How can I add a CRUD system into wordpress?
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I've searched high and low into finding a way to integrate a CRUD , create read update delete , table system database into wordpress.

Users would essentially login and then be redirected to the front end which would show the data table / grid and be able to add records / edit / delete as necessary.

Would have to be able to export the data via xls, pdf, csv etc
Would also need the capability to also integrate a calendar somehow with the records.

For example if I create a records full of patients, and after the column for name I have a column for status and if it is activated then the calendar would pick it up.

I'm kind of talking out of my head here I know , I'm just trying to conceptualize what I am trying to accomplish.

I'm a wordpress vet and I know that its vastly flexible but what I'm asking for is a bit of a niche demand.

I appreciate anyone who stops by to answering my question