BUG #9424: Database size increased by 10MB everyday

The following bug has been logged on the website:

Bug reference:      9424
Logged by:          Tejaswini
Email address:      tejaswinihj24@yahoo.co.in
PostgreSQL version: 9.2.5
Operating system:   Windows
Description:

I am using Windows 2008 R2 and PostgreSQL 9.2.5

Each day, the DB backup is increased by about 10 MB. On
investigation, it was discovered that table size of one table used by the
application is increasing on daily basis by about 60MB. It appears
that that the formula / expression queue cleanup job that is scheduled
for every half an hour is not running properly.