Feature request: Default "Who has paid?" value should be the current user

Hello,

In our situation the application is shared between all those that are contributing to the project. Thus there is a relation between the member of the project and the nextcloud users. In order to enter quickly the invoices it could be a good idea to set the default value of the "Who has paid?" field to the member linked to the current user.

My proposal is thus the following:

• Add a related_user to the member object / table.
• When sharing a project add a new member with related_user pointing to the nextcloud user
• When creating an invoice, select the first member for which related_user points to the current nextcloud user

Pros: quicker invoices encoding Cons: it's possible that some members are created but not deleted after the share.

Another possiblity would be to have the column but not filling it by default (and thus not creating the member) but if it's filled than it can be used to select the default value of the field.

Just my 2¢.