diff --git a/migrations/schema.sql b/migrations/schema.sql
index 72ebc9f10..fccf622e4 100644
--- a/migrations/schema.sql
+++ b/migrations/schema.sql
@@ -87,6 +87,7 @@ CREATE TABLE IF NOT EXISTS apps(
     mailboxName VARCHAR(128), // mailbox of this app. default allocated as '.app'
     label VARCHAR(128),     // display name
     tagsJson VARCHAR(2048), // array of tags
+    dataDir VARCHAR(256) UNIQUE,
 
     // the following fields do not belong here, they can be removed when we use a queue for apptask
     restoreConfigJson VARCHAR(256), // used to pass backupId to restore from to apptask