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Attribute with the requested key already exists. (after relationship was deleted)
After deleting a relationship I get "Attribute with the requested key already exists. Attribute keys must be unique, try again with a different key.". The attribute is not shown in the console. If I query I still get the relationship attribute. So it's still there. Guess I will have to delete it in the mysql db manually
TL;DR
After deleting a relationship, developers are receiving an error stating "Attribute with the requested key already exists." This occurs because the attribute is still present in the database despite not being visible in the console. The solution is to manually delete the attribute from the MySQL database. 