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Update persistence.md (#1746) 

* Update persistence.md

Added short section about default configuration.

* Newline

Signed-off-by: Jerome Luckenbach <github@luckenba.ch>

Co-authored-by: Jerome Luckenbach <github@luckenba.ch>
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configuration/persistence.md
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@ -19,13 +19,19 @@ Please refer to the [available persistence service add-on](/addons/#persistence)
## Default Persistence Service ## Default Persistence Service
You should configure a default persistence service even if you have only one persistence add-on installed. The default persistence service is used to provide data for the UI charting features and rules (you may choose to use another persistence service in either of these, configured on a case-by-case basis). You should configure a default persistence service even if you have only one persistence add-on installed.
The default persistence service is used to provide data for the UI charting features and rules (you may choose to use another persistence service in either of these, configured on a case-by-case basis).
To select a default persistence service, in UI, select `Settings->Persistence`. To select a default persistence service, in UI, select `Settings->Persistence`.
Select your default service from the drop-down list. Select your default service from the drop-down list.
Note that you must first install a persistence add-on before you make this selection. Note that you must first install a persistence add-on before you make this selection.
Be sure to save your choice once you have selected your default service. Be sure to save your choice once you have selected your default service.
## Default Persistence Strategy
Once a persistence service is installed it will start to persist Items according to its default strategy. Defaults are documented for each persistence service in their respective [documentation pages](/addons/#persistence).
To overwrite the default strategy with something more appropriate for your setup, read on.
## Persistence Configuration ## Persistence Configuration
The information below allows you to determine which Item states are persisted, when they are persisted, and where they are stored. The information below allows you to determine which Item states are persisted, when they are persisted, and where they are stored.