class_docstr: Construct a SQLite database with a folder of notebooks
code: def __init__(self, path_to_db, pattern):
      self._path_to_db = path_to_db
      self._pattern = pattern
  
      self._conn = sqlite3.connect(self._path_to_db)
  
      cur = self._conn.cursor()
      cur.execute(
          """
          CREATE TABLE IF NOT EXISTS nbs (
              created TIMESTAMP default current_timestamp,
              path TEXT NOT NULL PRIMARY KEY,
              c TEXT
          )
          """
      )
      cur.close()
  
file_path: sklearn-evaluation/src/sklearn_evaluation/nb/NotebookDatabase.py
imports: import json
  import sqlite3
  from glob import iglob
  from .NotebookIntrospector import NotebookIntrospector
label_desc: Use image node_id 1 to create a new NotebookDatabase object  with example: obj = NotebookDatabase(path_to_db, pattern)