RecordReader/Writer with nested json resulting in MapRecord[] statement

[Aaron Rich]

Hello,

I'm trying to use the record writer/writers to take a json defined event
and write it to postgres database. The event follows the CloudEvent
definition and has a data element that is JSON structured:

{
  "data" : {
    "message_type" : "V5",
    "message_time" : "1614597071000",
    "file_ingest_time": "1682018983320"
  },
  "spec_version" : "1.0.2",
  "subject" : "1969",
  "data_schema" : "URI://something",
  "id" : "80e12364-831e-446a-a260-86bccc469f25",
  "source" : "service",
  "time" : "2023-11-22T00:03:03Z",
  "type" : "V5",
  "data_content_type" : "application/json"
}

I'm trying to write into a postgres db table that has each field as a
column and data as a JSON type column.

When I try to write the the database with PutDatabaseRecord, I'm getting
MapRecord sting that is trying to be written into the data column:
MapRecord[{message_type=V5,
message_time=1614597071000,file_ingest_time=1682018983320}]

I _think_ the issue is with the schema I'm defining:
{
 "type": "record",

 "name": "eventSchema0",

 "fields" : [
    {"name":"data", "type": "string"},
    {"name":"spec_version", "type": "string"},
    {"name":"subject", "type": "string"},
    {"name":"data_schema", "type": "string"},
    {"name":"id", "type": "string"},
    {"name":"source", "type": "string"},
    {"name":"time", "type": "string"},
    {"name":"type", "type": "string"},
    {"name":"data_content_type", "type": "string"}
]

}

What do I need to change so the JSON structure in the "data" field can be
properly written using a record based processor?

Thanks for the help.

-Aaron