Commit workspace changes

app/Models/GroupActivityItem.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class GroupActivityItem extends Model
+{
+    use HasFactory;
+
+    public const VISIBILITY_PUBLIC = 'public';
+    public const VISIBILITY_INTERNAL = 'internal';
+
+    protected $fillable = [
+        'group_id',
+        'type',
+        'visibility',
+        'actor_user_id',
+        'subject_type',
+        'subject_id',
+        'headline',
+        'summary',
+        'is_pinned',
+        'occurred_at',
+    ];
+
+    protected $casts = [
+        'is_pinned' => 'boolean',
+        'occurred_at' => 'datetime',
+    ];
+
+    public function group(): BelongsTo
+    {
+        return $this->belongsTo(Group::class);
+    }
+
+    public function actor(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'actor_user_id');
+    }
+}