Rework mailer database schema, add UUID to mailers

At this point, I sent out our first test mailers for Delta.

db/enums/enums.bob.go

@@ -457,76 +457,6 @@ func (e *Audiodatatype) Scan(value any) error {
 	return nil
 }
 
-// Enum values for CommsMailertype
-const (
-	CommsMailertypeGreenPool CommsMailertype = "green-pool"
-)
-
-func AllCommsMailertype() []CommsMailertype {
-	return []CommsMailertype{
-		CommsMailertypeGreenPool,
-	}
-}
-
-type CommsMailertype string
-
-func (e CommsMailertype) String() string {
-	return string(e)
-}
-
-func (e CommsMailertype) Valid() bool {
-	switch e {
-	case CommsMailertypeGreenPool:
-		return true
-	default:
-		return false
-	}
-}
-
-// useful when testing in other packages
-func (e CommsMailertype) All() []CommsMailertype {
-	return AllCommsMailertype()
-}
-
-func (e CommsMailertype) MarshalText() ([]byte, error) {
-	return []byte(e), nil
-}
-
-func (e *CommsMailertype) UnmarshalText(text []byte) error {
-	return e.Scan(text)
-}
-
-func (e CommsMailertype) MarshalBinary() ([]byte, error) {
-	return []byte(e), nil
-}
-
-func (e *CommsMailertype) UnmarshalBinary(data []byte) error {
-	return e.Scan(data)
-}
-
-func (e CommsMailertype) Value() (driver.Value, error) {
-	return string(e), nil
-}
-
-func (e *CommsMailertype) Scan(value any) error {
-	switch x := value.(type) {
-	case string:
-		*e = CommsMailertype(x)
-	case []byte:
-		*e = CommsMailertype(x)
-	case nil:
-		return fmt.Errorf("cannot nil into CommsMailertype")
-	default:
-		return fmt.Errorf("cannot scan type %T: %v", value, value)
-	}
-
-	if !e.Valid() {
-		return fmt.Errorf("invalid CommsMailertype value: %s", *e)
-	}
-
-	return nil
-}
-
 // Enum values for CommsMessagetypeemail
 const (
 	CommsMessagetypeemailInitialContact                 CommsMessagetypeemail = "initial-contact"