New fields: has_versions, paragen_ui_treatment, paragen_variants_info, rebase_system_message

{
  "schema_fingerprint.metadata_keys": [
    "can_save",
    "citations",
    "content_references",
    "cot_version",
    "debug_sonic_thread_id",
    "default_model_slug",
    "disable_turn_actions",
    "finish_details",
    "finished_duration_sec",
    "genui_components",
    "has_versions",
    "hide_inline_actions",
    "inline_cot_expandable_content",
    "is_complete",
    "is_visually_hidden_from_conversation",
    "message_source",
    "message_type",
    "model_dil_feedback",
    "model_dil_v2",
    "model_slug",
    "model_switcher_deny",
    "paragen_ui_treatment",
    "paragen_variants_info",
    "parent_id",
    "reasoning_end_time",
    "reasoning_recap_type",
    "reasoning_start_time",
    "reasoning_status",
    "reasoning_title",
    "reasoning_title_content_transition",
    "reasoning_titles",
    "rebase_developer_message",
    "rebase_system_message",
    "request_id",
    "resolved_model_slug",
    "safe_urls",
    "search_model_queries",
    "search_result_groups",
    "selected_sources",
    "serialization_metadata",
    "story_events",
    "tool_icons",
    "tool_summary_type",
    "turn_exchange_id",
    "view_state",
    "working_turn_id"
  ]
}