This data can be purged by running a Stored Procedure in the DAReporting database.
1. Download and install Microsoft SQL Management Studio on the server hosting Desktop Authority or the administrator's computer. The newest version can be downloaded here.
2. Connect to the SQL instance hosting the Desktop Authority databases (DAConfiguration and DAReporting).
3. Go to Databases | DAReporting | Programmability | Stored Procedures and locate "dbo.PurgeHardwareAndSoftwareInventoryByDays"
4. Right click on the procedure and select "Execute Stored Procedure"
5. A new query will start, fill the "Value" field with how many days you want to keep data from "0 to 360".
6. Click OK, to run the stored procedure with the selected value.