[
  {
    "mode": "NULLABLE", 
    "name": "new_user_id", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "shuffle", 
    "type": "BOOLEAN"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "os", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "repeat_play", 
    "type": "BOOLEAN"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "device_type", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "message", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "version", 
    "type": "INTEGER"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "user_id", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "track_id", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "completion_flag", 
    "type": "BOOLEAN"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "timestamp", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "country", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "content_type_flag", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "cached", 
    "type": "BOOLEAN"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "offline_timestamp", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "source_uri", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "source", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "utc_timestamp_offset", 
    "type": "STRING"
  }, 
  {
    "mode": "NULLABLE", 
    "name": "length", 
    "type": "INTEGER"
  }
]