New table column for

Hi, for an upcoming update of GlotPress I need a new column user_id_last_modified for the translations table.

The query:
ALTER TABLE translate_translations ADD COLUMN user_id_last_modified bigint(20) DEFAULT NULL;
Running this query on my local dump took 9 min 32.67 sec (35207550 rows affected).

@barry: Can you run the query on each server like you did for the index change? Thank you!