You're seeing just the function describe_table-exclamation-mark, go back to Ecto.Adapters.DynamoDB.Cache module for more information.
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describe_table!(repo, table_name)

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describe_table!(Ecto.Repo.t(), table_name_t()) ::
  dynamo_response_t() | no_return()

Returns the cached value for a call to DynamoDB, describe-table. Performs a DynamoDB scan if not yet cached and raises any errors as a result of the request. The raw json is presented as an elixir map.