completed story 1.1 with QA tests and fixes

app/Models/AdminLog.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class AdminLog extends Model
+{
+    use HasFactory;
+
+    public $timestamps = false;
+
+    protected $fillable = [
+        'admin_id',
+        'action',
+        'target_type',
+        'target_id',
+        'old_values',
+        'new_values',
+        'ip_address',
+        'created_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'old_values' => 'array',
+            'new_values' => 'array',
+            'created_at' => 'datetime',
+        ];
+    }
+
+    /**
+     * Get the admin that created the log.
+     */
+    public function admin(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'admin_id');
+    }
+}