Changed fields sns — adapters/changed-fields-sns

# Compare previous/current in the verified original JSON. Arrays compare as
# JSON.stringify values, including object member order, and emit one array path.
# status.* changes also emit status. Empty results omit the SNS String.Array.
server: {addr: ":8080", max_body_bytes: 1048576}
destinations: {broker: {type: sns, sns: {region: us-east-1}}}
flows:
  sample:
    nodes:
      - {id: in, type: http_trigger, path: /webhooks/changes/sample, methods: [POST]}
      - {id: body, type: read_body, max_bytes: 1048576}
      - {id: auth, type: auth, scheme: exact, secret_ref: {provider: env, name: SAMPLE_INGRESS_TOKEN}, signature_header: X-Api-Key}
      - {id: env, type: envelope}
      - {id: diff, type: transform, kind: changed_fields_js, from: body.previous, to: body.current, name: fields_changed}
      - id: send
        type: publish
        destination: broker
        target: synthetic-change-events.fifo
        wire_body: json
        fifo:
          group_id: {source: body, path: event_id}
          deduplication_id: {source: body, path: event_id}
        message_attributes:
          fields_changed: {data_type: String.Array, value: "{fields_changed}", omit_if_empty: true}
    edges: [in>body, body>auth, auth>env, env>diff, diff>send]