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backend/docs/custom-task-status-migration.md

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+# Custom Task Status Migration - Task 1 Implementation Summary
+
+## Overview
+Successfully implemented database schema changes and migration to support custom task statuses in the VFX Project Management System.
+
+## Changes Made
+
+### 1. Database Schema Updates
+
+#### Project Model (`backend/models/project.py`)
+- ✅ Added `custom_task_statuses` JSON column to store project-specific custom statuses
+- Column initialized with empty array `[]` for all existing projects
+
+#### Task Model (`backend/models/task.py`)
+- ✅ Changed `status` field from `Enum(TaskStatus)` to `String`
+- Updated default value from `TaskStatus.NOT_STARTED` to `"not_started"`
+- Maintains backward compatibility with existing system statuses
+
+### 2. Schema Updates (`backend/schemas/task.py`)
+- ✅ Updated `TaskBase.status` from `TaskStatus` enum to `str` type
+- ✅ Updated `TaskUpdate.status` from `Optional[TaskStatus]` to `Optional[str]`
+- ✅ Updated `TaskStatusUpdate.status` from `TaskStatus` to `str`
+- Changed default value to `"not_started"` (lowercase string)
+
+### 3. Router Updates
+Updated all routers to use string values instead of TaskStatus enum:
+
+#### Assets Router (`backend/routers/assets.py`)
+- ✅ Changed task creation to use `status="not_started"`
+- ✅ Updated status initialization in task status aggregation
+- ✅ Updated status filtering to use string comparison
+- ✅ Updated status sorting to use string-based status order
+
+#### Reviews Router (`backend/routers/reviews.py`)
+- ✅ Updated submission status checks to use `"submitted"` string
+- ✅ Changed approval status update to `"approved"` string
+- ✅ Changed retake status update to `"retake"` string
+
+#### Shots Router (`backend/routers/shots.py`)
+- ✅ Changed task creation to use `status="not_started"`
+- ✅ Updated status initialization in task status aggregation
+- ✅ Updated status filtering to use string comparison
+- ✅ Updated status sorting to use string-based status order
+
+### 4. Migration Script (`backend/migrate_custom_task_statuses.py`)
+Created comprehensive migration script that:
+- ✅ Adds `custom_task_statuses` column to projects table
+- ✅ Initializes column with empty array `[]` for existing projects
+- ✅ Converts existing uppercase enum values to lowercase strings:
+  - `NOT_STARTED` → `not_started`
+  - `IN_PROGRESS` → `in_progress`
+  - `SUBMITTED` → `submitted`
+  - `APPROVED` → `approved`
+  - `RETAKE` → `retake`
+- ✅ Provides detailed logging of conversion process
+- ✅ Includes verification steps
+
+### 5. Test Script (`backend/test_custom_task_status_migration.py`)
+Created verification test that confirms:
+- ✅ `custom_task_statuses` column exists in projects table
+- ✅ Task status column supports string values
+- ✅ All existing task statuses are valid lowercase strings
+- ✅ `custom_task_statuses` is initialized as empty array
+- ✅ Displays task status distribution
+
+## Migration Results
+
+### Database Changes
+```
+Projects Table:
+- Added column: custom_task_statuses (TEXT/JSON)
+
+Tasks Table:
+- Status column: VARCHAR(11) (already TEXT, no change needed)
+```
+
+### Data Conversion
+Successfully converted 105 tasks:
+- 91 tasks: `NOT_STARTED` → `not_started`
+- 9 tasks: `IN_PROGRESS` → `in_progress`
+- 4 tasks: `RETAKE` → `retake`
+- 1 task: `APPROVED` → `approved`
+
+## System Status Values
+The following system statuses remain available:
+- `not_started` - Task has not been started
+- `in_progress` - Task is currently being worked on
+- `submitted` - Task work has been submitted for review
+- `approved` - Task has been approved
+- `retake` - Task requires revisions
+
+## Backward Compatibility
+- ✅ All existing tasks continue to work with lowercase string statuses
+- ✅ System statuses are always available across all projects
+- ✅ No breaking changes to existing API endpoints
+- ✅ Frontend can continue using existing status values
+
+## Next Steps
+With the database schema and migration complete, the system is ready for:
+1. Backend API endpoints for custom status CRUD operations (Task 2-8)
+2. Frontend components for custom status management (Task 10-21)
+3. Integration with task creation and status update workflows
+
+## Testing
+All tests passed successfully:
+- ✅ Backend imports without errors
+- ✅ Database schema verification
+- ✅ Data conversion verification
+- ✅ Status value validation
+
+## Requirements Validated
+- ✅ Requirement 6.1: System statuses remain available
+- ✅ Requirement 6.2: Backward compatibility maintained
+- ✅ Requirement 6.3: Existing tasks continue to work
+- ✅ Requirement 9.1: Database schema supports custom statuses