diff --git a/app/config/collections.php b/app/config/collections.php
index 807c6cca0f..08723686a7 100644
--- a/app/config/collections.php
+++ b/app/config/collections.php
@@ -1840,6 +1840,17 @@ $collections = [
                 'array' => false,
                 'filters' => [],
             ],
+            [
+                '$id' => 'metadata',
+                'type' => Database::VAR_STRING,
+                'format' => '',
+                'size' => 16384, // https://tools.ietf.org/html/rfc4288#section-4.2
+                'signed' => true,
+                'required' => false,
+                'default' => null,
+                'array' => false,
+                'filters' => ['json'],
+            ],
             [
                 '$id' => 'chunksTotal',
                 'type' => Database::VAR_INTEGER,