Catalog Table

A DynamoDB 24 table declares only its key; other attributes vary freely per item. BookNest's key is the numeric id, a partition (HASH) key alone, so GetItem fetches one book and Scan reads all six:

  BooksTable:
    Type: AWS::DynamoDB::Table
    DeletionPolicy: Retain
    UpdateReplacePolicy: Retain
    Properties:
      TableName: booknest-books
      BillingMode: PAY_PER_REQUEST
      AttributeDefinitions: [{AttributeName: id, AttributeType: N}]
      KeySchema: [{AttributeName: id, KeyType: HASH}]
      PointInTimeRecoverySpecification: {PointInTimeRecoveryEnabled: true}

On-demand billing (PAY_PER_REQUEST) suits small, spiky traffic; PROVISIONED suits steady, forecastable load. Point-in-time recovery keeps continuous backups over a period of 1 to 35 days. The Retain policies keep the catalog through stack deletion or replacement (Deletion Policies), as cfn-guard's guard rule requires. A Scan suits six items; a large catalog would add a global secondary index on genre and Query it.