Principle of generating index, foreign key?

Question

Doctrine ORM

Can't figure out where and how it generates this metadata

['foreign_key' => 'fk_68c58ed95cc1316d', 'index' => 'idx_68c58ed95cc1316d', 'index' => 'uniq_68c58ed95cc1316d'],

It is necessary to manually generate these three fields, and before doing it, I would like to see how the doctrine does, perhaps it will be possible to use that piece of code instead of hacking my own worse.
Who knows where the generation takes place? Can you link to the file please?

Answer 1

It?
https://github.com/doctrine/dbal/blob/9ec9bb9bfc76...
Below is the method for indexes
And by a storm see where and how it twitches...