users and institutions route, tests fixed

backend/app/Models/Lists/UserPosition.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models\Lists;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use OwenIt\Auditing\Auditable as AuditableTrait;
+use OwenIt\Auditing\Contracts\Auditable;
+
+class UserPosition extends Model implements Auditable
+{
+    use AuditableTrait;
+    use HasFactory;
+
+    public const PROFESSOR = 'Professor';
+
+    public const RESEARCHER = 'Researcher';
+
+    public const PHD = 'PhD';
+
+    public const STUDENT = 'Student';
+
+    public const ADMINISTRATIVE = 'Administrative personnel';
+
+    protected $table = 'user_positions';
+
+    protected $fillable = ['value'];
+}