How do you create tables for ORM entities in D7?

Question

1C-Bitrix

Often, during operation, the entity swells - new columns are added. How would you automate their creation? So that after each edit on dev, do not add them manually using SQL, first on dev, then on the test, and then on the battlefield, do not forget.
On some servers, I have a code update detection and this event triggers a PHP script that, for example, rebuilds styles. I would like to make additional creation of fields in it, if such appeared in entities.
How do you do it, if you do?
Comparing the results of getFields() and getMap(), and manually forming a request is somehow not beautiful and lazy.

Answer 1

migration handles are written. commit under git, and when uploaded by the command, they run