add all controllers logic

app/Services/System/DatabaseHealthService.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Services\System;
+
+use Illuminate\Support\Facades\DB;
+
+class DatabaseHealthService
+{
+    public function check(): array
+    {
+        try {
+            DB::select('SELECT 1');
+        } catch (\Throwable $e) {
+            return [
+                'ok' => false,
+                'error' => $e->getMessage(),
+            ];
+        }
+
+        return [
+            'ok' => true,
+        ];
+    }
+}