Adjust DB structure to support filtering conversations and deleting them

I know this is not a specific GWT question, but I have an issue. I have a GWT application, which has a conversation system integrated within. To this conversation system, I have the following DB structure.

create table if not exists conversation(      id int(11) PRIMARY KEY AUTO_INCREMENT,      user_one varchar(25) NOT NULL,      user_two varchar(25) NOT NULL,      subject varchar(15) NOT NULL,      ip varchar(30) DEFAULT NULL,      date varchar(50) NOT NULL,      filter varchar(20) DEFAULT 'Inbox'  );    create table if not exists conversation_reply(      id int(11) PRIMARY KEY AUTO_INCREMENT,      reply text,      username varchar(25) NOT NULL,      ip varchar(30) DEFAULT NULL,      date varchar(50) NOT NULL,      conv_id_fk int(11) NOT NULL REFERENCES conversation(id)  );

I implemented a filtering mechanism where you can move conversation from Inbox to Archive or Important, or others. But when I execute the query which updates the filter:

update conversation set filter=? where id=?;

It will update this both to the user_one and user_two, since the GUI is the same to both users..there is no difference between user_one and user_two in terms of how the GUI looks like. So the select, which gets all conversations looks like this:

select * from conversation where (user_one=? or user_two=?) and filter=? order by id desc;

How should I change the DB structure in order to make the operations above (moving and deleting) work properly, because as I said, when I move as user_one, it will move to user_two as well, deleting the conversation from one would delete it from the other too.

Suggestions?

Thanks in advance.

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