Bug:
When adding a column to a table with a time field that has an existing default value, the alteration fails.

Expected behavior:
It should work

Problem:
When rendering the default value for the time field, the number is formatted for humans. I.e. 110000 becomes 11:00:00 in the UI.

However, when altering the table, your code is performing an UPDATE query that tries to set 11:00:00 as the default value for a TIME type column, which fails.

Workaround:
Manually editing 11:00:00 to 110000 before saving your changes to the table causes the update to succeed.

@Joseph-Benguira