diff --git a/upgrade.sql b/upgrade.sql
new file mode 100644
index 0000000..7e07e9c
--- /dev/null
+++ b/upgrade.sql
@@ -0,0 +1,15 @@
+/* 2023-03-11 Allow designating an owner for each tag */
+ALTER TABLE `tags` ADD `id_user_owner` INT  NULL  DEFAULT NULL  AFTER `id_asset_thumb`;
+
+/* 2023-03-11 Try to assign tag owners automagically */
+UPDATE tags AS t
+SET id_user_owner = (
+	SELECT id_user
+	FROM users AS u
+	WHERE LOWER(u.first_name) = LOWER(t.slug) OR
+		LOWER(u.first_name) = LOWER(t.tag) OR
+		LOWER(u.slug) = LOWER(t.slug) OR
+		LOWER(u.slug) = LOWER(t.tag)
+	)
+WHERE t.kind = 'Person' AND
+	(t.id_user_owner = 0 OR t.id_user_owner IS NULL);