code: def hash(self):
      if self.cached_hash is not None:
          return self.cached_hash
      elif self.is_mutable or self.is_memory:
          return None
      elif self.ds.inspect_data and self.ds.inspect_data.get(self.name):
          self.cached_hash = self.ds.inspect_data[self.name]["hash"]
          return self.cached_hash
      else:
          p = Path(self.path)
          self.cached_hash = inspect_hash(p)
          return self.cached_hash
  
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 8 for calling the Database obj's underlying member method code with example usage: obj.hash() and returns: self, None, self, self