Unable to rename or remove a domain in Plesk: mailmng-outgoing failed: ERROR:outgoing:No backend DB entries were modified

Symptoms

• Unable to manage domain settings (rename a domain, change a hosting type, add an email account, etc.):

  mailmng-outgoing failed: ERROR:outgoing:No backend DB entries were modified.

  ---

  mailmng-outgoing failed: ERROR:outgoing:domain_aliases.domain_id may not be NULL

• In /var/lib/plesk/mail/outgoing/data.db SQLite database, there is a record about alias.example.com:

  # sqlite3 /var/lib/plesk/mail/outgoing/data.db

  sqlite> SELECT id,name,subscription_id,out_limit FROM domains WHERE name='alias.example.com';
  13|alias.example.com|11|500'

• There is no alias.example.com record in psa.domains table:

  # plesk db 'select id, name from domains where name like "%alias.example.com%";'
  Empty set (0.00 sec)

Cause

An inconsistency of external database: a domain was not renamed.

Resolution

1. Connect to the server using SSH.

2. Create a backup of /var/lib/plesk/mail/outgoing/data.db database:

   # cp /var/lib/plesk/mail/outgoing/data.db{,_bk}

3. Log in to SQLite database:

   # sqlite3 /var/lib/plesk/mail/outgoing/data.db

4. Get the ID of the domain:

   SELECT id,name,subscription_id,out_limit FROM domains WHERE name='alias.example.com';
   10|alias.example.com|1|130

5. Rename the domain using the domain ID from the previous step:

   UPDATE domains SET name='example.com' WHERE id=10;

   If it is necessary to remove domain, delete the related records from the database:

   DELETE FROM domains WHERE id=10;

6. Verify the directory /var/qmail/mailnames/example.com does not exist. If it exists, perform steps from this article:
   Unable to swap domain and domain alias names: boost::filesystem::filesystem_error Directory not empty

Note: if additional errors occur during the attempt to rename a domain, step 5 should be repeated.