fix: ignore duplicate action results during execution updates

backend/go-app/walkoff.go

@@ -593,6 +593,15 @@ func runWorkflowExecutionTransaction(ctx context.Context, attempts int64, workfl
 		return
 	}
 
+	if hasEquivalentActionResult(*workflowExecution, actionResult) {
+		log.Printf("[DEBUG][%s] Ignoring duplicate action result for action %s with status %s", workflowExecutionId, actionResult.Action.ID, actionResult.Status)
+		if resp != nil {
+			resp.WriteHeader(http.StatusOK)
+			resp.Write([]byte(`{"success": true, "reason": "duplicate result ignored"}`))
+		}
+		return
+	}
+
 	workflowExecution, dbSave, err := shuffle.ParsedExecutionResult(ctx, *workflowExecution, actionResult, false, 0)
 	if err != nil {
 		b, suberr := json.Marshal(actionResult)
@@ -628,6 +637,32 @@ func runWorkflowExecutionTransaction(ctx context.Context, attempts int64, workfl
 
 }
 
+func hasEquivalentActionResult(workflowExecution shuffle.WorkflowExecution, incoming shuffle.ActionResult) bool {
+	for _, existing := range workflowExecution.Results {
+		if existing.Action.ID != incoming.Action.ID {
+			continue
+		}
+
+		if existing.Status != incoming.Status {
+			continue
+		}
+
+		if existing.CompletedAt > 0 && incoming.CompletedAt > 0 && existing.CompletedAt == incoming.CompletedAt {
+			return true
+		}
+
+		if existing.StartedAt > 0 && incoming.StartedAt > 0 && existing.StartedAt == incoming.StartedAt {
+			return true
+		}
+
+		if len(existing.Result) > 0 && existing.Result == incoming.Result {
+			return true
+		}
+	}
+
+	return false
+}
+
 func JSONCheck(str string) bool {
 	var jsonStr interface{}
 	return json.Unmarshal([]byte(str), &jsonStr) == nil