tasks: add pre_delete for TasksModel to avoid OOM when deleting object with many tasks linked

[rissson]

Details

What does this PR change?

Why is this change needed?

How was this tested?

Linked issues

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Checklist

• The project has been linted, built, and tested (make all)
• The documentation has been updated and formatted (make docs)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.19%. Comparing base (6c90027) to head (16a1087).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23664      +/-   ##
==========================================
+ Coverage   93.14%   93.19%   +0.04%     
==========================================
  Files        1039     1039              
  Lines       60860    60868       +8     
  Branches      424      424              
==========================================
+ Hits        56688    56723      +35     
+ Misses       4172     4145      -27     

Flag	Coverage Δ
conformance	36.30% <77.77%> (+<0.01%)	⬆️
e2e	41.51% <100.00%> (+0.26%)	⬆️
integration	32.24% <77.77%> (-0.49%)	⬇️
rust	0.00% <ø> (ø)
unit	92.30% <100.00%> (+<0.01%)	⬆️
unit-migrate	92.33% <100.00%> (-0.01%)	⬇️

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authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-16a108723ff07a5c1fa180961677c6e4f6ffc45f
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

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authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-16a108723ff07a5c1fa180961677c6e4f6ffc45f

Afterwards, run the upgrade commands from the latest release notes.

[melizeche]

looks good to me. Do you think adding tests for task deletion is worth it here or nah?

[rissson]

looks good to me. Do you think adding tests for task deletion is worth it here or nah?

They will be deleted regardless. This is just us doing it a bit earlier to avoid the OOM

[authentik-automation]

🍒 Cherry-pick to version-2026.5 created: #23666