feat(query-api): add richer stats and retention

internal/event/validate.go

@@ -14,7 +14,9 @@ var validTypes = map[string]bool{
 	"span.end":          true,
 	"error":             true,
 	"metric.snapshot":   true,
-	"openclaw.snapshot": true,
+	"openclaw.snapshot":       true,
+	"swarm.snapshot":          true,
+	"swarm.service.snapshot":  true,
 }
 
 type ValidationError struct {
@@ -62,7 +64,7 @@ func Validate(m map[string]any) error {
 	}
 
 	// Source is optional for openclaw.snapshot events
-	if eventType != "openclaw.snapshot" {
+	if eventType != "openclaw.snapshot" && eventType != "swarm.snapshot" && eventType != "swarm.service.snapshot" {
 		source, ok := event["source"].(map[string]any)
 		if !ok {
 			return ValidationError{Field: "event.source", Message: "missing or invalid"}