openvpn script to track data/bandwidth usage

NO AUTO BIDS. I will automatically refuse your bid as wasting my time. I need a script that can keep track of client data and bandwidth usage on openvpn. I keep track of session usage using the ovpn status log file but when a client disconnects and reconnects, the data is lost as it restarts on the next session. I need to keep track of the total amount of data used over day, week, month. The script will run as a cron job on Centos 7.9, updating a simple one table database showing how much data has been used per hour, per day, week and month. The data must NOT be overwritten but allow me to later select so I can see what the usage was as mentioned above. Note that clients are known by an ID that never changes which makes it easier to track even if their VIP changes. If you know how to add estimated bandwidth use as well, even better. Build it on your own server, share the code until we have this working then I release the payment. I will set up what ever is needed at my end. Your bid is your BID! Do not change it after you bid. I have clearly explained what I need. This is a simple job to anyone that knows ovpn.