fix: handle opaque attachment references

loadtest/im-pressure/dbverify.go

@@ -41,8 +41,9 @@ func runDBVerify(ctx context.Context, coordinatorPath, output, tenantCode, dsnEn
 		return err
 	}
 	var coordinator struct {
-		Start   StartInfo                    `json:"start"`
-		Ledgers map[string][]AcceptedMessage `json:"ledgers"`
+		Start    StartInfo                    `json:"start"`
+		Ledgers  map[string][]AcceptedMessage `json:"ledgers"`
+		Observed map[string][]AcceptedMessage `json:"observed"`
 	}
 	if err = json.Unmarshal(raw, &coordinator); err != nil {
 		return fmt.Errorf("decode coordinator: %w", err)
@@ -77,17 +78,11 @@ func runDBVerify(ctx context.Context, coordinatorPath, output, tenantCode, dsnEn
 		return err
 	}
 
-	expected := make(map[string]AcceptedMessage)
+	expected := expectedDBMessages(coordinator.Start.RunID, coordinator.Ledgers, coordinator.Observed)
 	months := make(map[string]struct{})
-	for _, ledger := range coordinator.Ledgers {
-		for _, message := range ledger {
-			if message.RunID != coordinator.Start.RunID {
-				continue
-			}
-			expected[message.ClientMid] = message
-			if message.Kind == "group" {
-				months[message.SentAt.UTC().Format("200601")] = struct{}{}
-			}
+	for _, message := range expected {
+		if message.Kind == "group" {
+			months[message.SentAt.UTC().Format("200601")] = struct{}{}
 		}
 	}
 	tables := []string{fmt.Sprintf("im_%03d_messages", tenantID)}
@@ -167,3 +162,20 @@ func runDBVerify(ctx context.Context, coordinatorPath, output, tenantCode, dsnEn
 	}
 	return nil
 }
+
+func expectedDBMessages(runID string, ledgers, observed map[string][]AcceptedMessage) map[string]AcceptedMessage {
+	all := make([]AcceptedMessage, 0)
+	for _, messages := range observed {
+		all = append(all, messages...)
+	}
+	for _, messages := range ledgers {
+		all = append(all, messages...)
+	}
+	expected := make(map[string]AcceptedMessage, len(all))
+	for _, message := range mergeMessageLedgers(nil, all) {
+		if message.RunID == runID && message.ClientMid != "" {
+			expected[message.ClientMid] = message
+		}
+	}
+	return expected
+}