New field code_blocks

{
  "schema_fingerprint.metadata_keys": [
    "can_save",
    "citations",
    "code_blocks",
    "content_references",
    "cot_version",
    "default_model_slug",
    "finish_details",
    "finished_duration_sec",
    "is_complete",
    "is_visually_hidden_from_conversation",
    "message_source",
    "message_type",
    "model_slug",
    "model_switcher_deny",
    "parent_id",
    "reasoning_end_time",
    "reasoning_recap_type",
    "reasoning_start_time",
    "reasoning_status",
    "rebase_developer_message",
    "request_id",
    "resolved_model_slug",
    "search_result_groups",
    "selected_sources",
    "serialization_metadata",
    "story_events",
    "thinking_effort",
    "turn_exchange_id",
    "working_turn_id"
  ]
}