Chapter 18. Aging Circulations

Table of Contents

Global Flags
What Data is Aged?
How Circulations are Aged
Impacts on Billing Data

Evergreen allows for the bulk anonymization of circulation histories. Evergreen calls this aged circulation. Circulation statistics are preserved (total circs, last checkout/renewal date, checkout/renewal/checkin workstation, etc) but patron information (name : barcode) is replaced with <Aged Circulation> text and the link to the patron record is removed.

In the client, <Aged Circulation> will show in the patron field in Circulation History Tab and Show Last Few Circulations.

In the database, every time you attempt to DELETE a row from action.circ, it copies over the appropriate data to action.aged_circulation, then deletes the action.circ row.

Global Flags

There are four global flags used for aging circulations.

  1. Historical Circulation Retention Age - determines the timeframe for aging circulations based on transaction age (7 days, 14 days, 30 days, etc).
  2. Historical Circulations Per Copy - determines how many circulations to keep (ex. 1, 2, 3). If set to 1, Evergreen will always keep the last (most recent) circulation.
  3. Historical Circulations use most recent xact_finish date instead of last circ’s (true or false)
  4. Historical Circulations are kept for global retention age at a minimum, regardless of user preferences (true or false)