Is it permissible for the dean to impose a daily sign-in system on lecturers (mu'eedin) and assistant lecturers without including professors, and is it permissible to sign in on behalf of a colleague on non-teaching days?

If the contract requires daily presence at the college for specific hours, then adherence to it is obligatory, and it is not permissible to sign on behalf of another. However, if the contract is summarized as teaching specific courses with flexible hours, then it is not permissible to compel teaching assistants to be present more than that, and they are permitted to employ stratagems to obtain their right. But it appears that the original contract stipulates commitment to daily presence for specific hours, and the allowance for non-attendance except during teaching hours is an incidental matter that the official can revoke for the benefit of the work.