chore: make connection paging more like standard

pkg/es/event/events.go

@@ -60,6 +60,9 @@ func (lis Events) StreamID() string {
 func (lis Events) SetStreamID(streamID string) {
 	SetStreamID(streamID, lis...)
 }
+func (lis Events) Count() int64 {
+	return int64(len(lis))
+}
 func (lis Events) First() Event {
 	if len(lis) == 0 {
 		return NilEvent

pkg/es/event/reflect.go

@@ -261,11 +261,30 @@ func Values(e Event) map[string]any {
 			continue
 		}
 
+		omitempty := false
 		field := v.FieldByIndex(idx.Index)
 
 		name := idx.Name
 		if n, ok := idx.Tag.Lookup("json"); ok {
-			name = n
+			var (
+				opt   string
+				found bool
+			)
+
+			name, opt, found = strings.Cut(n, ",")
+			if name == "-" {
+				continue
+			}
+
+			if found {
+				if strings.Contains(opt, "omitempty") {
+					omitempty = true
+				}
+			}
+		}
+
+		if omitempty && field.IsZero() {
+			continue
 		}
 
 		m[name] = field.Interface()