PBXware uses MySQL 5 for storing data.
To access that database:
cd /opt/pbxware sh/mysql
When inside,
show databases;
This command will show several databases, among which you will have pbxware_xxx databases, where xxx are the numbers of your tenant prefix. So, if you have 5 tenants you will have 5 pbxware_xxx tables.
Let's say that you have a tenant with prefix 100.
use pbxware_100;
will use that tenant's database.
Now: show tables; will show all the tables in this database. CDRs table is named "cdr".
If you type: show fields from cdr; you will get list of fields which are pretty self-explanatory but here
http://www.voip-info.org/wiki/view/Asterisk+billing
you have most of the fields explained. The ones that are not:
tenant - tenant on which the call was made
billamount - how much the call was billed
accountcode - the extension which is making call and can be different from src field
userfield - extension which received a call and can be diferrent then dst field. In userfield sometimes you could have a recording if queue agents are in question
uniqueid - is a link to the recording which is essentially a timestamp when the call was recorded.