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This module allows you to use a single hook to easily extend the node edit form using any elements from the Form API. It automatically saves the contents of those fields using the Drupal 8 Key Value storage (rather than fields) to avoid a growing database. The saved data for the fields is made available on the node object.
Session Entity provides entities which are stored in the user's session. Each
user has one entity, which they may edit (provided they have the permission).