feat: add `GET /events/trending` — top events by scan velocity in the last 24 hours

[BigBen-7]

Description

Ticket buyers want to know what events are "hot right now". Scan velocity (scans per hour in the last 24 hours) is a strong proxy for demand and a useful discovery surface.

Requirements & context

• GET /events/trending?limit=10 (public, no auth)
• Queries ticket_scans grouped by event_id, counting scans in the last 24 hours, ordered descending
• Returns: { "events": [ { "event_id", "scan_count_24h", "rank" } ], "generated_at" }
• Join with event_sales_summary to include event_name in the response
• Cache for 10 minutes — trending data does not need to be real-time
• Write tests with seeded scan data

Suggested execution

git checkout -b feat/trending-events-endpoint

• Add get_trending_events(limit, hours) to AnalyticsService
• Add route to src/main.py
• Write tests

Guidelines

• PR must include: Closes #[issue_id]
• Timeframe: 48 hours

[TomikeDS]

@TomikeDS has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

can i work on this?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @TomikeDS to this issue.

[drips-wave]

Congratulations, @TomikeDS! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @TomikeDS: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @TomikeDS as part of the Stellar Wave Program's 3rd Wave 🥳

😎 @TomikeDS: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.