Hugh A Miles II dbea4b6c87 feat(export): S3 upload + presigned URL utility ...

Add superset.utils.s3 with upload_file_to_s3() (boto3 managed multipart) and
generate_presigned_url(). Credentials/region come from the standard boto3 chain;
operators can override client construction via EXCEL_EXPORT_S3_CLIENT_KWARGS
(e.g. endpoint_url for MinIO/LocalStack). Adds unit tests with mocked boto3.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-16 14:48:34 -07:00

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