#35469: Squashing migrations from unique=True to unique=False to 
UniqueConstraint
produces irreversible migration on Postgres
-----------------------------+------------------------------------
     Reporter:  Jacob Walls  |                    Owner:  nobody
         Type:  Bug          |                   Status:  new
    Component:  Migrations   |                  Version:  4.2
     Severity:  Normal       |               Resolution:
     Keywords:               |             Triage Stage:  Accepted
    Has patch:  0            |      Needs documentation:  0
  Needs tests:  0            |  Patch needs improvement:  0
Easy pickings:  0            |                    UI/UX:  0
-----------------------------+------------------------------------
Comment (by Jacob Walls):

 Sorry, still forming first impressions here, but just piping up to clarify
 that my last comment mostly barks up the wrong tree: the field values for
 `db_index` and whatnot look fine. And on a closer read of #28646, it
 strikes me as mostly focused on SlugField, which *doesn't* have the
 problem presented here. So I think having separate tickets makes sense.
-- 
Ticket URL: <https://code.djangoproject.com/ticket/35469#comment:5>
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