Resolve "Coursebook frontend loads too much data"

Closes #329 (closed)

added part::frontend source::customer::kath type::bug workflow::current-todo labels

added 1 commit

• cab220e0 - Use reduced queries for coursebook extra data

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marked this merge request as ready

Probably ready, but not sure, @hansegucker

added 1 commit

• 4fafc61c - Use reduced queries for coursebook extra data

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merged

mentioned in commit a81f3354