Add dashboard analytics

[patrick91]

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[vercel]

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Project	Deployment	Actions	Updated (UTC)
pycon	Ready	Preview	Aug 14, 2026 8:26pm

[claude]

Adds Pretix-backed ticket sales analytics plus proposal/grant analytics and a conference timeline to the staff dashboard, with a new pretix_analytics.py module, paginated get_items/host-rewriting fixes in pretix/__init__.py, and a conference-comparison picker on the frontend.

No blocking issues found. A few things worth a look:

• Duplicated week-bucketing logic: the "bucket dates into a rolling 8-week window" logic is implemented three times — dashboard/views.py::_weekly_counts, dashboard/pretix_analytics.py::_week_values, and the inline loop in _build_ticket_analytics. Worth extracting into one shared helper so the three don't drift.
• Dead/unwired data paths: annotations, comparisonAnnotations, and comparisonValues are always emitted as empty from every analytics block in views.py/pretix_analytics.py, but conference-analytics.tsx has substantial logic to render them (annotation rows, ReferenceLine positioning, the "implicit" year-over-year comparison branch in CumulativeLineChart). If this isn't intentionally staged for a follow-up PR, it's effectively dead code shipped this round.
• Perf note: loading /dashboard/<code> builds analytics for the selected conference plus up to DASHBOARD_MAX_COMPARISON_CONFERENCES comparison conferences (3 total by default), and on a cache miss each one synchronously walks all paginated Pretix orders in the request path. The 15-minute cache mitigates this, but worth keeping an eye on for conferences with large order volumes / on first load after deploy.

[codecov]

Codecov Report

❌ Patch coverage is 85.65574% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.72%. Comparing base (421f609) to head (5799e4f).

Additional details and impacted files

@@                          Coverage Diff                           @@
##           2026-08-06-add-conference-switcher    #4776      +/-   ##
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- Coverage                               92.89%   92.72%   -0.17%     
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  Files                                     363      364       +1     
  Lines                                   11211    11444     +233     
  Branches                                  898      936      +38     
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+ Hits                                    10414    10612     +198     
- Misses                                    675      692      +17     
- Partials                                  122      140      +18     

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