feat(audience): add persistent device_id that survives logout#801
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A new deviceId UUID is generated on first init and stored alongside
anonymousId in the identity file. Unlike anonymousId, it is not rotated
on Reset() (logout) — only wiped on SetConsent(None) (opt-out).
This lets the CDP reconnect a returning player to their prior session
history even after logout, matching the PostHog/Amplitude pattern of
a stable device-level ID alongside a rotating user-level ID.
The identity file migrates transparently from the legacy plain-string
format to JSON {"anonymousId":"...","deviceId":"..."} on first read.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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bkbooth
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Jun 24, 2026
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Summary
Players who log out and back in were previously unrecognisable to the CDP — their
anonymousIdrotated on logout, severing the link to prior session history. This PR adds adeviceIdUUID that solves that: it is stable across logins and logouts, only cleared when the player fully opts out of tracking.deviceIdis generated once on first init (at Anonymous+ consent), stored alongsideanonymousIdin the on-device identity file, and sent on every event. On logout (Reset()),anonymousIdrotates as before butdeviceIdis preserved. On opt-out (SetConsent(None)), both are wiped. This matches the PostHog / Amplitude model of a stable device-level ID alongside a rotating user-level ID.The identity file format migrates from the legacy plain-string UUID to JSON
{"anonymousId":"...","deviceId":"..."}transparently on first read — the existinganonymousIdis preserved and a freshdeviceIdis generated.Test plan
deviceIdis non-null and non-empty at Anonymous and Full consentdeviceIdis null at None consent, no file writtendeviceIddiffers fromanonymousId(distinct UUIDs)deviceIdis stable across multiple calls in the same sessiondeviceIdpersists across a simulated restart (cache clear + reload from disk)deviceIdsurvivesReset()(logout);anonymousIdrotatesdeviceIdis wiped bySetConsent(None)(opt-out)deviceIdis present on track, identify, and alias events at Anonymous+ consentdeviceIdis absent from events when consent is NoneanonymousIdpreserved,deviceIdgenerated, file rewritten to JSONCloses SDK-538