Handle null referrer in pixel tracking route

Fixkamo-analytics
Ya
13 Februari 2026, 07:39 UTC
Mwandishi
juanisidoro
Ahadi ya
3d8d5a7

request.headers.get("referer") returns null when the header is absent (e.g. email clients). The Zod schema uses .optional() which accepts undefined but rejects null, causing silent validation failure and pixel events not being recorded. Fixes #4028

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