SAP Sysbase sybsid user deleted

Hi Experts,

I need urgent help on the following problem we are facing on Sybase user

one of the user syb<SID> user was deleted from the operating system now we are not able to do the db configuration on it

mainly DB log clearing when we type ISQL command in the powersell we are getting following error

how to reconfigure the sybda1 user so that i can perform the DB transcation

or is there any way to clear the log without login to the sybsid user

Urgent help needed

Regards

SROY