Add comprehensive admin features and multi-system integration

- Add admin dashboard with sync controls and data browser
- Implement RMM, Auvik, and Addigy organization mappings
- Add chunked ticket sync with progress tracking
- Implement entity sync service with rate limiting
- Add analytics engine and performance optimizer
- Create data browser for all PSA entities
- Add navigation components and UI improvements
- Implement background processing and sync services
- Add comprehensive documentation and migration scripts
- Update configuration items with multi-system support
- Enhance contact management and purchase history
- Add issue type assignment and LLM analyzer
- Improve error handling and logging utilities

docs/TIME_ENTRIES_SORTING_FIX.md

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+# Time Entries Sorting Fix
+
+## Problem
+The sort buttons on the time entries data browser page were not working. Clicking column headers to sort had no effect.
+
+## Root Cause
+The `DataTable` component expects an `onSort` callback prop, but the time-entries page was not providing it.
+
+**Missing in original code:**
+```typescript
+<DataTable
+  data={timeEntries}
+  columns={columns}
+  // ... other props
+  // ❌ onSort prop was missing
+/>
+```
+
+## Solution
+
+### 1. Added Sort State
+```typescript
+// Sort states
+const [sortBy, setSortBy] = useState('entry_date');
+const [sortOrder, setSortOrder] = useState<'asc' | 'desc'>('desc');
+```
+
+### 2. Updated fetchTimeEntries to Include Sort Parameters
+```typescript
+params.append('sort_by', sortBy);
+params.append('sort_order', sortOrder);
+```
+
+### 3. Created handleSort Function
+```typescript
+const handleSort = async (column: string, direction: 'asc' | 'desc') => {
+  setSortBy(column);
+  setSortOrder(direction);
+  
+  // Fetch with new sort parameters
+  // ... builds params with new sort values
+  // Resets to page 1 when sorting changes
+};
+```
+
+### 4. Passed onSort to DataTable
+```typescript
+<DataTable
+  data={timeEntries}
+  columns={columns}
+  isLoading={loading}
+  onRowClick={handleRowClick}
+  totalCount={totalCount}
+  page={currentPage}
+  pageSize={pageSize}
+  onPageChange={handlePageChange}
+  onSort={handleSort} // ✅ Now provided
+/>
+```
+
+## How It Works
+
+1. **User clicks column header** → DataTable calls `onSort(columnKey, direction)`
+2. **handleSort updates state** → Sets `sortBy` and `sortOrder`
+3. **handleSort fetches data** → Calls API with `sort_by` and `sort_order` params
+4. **Page resets to 1** → Sorting always shows results from the first page
+5. **Table updates** → New sorted data is displayed
+
+## API Parameters
+
+The API endpoint `/api/data/time-entries` accepts:
+- `sort_by` - Column name to sort by (e.g., 'entry_date', 'hours_worked', 'resource_id')
+- `sort_order` - Sort direction: 'asc' or 'desc'
+
+**Valid sort columns:**
+- `entry_date`
+- `hours_worked`
+- `created_at`
+- `updated_at`
+- `resource_id`
+- `ticket_id`
+- `task_id`
+- `project_id`
+- `company_id`
+- `title`
+- `billable`
+- `approved`
+
+## Default Sorting
+- **Column**: `entry_date`
+- **Order**: `desc` (newest first)
+
+## User Experience
+
+### Before Fix
+- ❌ Clicking column headers did nothing
+- ❌ No visual feedback
+- ❌ Data remained in default order
+
+### After Fix
+- ✅ Clicking column headers sorts the data
+- ✅ Arrow icons show current sort direction
+- ✅ Data updates immediately
+- ✅ Resets to page 1 when sorting changes
+- ✅ Loading indicator shows during fetch
+
+## Testing
+
+To test sorting:
+1. Navigate to `/admin/data-browser/time-entries`
+2. Click any column header with a sort icon
+3. Verify data is sorted correctly
+4. Click again to reverse sort direction
+5. Verify arrow icon changes direction
+6. Verify page resets to 1 when sorting
+
+## Files Modified
+- `/app/admin/data-browser/time-entries/page.tsx` - Added sort state and handler
+
+## Related Components
+- `/components/admin/DataTable.tsx` - Generic table component with sort support
+- `/app/api/data/time-entries/route.ts` - API endpoint with sort parameters