add models and relations

app/Models/ContentReport.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Report (something objectionable spotted by a user)
+ */
+class ContentReport extends Model
+{
+    /** Authoring user */
+    public function author()
+    {
+        return $this->belongsTo(User::class, 'author_id');
+    }
+
+    /** Authoring user */
+    public function object()
+    {
+        return $this->morphTo();
+    }
+}