Multi-device push rollout incomplete as old logout behavior still removes all device tokens

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A server can now store several push tokens per user, but an older app version's logout still deletes every device's registration. Testing paired old and new API routers with old and new logout methods against a local database using synthetic test strings. Results showed that only the new server plus device-specific deletion preserves the other device's token, while the old server or an all-device deletion call removes both. The server change does not restore previously deleted rows, so registration must run again on each device. The investigation did not measure how many real user devices have updated or re-registered, so completion of the rollout remains unconfirmed.

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