feat: Complete data cleaning workflow with bidirectional relationship management

docs/testing.md

@@ -201,14 +201,14 @@ Stable hooks are provided via `data-testid` attributes on key elements:
 - Header/nav/main in `scidk/ui/templates/base.html`:
   - `data-testid="header"` - Main header element
   - `data-testid="nav"` - Navigation container
-  - `data-testid="nav-home"` - Home link
+  - `data-testid="nav-home"` - Home/Settings link (landing page)
   - `data-testid="nav-files"` - Files link
   - `data-testid="nav-maps"` - Maps link
   - `data-testid="nav-chats"` - Chats link
   - `data-testid="nav-settings"` - Settings link
   - `data-testid="main"` - Main content area
-- Home page in `scidk/ui/templates/index.html`:
-  - `data-testid="home-recent-scans"` - Recent scans section
+- Settings page (landing page) in `scidk/ui/templates/index.html`:
+  - Settings sections with various configuration options
 - Files page in `scidk/ui/templates/datasets.html`:
   - `data-testid="files-root"` - Root container
   - `data-testid="files-title"` - Page title
@@ -272,7 +272,7 @@ New API contracts added under `tests/contracts/test_api_contracts.py`:
 
 New Playwright specs:
 - `e2e/browse.spec.ts`: navigates to Files and verifies stable hooks, no console errors
-- `e2e/scan.spec.ts`: posts `/api/scan` for a temp directory and verifies the Home page lists it
+- `e2e/scan.spec.ts`: posts `/api/scan` for a temp directory and verifies scan completion
 
 ### How to Run New Tests
 

scidk/services/label_service.py

@@ -713,3 +713,59 @@ def update_label_instance(self, name: str, instance_id: str, property_name: str,
                 'status': 'error',
                 'error': str(e)
             }
+
+    def overwrite_label_instance(self, name: str, instance_id: str, properties: Dict[str, Any]) -> Dict[str, Any]:
+        """
+        Overwrite all properties of a label instance in Neo4j.
+        This removes any properties not in the provided dictionary.
+
+        Args:
+            name: Label name
+            instance_id: Neo4j element ID
+            properties: Complete set of properties to set (removes all others)
+
+        Returns:
+            Dict with status and updated instance
+        """
+        label_def = self.get_label(name)
+        if not label_def:
+            raise ValueError(f"Label '{name}' not found")
+
+        try:
+            from .neo4j_client import get_neo4j_client
+            neo4j_client = get_neo4j_client()
+
+            if not neo4j_client:
+                raise Exception("Neo4j client not configured")
+
+            # Use SET n = {properties} to overwrite all properties
+            # This removes any properties not in the provided dict
+            query = f"""
+            MATCH (n:{name})
+            WHERE elementId(n) = $instance_id
+            SET n = $properties
+            RETURN elementId(n) as id, properties(n) as properties
+            """
+
+            results = neo4j_client.execute_write(query, {
+                'instance_id': instance_id,
+                'properties': properties
+            })
+
+            if not results:
+                raise Exception(f"Instance with ID '{instance_id}' not found")
+
+            instance = {
+                'id': results[0].get('id'),
+                'properties': results[0].get('properties', {})
+            }
+
+            return {
+                'status': 'success',
+                'instance': instance
+            }
+        except Exception as e:
+            return {
+                'status': 'error',
+                'error': str(e)
+            }