create_dynamo_table.rb

dynamodb = DynamoDB.instance
dynamodb.create_table({ 
  table_name: 'crawled_items',
  key_schema: [
    { attribute_name: 'original_url', key_type: 'HASH', },
    { attribute_name: 'taskgroup_id', key_type: 'RANGE', },
  ], 
  attribute_definitions: [ 
    { attribute_name: 'original_url', attribute_type: 'S', }, 
    { attribute_name: 'taskgroup_id', attribute_type: 'S', },
  ], 
  provisioned_throughput: { read_capacity_units: 1, write_capacity_units: 1, },
})