| Field | Description | Type | Null | Key | Default | Extra |
| ------- | ----------------------------------------- | ------------------ | ---- | --- | ------------------- | -------------- |
| id | sequential ID | int unsigned | NO | PRI | NULL | auto_increment |
-| guid | A unique identifier for this conversation | varchar(255) | NO | | | |
+| guid | A unique identifier for this conversation | varbinary(255) | NO | | | |
| recips | sender_handle;recipient_handle | text | YES | | NULL | |
| uid | Owner User id | mediumint unsigned | NO | | 0 | |
| creator | handle of creator | varchar(255) | NO | | | |