The Calendar.Calendars table contains a list of all 'calendars' created in VPOP3. Each user account has at least one calendar
Columns
calid - this is a integer sequential value which identifies the calendar uniquely in the database
ownerid - this is the numeric user id of the account which owns this calendar. (Use the users.users table to find the numeric id from the user name)
name - this is the display name of the calendar
lastupdate - this is a timestamp containing when the calendar data was last updated. Triggers on the Calendar.Events table will automatically update this entry when an event is added/updated/deleted from this calendar
internalname - this is an internal name for the calendar. This is used in the CalDAV URL for accessing the calendar