Target <-> Protein Class many2many relation is implemented in a wrong way

[mnowotka]

While working on the interactive web services diagram I spot this problem. The link between Target and Target Component is on the Target side:

So Target contains a list of Target Components data. Now, while there is nothing wrong in having this list as this might be helpful for people exploring this endpoint, this is wrong from the many 2 many relationship point of view. The link should be on the Target Components side so each Target Component should have a target_chembl_id field, the same way many2many relation is implemented between Molecule and Target (via Mechanism):

Another problem is that protein_classification_id field is nested inside the Target Component endpoint, giving a false impression that there can be more than one Protein Classification object for a given Target Component. This should be flattened.