Except as otherwise provided in this Charter, all persons holding positions in the classified service of the City at the time this Charter takes effect shall be deemed to be in the classified service and shall retain their positions until discharged, reduced, promoted, or transferred in accordance with the civil service provision of this Charter. The Commission shall maintain a list of all persons in the classified service, showing in connection with each name the position held, the date and character of each appointment and of subsequent change in status. Each appointing officer shall promptly transmit to the Commission all information required for the establishment and maintenance of the list.