The DuckDB UI stores notebook content in an internal database called _duckdb_ui. You can query and export notebook content, as well as insert new definitions into the database. Warning: Modifying the internal database may lead to corruption and data loss. Be cautious and use it at your own risk!

export-notebook-definition.sql

copy (
  select
    "json"
  from _duckdb_ui.notebook_versions
  where 1=1
    and title = 'MySingleNotebook'
    and expires is null
) to 'exported-notebook.json';

import-notebook-definition.sql

set variable notebook_content = (select json from 'exported-notebook.json');
set variable notebook_id = uuid();
set variable current_timestamp = now();

begin transaction;
  insert into _duckdb_ui.notebooks (id, name, created)
  select
    getvariable('notebook_id'),
    'notebook_' || getvariable('notebook_id'),
    getvariable('current_timestamp')
  ;

  insert into _duckdb_ui.notebook_versions (notebook_id, version, title, json, created, expires)
  select
    getvariable('notebook_id'),
    1,
    'imported-notebook-' || getvariable('current_timestamp'),
    getvariable('notebook_content'),
    getvariable('current_timestamp'),
    null
  ;
commit;