delete old tab bundles before making new ones

pipeline/05_bundle_gen/main.go

@@ -131,8 +131,16 @@ func main() {
 	}
 	wg.Wait()
 
+	// Clean old bundles before writing new ones (avoids orphans if count changed)
+	if !cfg.DryRun {
+		fmt.Println("\nCleaning old bundles from S3...")
+		if err := s3DeletePrefix(ctx, cfg.SiteBucket, "tabs/"); err != nil {
+			log.Fatalf("Failed to clean old bundles: %v", err)
+		}
+	}
+
 	// Chunk into bundles and write
-	fmt.Println("\nWriting bundles...")
+	fmt.Println("Writing bundles...")
 	bundleCount := 0
 	var totalBytes int64
 

pipeline/05_bundle_gen/s3.go

@@ -3,11 +3,13 @@ package main
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
 	"github.com/aws/aws-sdk-go-v2/config"
 	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/aws/aws-sdk-go-v2/service/s3/types"
 )
 
 var s3Client *s3.Client
@@ -44,3 +46,35 @@ func s3UploadBundle(ctx context.Context, bucket, key string, data []byte) error
 	})
 	return err
 }
+
+// s3DeletePrefix deletes all objects under a prefix in S3.
+func s3DeletePrefix(ctx context.Context, bucket, prefix string) error {
+	paginator := s3.NewListObjectsV2Paginator(s3Client, &s3.ListObjectsV2Input{
+		Bucket: aws.String(bucket),
+		Prefix: aws.String(prefix),
+	})
+
+	for paginator.HasMorePages() {
+		page, err := paginator.NextPage(ctx)
+		if err != nil {
+			return err
+		}
+		if len(page.Contents) == 0 {
+			continue
+		}
+
+		var objects []types.ObjectIdentifier
+		for _, obj := range page.Contents {
+			objects = append(objects, types.ObjectIdentifier{Key: obj.Key})
+		}
+
+		_, err = s3Client.DeleteObjects(ctx, &s3.DeleteObjectsInput{
+			Bucket: aws.String(bucket),
+			Delete: &types.Delete{Objects: objects},
+		})
+		if err != nil {
+			return fmt.Errorf("delete batch: %w", err)
+		}
+	}
+	return nil
+}