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Update persistence.md () 

* 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

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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
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`.
Select your default service from the drop-down list.
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.
## 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
The information below allows you to determine which Item states are persisted, when they are persisted, and where they are stored.