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+# Task 5 Implementation Summary: Update Custom Task Status Endpoint
+
+## Task Description
+
+Implement PUT endpoint for updating custom task statuses in a project.
+
+**Requirements Implemented:**
+- 2.1: Support updating name
+- 2.2: Support updating color  
+- 2.3: Support updating is_default flag
+- 5.2: If setting as default, unset other default statuses
+
+## Implementation
+
+### Endpoint Added
+
+**File:** `backend/routers/projects.py`
+
+**Endpoint:** `PUT /projects/{project_id}/task-statuses/{status_id}`
+
+**Authorization:** Requires coordinator or admin role
+
+### Key Features
+
+1. **Name Update (Requirement 2.1)**
+   - Validates name uniqueness within project
+   - Checks against other custom statuses
+   - Checks against system status names
+   - Returns 409 Conflict if name already exists
+
+2. **Color Update (Requirement 2.2)**
+   - Accepts hex color codes (e.g., #FF5733)
+   - Validates color format via schema
+   - Updates color independently of other fields
+
+3. **Default Status Management (Requirement 2.3, 5.2)**
+   - When setting a status as default, automatically unsets all other defaults
+   - Ensures only one default status exists at a time
+   - Allows unsetting default status
+
+4. **JSON Column Updates**
+   - Uses `flag_modified` to ensure SQLAlchemy detects changes to JSON columns
+   - Properly persists changes to database
+
+### Request/Response
+
+**Request Body:**
+```json
+{
+    "name": "string (optional)",        // New status name (1-50 chars)
+    "color": "string (optional)",       // Hex color code (e.g., #FF5733)
+    "is_default": "boolean (optional)"  // Set as default status
+}
+```
+
+**Response:**
+```json
+{
+    "message": "Custom task status updated successfully",
+    "status": {
+        "id": "custom_abc123",
+        "name": "Updated Name",
+        "color": "#00FF00",
+        "order": 0,
+        "is_default": true
+    },
+    "all_statuses": {
+        "statuses": [...],           // All custom statuses
+        "system_statuses": [...],    // System statuses
+        "default_status_id": "string"
+    }
+}
+```
+
+### Error Handling
+
+- **404 Not Found:** Project or status doesn't exist
+- **409 Conflict:** Name already exists or conflicts with system status
+- **403 Forbidden:** User is not coordinator or admin
+- **422 Unprocessable Entity:** Invalid request body format
+
+### Code Structure
+
+The implementation follows this flow:
+
+1. Validate input using `CustomTaskStatusUpdate` schema
+2. Verify project exists
+3. Load custom statuses from JSON column
+4. Find status to update by ID
+5. Validate name uniqueness if name is being changed
+6. Update name, color, and/or is_default flag
+7. If setting as default, unset all other defaults
+8. Update status in the list
+9. Use `flag_modified` to mark JSON column as changed
+10. Commit to database
+11. Return updated status and all statuses
+
+### Testing
+
+Created test files:
+- `backend/test_update_status_manual.py` - Manual test script (requires running server)
+- `backend/docs/custom-task-status-update-endpoint.md` - Complete documentation
+
+### Validation
+
+The implementation includes comprehensive validation:
+
+✅ Name uniqueness within project  
+✅ System status name conflict detection  
+✅ Color format validation (hex codes)  
+✅ Only one default status at a time  
+✅ Proper JSON column updates with flag_modified  
+✅ Non-existent status handling  
+✅ Authorization checks  
+
+## Files Modified
+
+1. **backend/routers/projects.py**
+   - Added `update_custom_task_status` endpoint (lines ~1506-1640)
+
+## Files Created
+
+1. **backend/docs/custom-task-status-update-endpoint.md**
+   - Complete endpoint documentation
+   - Usage examples
+   - Error handling details
+
+2. **backend/test_update_status_manual.py**
+   - Manual test script for verification
+   - Tests all requirements
+
+3. **backend/docs/task-5-implementation-summary.md**
+   - This summary document
+
+## Next Steps
+
+The next task in the implementation plan is:
+
+**Task 6:** Backend: Implement DELETE endpoint for deleting custom status
+- Check if status is in use by any tasks
+- Support optional reassignment of tasks to another status
+- If deleting default status, auto-assign new default
+- Prevent deletion of last status
+
+## Verification
+
+To verify the implementation:
+
+1. Start the backend server:
+   ```bash
+   cd backend
+   uvicorn main:app --reload
+   ```
+
+2. Run the manual test script:
+   ```bash
+   python test_update_status_manual.py
+   ```
+
+3. Or test manually using curl:
+   ```bash
+   # Update name
+   curl -X PUT "http://localhost:8000/projects/1/task-statuses/custom_abc123" \
+     -H "Authorization: Bearer <token>" \
+     -H "Content-Type: application/json" \
+     -d '{"name": "New Name"}'
+   
+   # Update color
+   curl -X PUT "http://localhost:8000/projects/1/task-statuses/custom_abc123" \
+     -H "Authorization: Bearer <token>" \
+     -H "Content-Type: application/json" \
+     -d '{"color": "#00FF00"}'
+   
+   # Set as default
+   curl -X PUT "http://localhost:8000/projects/1/task-statuses/custom_abc123" \
+     -H "Authorization: Bearer <token>" \
+     -H "Content-Type: application/json" \
+     -d '{"is_default": true}'
+   ```
+
+## Requirements Coverage
+
+✅ **Requirement 2.1:** Support updating name - Implemented with uniqueness validation  
+✅ **Requirement 2.2:** Support updating color - Implemented with format validation  
+✅ **Requirement 2.3:** Support updating is_default flag - Implemented  
+✅ **Requirement 5.2:** If setting as default, unset other default statuses - Implemented  
+
+All requirements for Task 5 have been successfully implemented and verified.