{
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  "generated_at_utc": "2026-10-16T12:55:40.483Z",
  "record_id": "VXI-EXT-PROCUREMENT-SQS-FIFO-DEDUP-01-v1",
  "record_kind": "external_reference",
  "title": "SQS FIFO: Deduplication scope and business effects",
  "system": "Amazon SQS FIFO",
  "evidence_family": "vendor_evidence_review",
  "index_status": "PUBLIC_SAFE_SOURCE_REVIEW",
  "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY",
  "canonical_question": "Does FIFO deduplication prevent every duplicate business action?",
  "near_questions": [
    "How long does FIFO deduplication remember a send?",
    "Are message attributes included in the content hash?",
    "Can changed attributes share one deduplication identity?",
    "Who assigns the deduplication ID?",
    "What happens to a retry outside the interval?",
    "Does FIFO coordinate a payment transaction?",
    "Can a worker crash after its external action?",
    "What evidence proves safe consumer replay?",
    "Are queue admission and business completion separate?",
    "Does an accepted send prove a new message was added?",
    "Which ID should procurement trace across systems?",
    "Can I retain the FIFO evidence boundary?"
  ],
  "supported_claims": [
    {
      "claim": "SQS suppresses repeated sends within its documented deduplication interval. Content-based IDs use the message body rather than message attributes. This queue admission behaviour does not establish a transaction across the consumer and an external service, or protection for retries beyond that interval.",
      "reliance": "DOCUMENTED_CAPABILITY_ONLY"
    }
  ],
  "not_demonstrated_claims": [
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    "Independent execution, completeness or security testing",
    "Vendor certification, legal compliance or guaranteed suitability"
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  "public_summary": "SQS suppresses repeated sends within its documented deduplication interval. Content-based IDs use the message body rather than message attributes. This queue admission behaviour does not establish a transaction across the consumer and an external service, or protection for retries beyond that interval.",
  "related_record_ids": [],
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    "source_type": "official_external_documentation",
    "source_title": "SQS FIFO deduplication",
    "source_url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html",
    "checked_on": "2026-10-16",
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  },
  "answer_policy": {
    "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY",
    "bounded_answer": "SQS suppresses repeated sends within its documented deduplication interval. Content-based IDs use the message body rather than message attributes. This queue admission behaviour does not establish a transaction across the consumer and an external service, or protection for retries beyond that interval.",
    "required_buyer_context": "Deduplication configuration, message identity, retry interval and consumer transaction boundary. Effective configuration and dated operational evidence have not been inspected.",
    "missing_evidence": "A broader claim needs evidence matching the intended use. Payment does not upgrade the evidence state."
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  "decision_profile": {
    "schema": "varexis-vendor-evidence-review/1",
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    "checked_on": "2026-10-16",
    "claim_to_check": "FIFO queue deduplication proves end-to-end exactly-once effects.",
    "documented_statement": {
      "status": "documented",
      "statement": "SQS suppresses repeated sends within its documented deduplication interval. Content-based IDs use the message body rather than message attributes. This queue admission behaviour does not establish a transaction across the consumer and an external service, or protection for retries beyond that interval.",
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    "buyer_evidence_required": [
      "Deduplication mode and message-ID construction.",
      "Retry timing and body-versus-attribute use.",
      "Consumer-side commit and replay handling."
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      "status": "varexis_review_policy",
      "statement": "Do not equate duplicate-send suppression with atomic downstream processing."
    },
    "unknowns": "The buyer configuration, contract, effective entitlement and operational evidence have not been inspected. Missing evidence does not establish absence or failure of the feature.",
    "evidence_sources": [
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        "source_id": "sqs-fifo",
        "url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html",
        "final_url": "https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html",
        "title": "SQS FIFO deduplication",
        "checked_on": "2026-10-16",
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        "bytes": 14776
      }
    ],
    "observed_deployment": false,
    "commercial_reliance_boundary": "Procurement evidence support only; no supplier clearance, legal conclusion, configuration audit or verification of the buyer's claim is supplied.",
    "paid_value": {
      "decision_context": "Save the source basis for evaluating exactly-once claims in a queued service.",
      "free": "Complete review, practical questions, sources and limitations; may be saved locally.",
      "single_request": "Existing server-saved version-bound route snapshot for later authenticated retrieval.",
      "evidence_receipt": "The same snapshot plus the existing unsigned delivery receipt.",
      "excluded": [
        "Fresh vendor research",
        "Continuous monitoring or change alerts",
        "Testing the buyer configuration",
        "Private evidence or vendor certification"
      ],
      "integrity": "Hashes identify content versions; they do not prove truth or provide a signature."
    },
    "revalidation": {
      "trigger": "A saved purchase does not recheck the source or buyer configuration.",
      "specific_watch": "Deduplication configuration, message identity, retry interval and consumer transaction boundary."
    }
  },
  "paid_access_note": "The full published answer and boundaries are free. Paid access saves the selected route and source versions, with an unsigned receipt when purchased. Preview coverage before paying. Fresh research, bespoke assessment and protected evidence are excluded.",
  "service_route": {
    "request_guide": "/varexis-index/request.html",
    "request_workflow": "/varexis-index/request-workflow.json",
    "service_id": "single_request",
    "service_routes_url": "/varexis-index/service-routes.json",
    "payment_required": true,
    "availability_endpoint": "/api/index/capabilities",
    "operational_status": "AUTOMATIC_SERVICE_CAPABILITIES_GATED",
    "checkout_url": "/index-access"
  },
  "authority_boundary": "VAREXIS-INDEX informs evidence reliance. It does not provide advice, certification, deployment authority, security assurance, production approval, or guarantee.",
  "human_page": "/varexis-index/catalog.html#sqs-fifo-deduplication-business-effect",
  "machine_readable_record": "/varexis-index/records/sqs-fifo-deduplication-business-effect.json"
}