Support MySQL and PostgreSQL

Author: rmcdaniel

app/Http/Controllers/DashboardStatsController.php

@@ -25,7 +25,12 @@ public function index() {
             ->first();
 
         $maxDurationWorkflow = config('workflows.stored_workflow_model', StoredWorkflow::class)::select('*')
-            ->addSelect(DB::raw('(EXTRACT(EPOCH FROM created_at - updated_at)) as duration'))
+            ->when(config('database.default') === 'mysql', function ($q) {
+                return $q->addSelect(DB::raw('TIMEDIFF(created_at, updated_at) as duration'));
+            })
+            ->when(config('database.default') === 'pgsql', function ($q) {
+                return $q->addSelect(DB::raw('(EXTRACT(EPOCH FROM created_at - updated_at)) as duration'));
+            })
             ->where('status', '!=', 'pending')
             ->orderBy('duration')
             ->first();