#31653: PostgreSQL add constraints via NOT VALID / VALIDATE CONSTRAINT
-------------------------------------+-------------------------------------
     Reporter:  Adam (Chainz)        |                    Owner:  nobody
  Johnson                            |
         Type:                       |                   Status:  new
  Cleanup/optimization               |
    Component:  Migrations           |                  Version:  master
     Severity:  Normal               |               Resolution:
     Keywords:                       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Adam (Chainz) Johnson):

 It doesn't need to be deferred, as I understand it can be done within a
 migration transaction. I was imagining `SchemaEditor.add_constraint` can
 be overridden to add the `NOT VALID` clause then execute the second
 `VALIDATE CONSTRAINT`.

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Ticket URL: <https://code.djangoproject.com/ticket/31653#comment:2>
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