Support SQLite dashboard time calculations

app/Livewire/Dashboard/DashboardPage.php

@@ -6,6 +6,7 @@ use App\Models\ActivityLog;
 use App\Models\ServiceRequest;
 use App\Models\Status;
 use App\Models\User;
+use App\Support\DatabaseExpression;
 use Illuminate\Database\Eloquent\Builder;
 use Livewire\Attributes\Layout;
 use Livewire\Component;
@@ -47,7 +48,7 @@ class DashboardPage extends Component
         $this->avgResolutionHours = (float) (ServiceRequest::query()
             ->whereNotNull('completed_at')
             ->whereDate('completed_at', '>=', now()->subDays(30))
-            ->selectRaw('AVG(TIMESTAMPDIFF(HOUR, created_at, completed_at)) as avg_hours')
+            ->selectRaw('AVG('.DatabaseExpression::hoursBetween('created_at', 'completed_at').') as avg_hours')
             ->value('avg_hours') ?? 0);
 
         $this->statusChart = Status::query()

app/Services/ReportService.php

@@ -7,6 +7,7 @@ use App\Models\RequestType;
 use App\Models\ServiceRequest;
 use App\Models\Status;
 use App\Models\User;
+use App\Support\DatabaseExpression;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Collection;
 
@@ -63,7 +64,7 @@ class ReportService
             $overdue = (clone $query)->overdue()->count();
             $avgResolution = (clone $query)
                 ->whereNotNull('completed_at')
-                ->selectRaw('AVG(TIMESTAMPDIFF(HOUR, created_at, completed_at)) as avg_hours')
+                ->selectRaw('AVG('.DatabaseExpression::hoursBetween('created_at', 'completed_at').') as avg_hours')
                 ->value('avg_hours');
             $rating = (clone $query)->whereNotNull('client_rating')->avg('client_rating');
 

app/Support/DatabaseExpression.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Support;
+
+use Illuminate\Support\Facades\DB;
+
+class DatabaseExpression
+{
+    public static function hoursBetween(string $startColumn, string $endColumn): string
+    {
+        if (DB::connection()->getDriverName() === 'sqlite') {
+            return "(julianday({$endColumn}) - julianday({$startColumn})) * 24";
+        }
+
+        return "TIMESTAMPDIFF(HOUR, {$startColumn}, {$endColumn})";
+    }
+}