diff --git a/message.go b/message.go
index 21c535f..4966eb0 100644
--- a/message.go
+++ b/message.go
@@ -2,8 +2,8 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
-	"strconv"
 	"strings"
 )
 
@@ -99,8 +99,13 @@ func ParseSlack(b []byte) (Message, error) {
 	}
 
 	if s.Event.Bot.Name != "" {
+		if len(s.Event.Attachments) == 0 {
+			return Message{}, errors.New("bot message has no attachments")
+		} else if !strings.Contains(s.Event.Attachments[0].Title, ": Firing: ") {
+			return Message{}, errors.New("bot message attachment is not Firing")
+		}
 		return Message{
-			ID:        strconv.FormatUint(s.TS, 10),
+			ID:        fmt.Sprintf("%s/%v", s.Event.ID, s.TS),
 			TS:        s.TS,
 			Source:    fmt.Sprintf(`https://renderinc.slack.com/archives/%s/p%s`, s.Event.Channel, strings.ReplaceAll(s.Event.ID, ".", "")),
 			Channel:   s.Event.Channel,
@@ -113,7 +118,7 @@ func ParseSlack(b []byte) (Message, error) {
 	}
 
 	return Message{
-		ID:        strconv.FormatUint(s.TS, 10),
+		ID:        fmt.Sprintf("%s/%v", s.Event.ParentID, s.TS),
 		TS:        s.TS,
 		Source:    fmt.Sprintf(`https://renderinc.slack.com/archives/%s/p%s`, s.Event.Channel, strings.ReplaceAll(s.Event.ParentID, ".", "")),
 		Channel:   s.Event.Channel,
diff --git a/message_test.go b/message_test.go
index a73026a..2e302e8 100644
--- a/message_test.go
+++ b/message_test.go
@@ -34,7 +34,7 @@ func TestParseSlackTestdata(t *testing.T) {
 				},
 			},
 			message: Message{
-				ID:        "1712930706",
+				ID:        "1712927439.728409/1712930706",
 				TS:        1712930706,
 				Source:    "https://renderinc.slack.com/archives/C06U1DDBBU4/p1712927439728409",
 				Channel:   "C06U1DDBBU4",
@@ -68,7 +68,7 @@ func TestParseSlackTestdata(t *testing.T) {
 				},
 			},
 			message: Message{
-				ID:        "1712927439",
+				ID:        "1712927439.728409/1712927439",
 				TS:        1712927439,
 				Source:    "https://renderinc.slack.com/archives/C06U1DDBBU4/p1712927439728409",
 				Channel:   "C06U1DDBBU4",