User Profile custom fields DB decyphering

Hello boys and girls.

Have a small question about the storage of custom User Profile fields. So I created a new field called test inside the profile.blade.php, allowed it and I am able to populate and keep the data safely.

For my data cross reference needs of the project, I started wondering where this data is kept as obviously it goes to the DB and not in a file and since I was not sure where to search for, I just simply exported the DB SQL, opened it and found my string to be located at: "wave_key_values"

So looking at the rows, I found my custom fields there and it is now clear how can I access this data from the DB directly if a need be.

I am inquiring to know what are the intentions of the rows, as there are:

ID - clear (it is the ID of the custom data record) type - clear (that is the type of the field to use, e.g. text/text_area etc.) keyvalue_id - UNCLEAR keyvalue_type - UNCLEAR (the default value is users) key - clear (that is the given field name) value - clear (that is the populated value of the custom field)

So what is the purpose of "keyvalue_id" and "keyvalue_type" and in terms of the type, what other types I can have as a use case?