This table stores the message properties for delayed messages.
Column  | Data Type  | Constraint  | 
|---|---|---|
  | NUMERIC(19)  | NOT NULL  | 
A generated ID identifying the message.  | ||
  | VARCHAR(250)  | NOT NULL  | 
The message property name.  | ||
  | VARCHAR(250)  | NOT NULL  | 
The message property value.  | 

