Clarify how to store extension attributes in the database

[ioweb-gr]

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General issue

Affected topic: /guides/v2.4/extension-dev-guide/extension_attributes/adding-attributes.html
Description:

The article is not clarifying whether we should create our own table column for scalar attributes manually for example via db_schema.xml or via an InstallSchema setup script to persist the extension attribute value in the database.
Possible solutions:

Clarify what a developer needs to do to store the extension attribute in the database.
Additional information: