This is followup of T119752: Review schema changes for T119495 in which the sql script executed was from an older patchset and made the added columns not-nullable.
Please correct it by making it nullable as follows
ALTER TABLE /*_*/cx_translations MODIFY translation_source_revision_id INT UNSIGNED NULL, MODIFY translation_target_revision_id INT UNSIGNED NULL;
There is no gerrit patch related to this since the patchset https://gerrit.wikimedia.org/r/#/c/255662 has correct script.