Import postgresql plugin

exec/handlers/file_picker.php

@@ -0,0 +1,18 @@
+<?php
+declare(strict_types=1);
+
+return static function (AppContext $ctx): void {
+    $queue = new BackupQueueService($ctx->settings, $ctx->daUser);
+    $root = '/home/' . $ctx->daUser->username();
+
+    if (FilePicker::handleDirList($ctx, $queue, $root)) {
+        return;
+    }
+    if (FilePicker::handleDirCreate($ctx, $root, $ctx->daUser->username())) {
+        return;
+    }
+
+    http_response_code(404);
+    header('Content-Type: text/plain; charset=UTF-8');
+    echo 'Not Found';
+};