[RSN-23] - Create constraints

[rogacky11]

Description

I have created constraints for individual rows which are checking if added value's format is correct.

Related issue and/or ticket

RSN-23

[raczu]

@wzarek please verify that I didn't miss something.

[wzarek]

To check:

• events.participant: combination of event_id and user_id should be unique, we can even do it as primary key I think
• common.status: status name should be unique
• events.tag: tag name should be unique
• events.parameter: combination of key, value should be unique I think (to discuss)
• users.role: role name should be unique
• common.object_type: object type name should be unique
• common.image: we should check that object of type user have max of 1 image

Also please merge main into your branch before merging, it will be easier to resolve conflicts on your computer than on github just before merging.

[rogacky11]

To check:

* events.participant: combination of event_id and user_id should be unique, we can even do it as primary key I think

* common.status: status name should be unique

* events.tag: tag name should be unique

* events.parameter: combination of key, value should be unique I think (to discuss)

* users.role: role name should be unique

* common.object_type: object type name should be unique

* common.image: we should check that object of type user have max of 1 image

Also please merge main into your branch before merging, it will be easier to resolve conflicts on your computer than on github just before merging.

Every unique value mentioned here has been added. Furthermore to resolve problem with common.image and adding max 1 image for user, I have created unique index for object_type_id and object_id connection when object_type_id = 2 (it's user's obj_type_id)

[raczu]

lgtm

[wzarek]

OK

[wzarek]

@rogacky11 please rebase before merging and do squash and merge then.