✨ Enhance NATS configuration and error handling. Introduce stream limits and consumer rules in configuration files. Refactor message processing to handle permanent errors. Update README and development configuration to reflect changes. Add tests for new error handling mechanisms.

internal/infra/nats/publisher.go

@@ -2,11 +2,13 @@ package nats
 
 import (
 	"caatsm/internal/adapter"
+	"caatsm/internal/domain"
 	"caatsm/internal/infra/config"
 	"encoding/json"
 	"fmt"
-	"go.uber.org/zap"
+	"github.com/google/uuid"
 	"github.com/nats-io/nats.go"
+	"go.uber.org/zap"
 )
 
 // Publisher publishes messages to NATS JetStream
@@ -42,8 +44,23 @@ func (p *Publisher) Publish(message interface{}) error {
 		return fmt.Errorf("failed to marshal message: %w", err)
 	}
 
+	// Build JetStream message to attach dedup headers
+	jsMsg := nats.NewMsg(topic)
+	jsMsg.Data = messageBytes
+
+	switch typed := message.(type) {
+	case *domain.ParsedMessage:
+		if typed != nil && typed.Uuid != "" {
+			jsMsg.Header.Set("Nats-Msg-Id", typed.Uuid)
+		} else {
+			jsMsg.Header.Set("Nats-Msg-Id", uuid.NewString())
+		}
+	default:
+		jsMsg.Header.Set("Nats-Msg-Id", uuid.NewString())
+	}
+
 	// Publish to JetStream
-	_, err = p.js.Publish(topic, messageBytes)
+	_, err = p.js.PublishMsg(jsMsg)
 	if err != nil {
 		return fmt.Errorf("failed to publish message: %w", err)
 	}