Add missed UsePostgres Trait

app/Traits/UsePostgres.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Models that store data in Postgres
+ */
+namespace App\Traits;
+
+trait UsePostgres
+{
+	/**
+	 * Resolve a connection instance.
+	 * We need to do this, because our relations are in pgsql and somehow loading a relation changes this models
+	 * connection information. Using protected $connection is not enough.
+	 *
+	 * @param  string|null  $connection
+	 */
+	public static function resolveConnection($connection = null)
+	{
+		return static::$resolver->connection('pgsql');
+	}
+}