unique tags
+        all_tags = set()
+        for note in note_items:
+            all_tags.update(note.get('tags', []))
+        
+        # Get templates count
+        templates = get_templates(notes_dir)
+        
+        # Calculate total size
+        total_size = sum(n.get('size', 0) for n in notes)
+        
+        # Get last modified (notes are already sorted by modified desc)
+        last_modified = note_items[0].get('modified') if note_items else None
+        
+        # Count enabled plugins
+        enabled_plugins = sum(1 for p in plugin_manager.plugins.values() if p.enabled)
+        
+        # Read version
+        version = "unknown"
+        version_file = Path(__file__).parent.parent / "VERSION"
+        if version_file.exists():
+            version = version_file.read_text().strip()
+        
+        return {
+            "notes_count": len(note_items),
+            "folders_count": len(folders),
+            "tags_count": len(all_tags),
+            "templates_count": len(templates),
+            "media_count": len(media_items),
+            "total_size_bytes": total_size,
+            "last_modified": last_modified,
+            "plugins_enabled": enabled_plugins,
+            "version": version
+        }
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=safe_error_message(e, "Failed to get stats"))
+
+
 # ============================================================================
 # Share Token Endpoints (authenticated)
 # ============================================================================

documentation/API.md

@@ -452,6 +452,60 @@ GET /api/config
 ```
 Returns application configuration.
 
+### Get Stats
+```http
+GET /api/stats
+```
+Returns application statistics at a glance. Designed for dashboard widgets (e.g., Homepage) - lightweight and uses cached data.
+
+**Response:**
+```json
+{
+  "notes_count": 142,
+  "folders_count": 12,
+  "tags_count": 37,
+  "templates_count": 5,
+  "media_count": 23,
+  "total_size_bytes": 2458624,
+  "last_modified": "2026-03-17T14:32:00Z",
+  "plugins_enabled": 3,
+  "version": "0.19.1"
+}
+```
+
+| Field | Description |
+|-------|-------------|
+| `notes_count` | Total number of markdown notes |
+| `folders_count` | Total number of folders |
+| `tags_count` | Number of unique tags across all notes |
+| `templates_count` | Number of templates in `_templates` folder |
+| `media_count` | Number of media files (images, etc.) |
+| `total_size_bytes` | Total size of all files in bytes |
+| `last_modified` | ISO timestamp of most recently modified note |
+| `plugins_enabled` | Number of enabled plugins |
+| `version` | Application version |
+
+**Example ([Homepage](https://gethomepage.dev/) dashboard widget):**
+```yaml
+- NoteDiscovery:
+    href: https://notediscovery.homelab.local
+    icon: notediscovery
+    container: homelab-notediscovery
+    widget:
+      type: customapi
+      url: http://notediscovery:8000/api/stats
+      refreshInterval: 60000
+      mappings:
+        - field: notes_count
+          label: Notes
+        - field: tags_count
+          label: Tags
+        - field: folders_count
+          label: Folders
+        - field: version
+          label: Version
+```
+
 ### Health Check
 ```http
 GET /health