constraint primary key (user_id)
) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
+
+create table conversation (
+ id integer auto_increment primary key comment 'unique identifier',
+ uri varchar(225) unique comment 'URI of the conversation',
+ created datetime not null comment 'date this record was created',
+ modified timestamp comment 'date this record was modified'
+) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin;
+