feat: redirect /sign-up to /signup

[joethreepwood]

Problem

Users (and external links) occasionally hit /sign-up instead of the canonical /signup. Today that path falls through to the catch-all and forces a login, instead of landing on the signup page.

Changes

• Add a permanent (301) URL pattern in posthog/urls.py that redirects /sign-up (with or without trailing slash) to /signup, preserving the query string via Django's RedirectView(query_string=True).
• The redirect is path-based, so it works for every subdomain (app., us., eu.) without per-host configuration — the host is preserved by the relative redirect.

How did you test this code?

I'm an agent. I added parameterized automated tests in posthog/test/test_urls.py covering both slash variants and with/without query strings, asserting a 301 and the correct Location header. I could not execute the test suite in the sandboxed environment (no hogli/flox/uv/Django installed), so CI will need to confirm the run.

Publish to changelog?

do not publish to changelog

Docs update

No docs change needed.

🤖 Agent context

• Tool: PostHog Code (Claude Opus 4.7).
• Considered handling the redirect at the load balancer / web server, but a Django URL pattern keeps the behavior consistent across local dev, self-hosted, and cloud, and is trivially testable.
• Chose RedirectView with permanent=True, query_string=True so that signup links carrying ?email=… or campaign parameters survive the hop.
• Inserted the route before the unauthenticated frontend routes and the catch-all so it matches first.

---

Created with PostHog Code

[greptile-apps]

_{Reviews (1): Last reviewed commit: "Merge branch 'master' into posthog-code/..." | Re-trigger Greptile}

[ivanagas]

This one is a bit out of my area of expertise I think as we're messing with the router for the entire app which I'd be scared to break 😅

[deployment-status-posthog]

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-05-29 23:26 UTC	Run
prod-us	✅ Deployed	2026-05-29 23:39 UTC	Run
prod-eu	✅ Deployed	2026-05-29 23:40 UTC	Run