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integrity constraint violation: 1452 cannot add or update a child row: a foreign key constraint fails

It just simply means that the value for column project_id on table comments you are inserting doesn't exist on table projects. Bear in mind that the values of column project_id on table comments is dependent on the values of ID on table Projects.

The value 50dc845a-83e4-4db3-8705-5432ae7aaee3 you are inserting for column project_id does not exist on table projects.
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ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails

Its Simple

Use user brain and eyes 
and check dose all data add into the patients table

Sp-  Don't trust your friends
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