Updated ERP with new modules and features

app/Models/ActivityLog.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ActivityLog extends Model
+{
+    protected $fillable = [
+        'user_id', 'loggable_type', 'loggable_id', 'action', 
+        'old_data', 'new_data', 'ip_address', 'user_agent'
+    ];
+
+    protected $casts = [
+        'old_data' => 'array',
+        'new_data' => 'array',
+    ];
+
+    // Links back to the User who made the change
+    public function user()
+    {
+        return $this->belongsTo(StaffMember::class);
+    }
+
+    // Links back to the affected Model (Client, Server, VpnConfig, etc.)
+    public function loggable()
+    {
+        return $this->morphTo();
+    }
+}