Rework the DB structure

[christianlupus]

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P.P.S.:
on the working nextcloud, there is this message in the log: (php 8.2.2)
Table "oc_cookbook_categories" has no primary key and therefor will not behave sane in clustered setups. This will throw an exception and not be installable in a future version of Nextcloud.

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Originally posted by @sreutter in #1954 (comment)

we must keep this in mind that we need to provide primary keys obviously for the future.