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Changes between Initial Version and Version 3 of Ticket #27996

initial	v3
1	1	After the introduction of the UUID Field in Django 1.8, I believe that django.contrib.postgres could benefit from some custom functions based on the pgcrypto extension of PostgreSQL (see https://www.postgresql.org/docs/9.6/static/pgcrypto.html). That kind of functions would be very helpful for apply a migration that adds a unique non-nullable field to a table with existing rows.
2	2
3		Starting from "Migrations that add unique fields" (see https://docs.djangoproject.com/en/dev/howto/writing-migrations/#migrations-that-add-unique-fields) I speed up the `gen_uuid` using `GEN_RANDOM_UUID` function~~, I change the function~~ from:
	3	Starting from "Migrations that add unique fields" (see https://docs.djangoproject.com/en/dev/howto/writing-migrations/#migrations-that-add-unique-fields) I speed up the `gen_uuid` using `GEN_RANDOM_UUID` function changing it from:
4	4
5	5	{{{