Add Container field

app/Models/ChatMessage.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class ChatMessage extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'ticket_id',
+        'sender_id',
+        'sender_type',   // user OR admin
+        'message',
+        'file_path',
+        'file_type',
+    ];
+
+    /**
+     * The ticket this message belongs to.
+     */
+    public function ticket()
+    {
+        return $this->belongsTo(SupportTicket::class, 'ticket_id');
+    }
+
+    /**
+     * Polymorphic sender (User or Admin)
+     */
+    public function sender()
+    {
+        return $this->morphTo();
+    }
+}