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All session just got invalidated to switch to a new cookie session system: shorter cookie life, stronger signature algorithm (sha1 was replaced by sha256) and key rotation https://github.com/inventaire/inventaire/pull/458
From the user point of view, that means you will need to re-login next time you access the service, and then once in a while (every 6 months by default)
From the developer point of view, if you were using your cookies for request authentication, you will need to renew them periodically.
That is, until we can provide OAuth tokens instead, see https://github.com/inventaire/inventaire/issues/84