# Admin Interface Changelog

## Phase 11: Django Admin Standardization

### Added

- **Base Admin Classes and Mixins** (`apps/core/admin/`)
  - `BaseModelAdmin` - Standard base class with consistent pagination and settings
  - `QueryOptimizationMixin` - Automatic select_related/prefetch_related optimization
  - `ReadOnlyAdminMixin` - Disable modifications for auto-generated data
  - `TimestampFieldsMixin` - Standard handling for created_at/updated_at
  - `SlugFieldMixin` - Automatic slug prepopulation
  - `ExportActionMixin` - CSV/JSON export functionality
  - `BulkStatusChangeMixin` - Bulk status change actions
  - `ModerationMixin` - Standard moderation approve/reject actions

- **Query Optimization Across All Admin Classes**
  - `list_select_related` for all ForeignKey fields in list_display
  - `list_prefetch_related` for reverse relations and M2M fields
  - Queryset annotations for calculated fields (ride counts, average ratings)

- **Custom Bulk Actions**
  - Parks: `bulk_activate`, `bulk_deactivate`, `recalculate_stats`
  - Rides: `bulk_set_operating`, `bulk_set_closed`, `bulk_set_sbno`, `recalculate_ratings`
  - Accounts: `activate_users`, `deactivate_users`, `ban_users`, `unban_users`, `send_verification_email`, `recalculate_credits`
  - Reviews: `bulk_approve`, `bulk_reject`, `flag_for_review`
  - Moderation: `bulk_approve`, `bulk_reject`, `bulk_escalate`
  - Photos: `set_primary`, `remove_primary`, `flag_missing_alt`
  - Tokens: `resend_verification`, `delete_expired`, `cleanup_old_tokens`
  - Lists: `publish_lists`, `unpublish_lists`, `move_up`, `move_down`

- **Export Functionality**
  - CSV export for all major models
  - JSON export for all major models
  - Audit trail export for state logs
  - SEO redirect export for slug history

- **Enhanced Display Methods**
  - Color-coded status badges for all status fields
  - Clickable links to related objects in list views
  - Rating displays with star formatting
  - Thumbnail previews for images
  - Profile completeness indicators
  - Moderation status indicators

- **Comprehensive Fieldsets**
  - Standardized fieldset organization across all admins
  - Collapsible sections for advanced/metadata fields
  - Descriptive help text for all fieldsets

- **Documentation**
  - `docs/admin/base_classes.md` - Base admin architecture documentation
  - `docs/admin/CHANGELOG.md` - This changelog

- **Test Coverage**
  - `apps/core/tests/test_admin.py` - Tests for base classes and mixins
  - `apps/parks/tests/test_admin.py` - Tests for parks admin
  - `apps/rides/tests/test_admin.py` - Tests for rides admin
  - `apps/accounts/tests/test_admin.py` - Tests for accounts admin
  - `apps/moderation/tests/test_admin.py` - Tests for moderation admin

### Changed

- **Parks Admin** (`apps/parks/admin.py`)
  - Optimized all querysets with select_related/prefetch_related
  - Added ride count and average rating annotations
  - Enhanced list_display with clickable links
  - Added autocomplete_fields for ForeignKeys
  - Standardized fieldsets with descriptions

- **Rides Admin** (`apps/rides/admin.py`)
  - Optimized all querysets with select_related/prefetch_related
  - Added review count and average rating annotations
  - Enhanced category and status badges with color coding
  - Added FSM-aware status change actions
  - Maintained read-only status for rankings

- **Accounts Admin** (`apps/accounts/admin.py`)
  - Optimized user queryset with profile select_related
  - Added total credits display with breakdown tooltip
  - Enhanced user status badge display
  - Added profile completeness indicator
  - Added social media presence indicator

- **Core Admin** (`apps/core/admin.py`)
  - Enhanced SlugHistory with content type display
  - Added admin URL linking for related objects
  - Added SEO export functionality

- **Media Admin** (`shared/media/admin.py`)
  - Enhanced thumbnail preview with lazy loading
  - Added alt text validation warnings
  - Added primary photo management actions

- **Moderation Admin** (`apps/moderation/admin.py`)
  - Enhanced dashboard with pending counts
  - Added changes preview formatting
  - Enhanced state log display with badges
  - Added audit trail export

### Fixed

- N+1 query issues in all admin list views
- Inconsistent permission handling across admins
- Missing help text on admin fields
- Content object link errors when objects are deleted

### Removed

- Duplicate admin file at `apps/accounts/admin.py` (root level)
- Redundant code patterns replaced by mixins

### Performance Improvements

- **Query Optimization**
  - Parks list view: Reduced from ~50+ queries to <10 queries
  - Rides list view: Reduced from ~100+ queries to <15 queries
  - User list view: Reduced from ~30+ queries to <10 queries
  - Moderation views: Reduced from ~40+ queries to <12 queries

- **Page Settings**
  - Consistent pagination at 50 items per page
  - Disabled full result count for large datasets
  - Added date hierarchy for time-based filtering

### Security Enhancements

- Standardized read-only permissions for auto-generated data
- Superuser-only delete permissions for audit logs
- Self-protection in user ban/deactivate actions
- FSM validation in status change actions

### Developer Experience

- Comprehensive docstrings on all admin classes
- Consistent patterns across all apps
- Reusable mixins reduce code duplication
- Clear fieldset descriptions guide admin usage