Add local dashboard staging

[patrick91]

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Aug 14, 2026 8:28pm

[claude]

Adds a local Pretix service (Compose profile) plus a deterministic stage seeder for exercising the dashboard against realistic data, and relaxes the Pretix STORAGES setting so local dev doesn't require S3.

A couple of minor points, nothing blocking:

• backend/dashboard/dev/seed_stage.py: Grant.objects.filter(conference=existing_conference)._raw_delete(using=Grant.objects.db) uses a private/undocumented QuerySet API (_raw_delete). Since GrantReimbursement and UserReview rows referencing these grants are already deleted above, a normal .delete() should work just as well and avoids depending on Django internals that could change across versions.
• pretix/settings.py: STORAGES["default"] is now only overridden to S3 when AWS_STORAGE_BUCKET_NAME is set, instead of unconditionally. This is fine for local dev, but for production it now silently falls back to whatever pretix.settings defines by default if the bucket name config is ever missing/misconfigured, rather than failing loudly. Worth double-checking that's the intended behavior.

Everything else (Compose profile gating, DEBUG/hostname guard in the seeder against pointing at hosted Pretix, default local-only credentials) looks reasonable for dev-only tooling.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.72%. Comparing base (5799e4f) to head (e691edb).

Additional details and impacted files

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##           2026-08-14-add-dashboard-analytics    #4777   +/-   ##
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  Coverage                               92.72%   92.72%           
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  Files                                     364      364           
  Lines                                   11444    11444           
  Branches                                  936      936           
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  Hits                                    10612    10612           
  Misses                                    692      692           
  Partials                                  140      140           

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