diff --git a/database/migrations/0018-combine_login_user_backups_and_user_table.ts b/database/migrations/0018-combine_login_user_backups_and_user_table.ts
new file mode 100644
index 000000000..9cc1853dd
--- /dev/null
+++ b/database/migrations/0018-combine_login_user_backups_and_user_table.ts
@@ -0,0 +1,49 @@
+/* MIGRATION TO COMBINE LOGIN_BACKUP_USERS TABLE WITH STATE_USERS
+ *
+ * This migration combines the table `login_user_backups` into
+ * the `state_users` table, where the later is the target.
+ */
+
+export async function upgrade(queryFn: (query: string, values?: any[]) => Promise<Array<any>>) {
+  // We only keep the passphrase, the mnemonic type is a constant,
+  // since every passphrase was converted to mnemonic type 2
+  // TODO there is now default NULL instead of NOT NULL - check code impact
+  await queryFn(
+    'ALTER TABLE `state_users` ADD COLUMN `passphrase` text DEFAULT NULL AFTER `publisher_id`;',
+  )
+
+  // Move data from `login_user_backups` to the newly modified `state_users` table.
+  await queryFn(`
+    UPDATE state_users
+    LEFT JOIN login_user_backups ON state_users.login_user_id = login_user_backups.user_id
+    SET state_users.passphrase = login_user_backups.passphrase
+    WHERE login_user_backups.passphrase IS NOT NULL
+    ;
+  `)
+
+  // Drop `login_user_backups` table
+  await queryFn('DROP TABLE `login_user_backups`;')
+}
+
+export async function downgrade(queryFn: (query: string, values?: any[]) => Promise<Array<any>>) {
+  await queryFn(`
+    CREATE TABLE \`login_user_backups\` (
+      \`id\` int(10) unsigned NOT NULL AUTO_INCREMENT,
+      \`user_id\` int(11) NOT NULL,
+      \`passphrase\` text NOT NULL,
+      \`mnemonic_type\` int(11) DEFAULT -1,
+      PRIMARY KEY (\`id\`)
+    ) ENGINE=InnoDB AUTO_INCREMENT=1862 DEFAULT CHARSET=utf8mb4;
+  `)
+  await queryFn(`
+    INSERT INTO login_user_backups
+      ( user_id, passphrase, mnemonic_type )
+      ( SELECT login_user_id AS user_id,
+               passphrase,
+               '2' as mnemonic_type
+        FROM state_users
+        WHERE passphrase IS NOT NULL )
+    ;
+  `)
+  await queryFn('ALTER TABLE `state_users` DROP COLUMN `passphrase`;')
+}