code: def close(self):
      # Close all connections - useful to avoid running out of file handles in tests
      for connection in self._all_file_connections:
          connection.close()
  
imports: import asyncio
  from collections import namedtuple
  from pathlib import Path
  import hashlib
  import janus
  import queue
  import sys
  import threading
  import uuid
  from .tracer import trace
  from .utils import detect_fts, detect_primary_keys, detect_spatialite, get_all_foreign_keys, get_outbound_foreign_keys, sqlite_timelimit, sqlite3, table_columns, table_column_details
  from .inspect import inspect_hash
label_desc: Use image node_id 6 for calling the Database obj's underlying member method code with example usage: obj.close() without return types