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The database value for expiry_date is None for the invite that will never expire and the clients send -1 as value in the API similar to the message retention setting. Also, when passing invite_expire_in_days as an argument in various functions, invite_expire_in_days is passed as -1 for "Never expires" option since invite_expire_in_days is an optional argument in some functions and thus we cannot pass "None" value.