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# Task 8: Backend Task Endpoints Custom Status Support
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## Overview
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This implementation adds support for custom task statuses to all task-related endpoints in the backend. The system now validates statuses against both system statuses and project-specific custom statuses, ensuring proper status resolution across project boundaries.
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## Changes Made
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### 1. Added Helper Functions (`backend/routers/tasks.py`)
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#### `get_project_default_status(db: Session, project_id: int) -> str`
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- Retrieves the default status for a project
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- Checks for custom statuses with `is_default=True` flag
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- Falls back to system default "not_started" if no custom default is set
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- Handles JSON parsing for custom_task_statuses field
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#### `validate_task_status(db: Session, project_id: int, status_value: str) -> bool`
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- Validates that a status exists for a specific project
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- Checks system statuses first (not_started, in_progress, submitted, approved, retake)
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- Then checks project-specific custom statuses
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- Returns True if valid, False otherwise
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- Ensures status isolation between projects
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### 2. Updated Task Creation Endpoint
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**Endpoint**: `POST /tasks/`
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**Changes**:
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- Uses `get_project_default_status()` when no status is specified
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- Validates provided status using `validate_task_status()`
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- Returns 400 error if invalid status is provided
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- Maintains backward compatibility with system statuses
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**Example**:
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```python
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# Use default status if not specified
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task_data = task.model_dump()
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if not task_data.get('status') or task_data['status'] == 'not_started':
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task_data['status'] = get_project_default_status(db, task.project_id)
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else:
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# Validate the provided status
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if not validate_task_status(db, task.project_id, task_data['status']):
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raise HTTPException(
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status_code=400,
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detail=f"Invalid status '{task_data['status']}' for this project"
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)
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```
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### 3. Updated Task Status Update Endpoint
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**Endpoint**: `PUT /tasks/{task_id}/status`
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**Changes**:
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- Validates new status against project's available statuses
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- Returns 400 error if status is invalid for the task's project
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- Supports both system and custom statuses
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**Example**:
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```python
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# Validate the status for the task's project
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if not validate_task_status(db, task.project_id, status_update.status):
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raise HTTPException(
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status_code=400,
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detail=f"Invalid status '{status_update.status}' for this project"
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)
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```
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### 4. Updated Task Update Endpoint
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**Endpoint**: `PUT /tasks/{task_id}`
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**Changes**:
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- Validates status field if it's being updated
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- Checks status validity before applying update
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- Maintains existing permission checks
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### 5. Updated Bulk Status Update Endpoint
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**Endpoint**: `PUT /tasks/bulk/status`
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**Changes**:
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- Validates status for each task's project before updating
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- Ensures atomic updates - all tasks succeed or all fail
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- Provides detailed error messages for invalid statuses
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- Handles tasks from different projects correctly
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**Example**:
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```python
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# Validate status for the task's project
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if not validate_task_status(db, task.project_id, bulk_update.status):
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errors.append({
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"task_id": task_id,
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"error": f"Invalid status '{bulk_update.status}' for task's project"
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})
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failed_count += 1
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continue
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```
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## Requirements Addressed
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### Requirement 5.3: Default Status for New Tasks
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✅ Task creation uses project's default status when not specified
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✅ Falls back to system default "not_started" for projects without custom statuses
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### Requirement 6.4: Backward Compatibility
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✅ System statuses (not_started, in_progress, submitted, approved, retake) remain valid for all projects
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✅ Existing tasks with system statuses continue to work
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### Requirement 6.5: Status Resolution
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✅ Status validation checks both system and custom statuses
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✅ Custom statuses are project-specific and don't leak between projects
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### Requirement 10.1: Bulk Status Update Validation
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✅ Bulk updates validate status for each task's project
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✅ Atomic updates ensure consistency
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### Requirement 10.2: Cross-Project Handling
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✅ Tasks from different projects can be updated in bulk
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✅ Each task's status is validated against its own project's statuses
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## Testing
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### Test Coverage
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Created comprehensive test suite (`backend/test_task_custom_status_support.py`) covering:
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1. **Task Creation with Default Status**
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- ✅ Default status correctly identified from custom statuses
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- ✅ Tasks created without explicit status use project default
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- ✅ Tasks can be created with explicit custom status
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2. **Status Validation**
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- ✅ All system statuses validated successfully
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- ✅ Custom statuses validated for their project
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- ✅ Invalid statuses correctly rejected
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3. **Status Resolution Across Projects**
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- ✅ Project 1 custom statuses rejected for Project 2
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- ✅ Project 2 custom statuses rejected for Project 1
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- ✅ System statuses valid for all projects
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- ✅ Each project has its own default status
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4. **Bulk Status Update Validation**
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- ✅ Status validated for each task's project
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- ✅ System statuses valid for all tasks
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- ✅ Custom statuses only valid for their project
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5. **Projects Without Custom Statuses**
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- ✅ Use system default "not_started"
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- ✅ System statuses remain valid
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- ✅ Custom statuses from other projects rejected
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### Test Results
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```
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============================================================
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Testing Task Endpoints Custom Status Support
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============================================================
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=== Test 1: Task Creation with Default Status ===
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✓ Default status correctly identified: custom_todo
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✓ Task created with default status: custom_todo
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✓ Task created with explicit custom status: custom_doing
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✓ Test 1 PASSED
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=== Test 2: Status Validation ===
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✓ All system statuses validated successfully
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✓ All custom statuses validated successfully
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✓ Invalid statuses correctly rejected
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✓ Test 2 PASSED
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=== Test 3: Status Resolution Across Projects ===
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✓ Project 1 custom status correctly rejected for Project 2
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✓ Project 2 custom status correctly rejected for Project 1
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✓ System statuses valid for both projects
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✓ Project 1 default: custom_todo, Project 2 default: project2_status
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✓ Test 3 PASSED
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=== Test 4: Bulk Status Update Validation ===
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✓ Validated 2 tasks from Project 1
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✓ Validated 0 tasks from Project 2
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✓ System statuses valid for all 2 tasks
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✓ Test 4 PASSED
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=== Test 5: Project Without Custom Statuses ===
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✓ Project without custom statuses uses system default: not_started
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✓ System statuses valid for project without custom statuses
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✓ Custom statuses from other projects correctly rejected
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✓ Test 5 PASSED
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============================================================
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✓ ALL TESTS PASSED
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============================================================
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```
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## API Behavior
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### Task Creation
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```json
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POST /tasks/
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{
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"project_id": 1,
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"name": "New Task",
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"task_type": "modeling",
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// status not specified - will use project default
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}
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```
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### Task Status Update
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```json
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PUT /tasks/123/status
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{
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"status": "custom_todo" // Must be valid for task's project
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}
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```
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### Bulk Status Update
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```json
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PUT /tasks/bulk/status
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{
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"task_ids": [1, 2, 3],
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"status": "custom_doing" // Validated for each task's project
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}
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```
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## Error Handling
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### Invalid Status Error
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```json
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{
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"detail": "Invalid status 'custom_nonexistent' for this project"
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}
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```
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### Bulk Update Errors
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```json
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{
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"success_count": 2,
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"failed_count": 1,
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"errors": [
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{
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"task_id": 3,
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"error": "Invalid status 'custom_todo' for task's project"
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}
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]
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}
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```
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## Database Schema
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No database changes required. The implementation uses existing fields:
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- `projects.custom_task_statuses` (JSON) - stores custom statuses
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- `tasks.status` (String) - stores status value
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## Backward Compatibility
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✅ **Fully backward compatible**
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- Existing tasks with system statuses continue to work
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- Projects without custom statuses use system defaults
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- System statuses remain valid for all projects
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- No migration required
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## Next Steps
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The frontend components should be updated to:
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1. Fetch custom statuses from `/projects/{id}/task-statuses` endpoint
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2. Display custom status colors in UI
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3. Use custom statuses in status dropdowns and filters
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4. Handle validation errors from backend
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## Related Files
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- `backend/routers/tasks.py` - Main implementation
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- `backend/routers/projects.py` - Custom status management endpoints
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- `backend/models/task.py` - Task model (status field is String)
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- `backend/models/project.py` - Project model (custom_task_statuses field)
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- `backend/test_task_custom_status_support.py` - Test suite
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