queue: include send time in messages

queue/message.go

@@ -18,6 +18,9 @@ type Message struct {
 	Channel string `json:"ch"`
 	// Sender is an obfuscated identifier for the sending user.
 	Sender sender `json:"u"`
+	// Timestamp is the time at which the message was sent in nanoseconds since
+	// the Unix epoch.
+	Timestamp int64 `json:"ts"`
 	// Text is the message content.
 	Text string `json:"t"`
 }

queue/message_test.go

@@ -21,10 +21,11 @@ func (p *spyProducer) Produce(ctx context.Context, rec *kgo.Record, promise func
 
 func TestSend(t *testing.T) {
 	msg := queue.Message{
-		ID:      "bocchi",
-		Channel: "kessoku",
-		Sender:  queue.Sender(make([]byte, 16), "kessoku", "ryō"),
-		Text:    "bocchi the rock!",
+		ID:        "bocchi",
+		Channel:   "kessoku",
+		Sender:    queue.Sender(make([]byte, 16), "kessoku", "ryō"),
+		Timestamp: 1,
+		Text:      "bocchi the rock!",
 	}
 	var q spyProducer
 	errs := make(chan error, 1)