#31255: Migrations create a redundant RemoveField operation when deleting 2 
models
with related fields.
-------------------------------------+-------------------------------------
     Reporter:  Panagis              |                    Owner:  Simon
  Alisandratos                       |  Charette
         Type:                       |                   Status:  assigned
  Cleanup/optimization               |
    Component:  Migrations           |                  Version:  master
     Severity:  Normal               |               Resolution:
     Keywords:  migration,optimizer  |             Triage Stage:  Accepted
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):

 * owner:  (none) => Simon Charette
 * status:  new => assigned
 * has_patch:  0 => 1


Comment:

 Submitted a draft PR.

 I'd like to try a shot at an alternative patch that changes
 `Operation.reduce`  signature to `(operation: Operation, app_label: str,
 state: ProjectState)` to allow the optimization to be enabled even for
 legacy projects with migrations that haven't tracked removed field and
 models over time. It would also avoid a ''public'' API change for
 `RemoveField` and `DeleteModel`.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31255#comment:19>
Django <https://code.djangoproject.com/>
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