The short version: as little as we can get away with. The longer version:
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Email address. Required so we can sign you in and send confirmations.
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Profile bits. Name, handle, avatar colour, optional bio. Optional except for the handle, which we need so other members can find you.
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Borough preference. Optional. Helps us surface sessions near you.
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RSVPs. Which sessions you joined, who hosted them, whether the host approved you.
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Session messages. Anything you write inside a session chat is stored against your account.
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Technical metadata. IP address, browser, timestamps. Held by Supabase and Vercel in their standard request logs. We use this for security, debugging, and spotting abuse. We do not run analytics cookies, we do not run ad tracking, and we do not sell any of it.