# Shot Project ID Soft Deletion Service Update

## Overview

This document describes the updates made to the soft deletion services to ensure `project_id` is properly preserved during soft deletion and recovery operations for shots.

## Changes Made

### 1. Shot Soft Deletion Service (`backend/services/shot_soft_deletion.py`)

#### DeletionInfo Class Updates
- **Added `project_id` field**: The `DeletionInfo` class now includes a `project_id` field to store the project ID of the shot being deleted.
- **Updated initialization**: The `get_deletion_info` method now populates `project_id` directly from `shot.project_id` instead of deriving it from the episode relationship.

#### Activity Logging Updates
- **Direct project_id usage**: The `_log_shot_deletion` method now uses `shot.project_id` directly for the activity's `project_id` field.
- **Enhanced metadata**: Added `project_id` and `project_name` to the activity metadata for better tracking.

### 2. Recovery Service (`backend/services/recovery_service.py`)

#### DeletedShot Class Updates
- **Added `project_id` field**: The `DeletedShot` class now includes a `project_id` field for consistency.

#### RecoveryInfo Class Updates
- **Added `project_id` field**: The `RecoveryInfo` class now includes a `project_id` field to track project information during recovery operations.

#### Service Method Updates
- **Updated `get_deleted_shots`**: Now populates `project_id` directly from `shot.project_id`.
- **Updated `preview_shot_recovery`**: Now includes `project_id` in the recovery information.
- **Updated `_log_shot_recovery`**: Uses `shot.project_id` directly and includes project information in activity metadata.

### 3. Admin Router (`backend/routers/admin.py`)

#### API Response Updates
- **Enhanced deleted shots endpoint**: The `/admin/deleted-shots/` endpoint now includes `project_id` in the response.
- **Enhanced recovery preview endpoint**: The `/admin/shots/{shot_id}/recovery-preview` endpoint now includes `project_id` in the response.

## Key Benefits

### 1. Data Integrity
- **Direct relationship**: Using `shot.project_id` directly ensures data integrity and eliminates dependency on episode relationships for project identification.
- **Consistent tracking**: Project information is consistently preserved throughout the soft deletion and recovery lifecycle.

### 2. Performance Improvement
- **Reduced joins**: Direct access to `project_id` reduces the need for complex joins through episode relationships.
- **Faster queries**: Project filtering can now use direct `project_id` comparisons.

### 3. API Enhancement
- **Complete information**: API responses now include both `project_id` and `project_name` for better frontend integration.
- **Filtering support**: The existing project filtering functionality now works more efficiently with direct `project_id` access.

## Backward Compatibility

All changes maintain backward compatibility:
- Existing API endpoints continue to work as before
- Additional fields are added without removing existing functionality
- Episode relationships are still maintained and used where appropriate

## Testing

### Test Coverage
- **Unit tests**: Existing soft deletion service tests continue to pass
- **Integration tests**: New tests verify `project_id` preservation throughout the deletion/recovery cycle
- **API tests**: Tests verify that API endpoints return `project_id` information correctly

### Test Files Created
1. `test_project_id_preservation_simple.py` - Tests core `project_id` preservation functionality
2. `test_admin_api_project_id.py` - Tests API endpoint responses (requires running server)

## Requirements Validation

This implementation satisfies the following requirements from the specification:

### Requirement 4.5
> "WHEN soft deleting shots, THE VFX_System SHALL preserve project_id information for recovery operations"

**✅ Satisfied**: 
- `project_id` is preserved in the shot record during soft deletion
- Recovery operations maintain `project_id` consistency
- All related data maintains project relationships

### Additional Benefits
- **Enhanced logging**: Activity logs now include complete project information
- **Improved debugging**: Project context is available in all deletion/recovery operations
- **Better admin tools**: Admin interfaces have access to project information for better management

## Migration Notes

No database migration is required for these changes as they work with the existing `project_id` column that was added in the previous migration. The changes are purely at the service and API layer to ensure proper utilization of the existing `project_id` field.

## Future Enhancements

Potential future improvements could include:
- Adding project-specific deletion policies
- Enhanced project-based recovery filtering
- Project-scoped deletion statistics and reporting