Storage and filtering (local and global filter variables)

[verstraetejonas]

With dcc.dash (https://dash.plotly.com/dash-core-components/store) data or variables can be stored in the browser and shared between callbacks (https://dash.plotly.com/sharing-data-between-callbacks). This is particularly usefull to store filter parameters controled by sliders, buttons, … which affect multiple datavisualisations.
How and where do we define these store elements? Also it would be nice to have a choice between local filtering (only affecting a subpage), page filters affecting the whole parent page and global filters affecting the entire app. From the user (data expert) point of view the store element is ideally defined on the folder level (pages) it should affect.