code: def __init__(self, url, echo=False, priority=DEFAULT_SQL_PRIORITY):
      from sqlalchemy.orm import sessionmaker, scoped_session
      import sqlalchemy as sa
  
      engine = sa.create_engine(url, echo=echo)
      session_factory = sessionmaker(bind=engine)
      # make session thread-local to avoid problems with sqlite (see #275)
      session = scoped_session(session_factory)
      self.engine = engine
      self.session = session
      self.priority = priority
      self.run = None
      self.lock = Lock()
  
imports: import json
  from threading import Lock
  import warnings
  from sacred.commandline_options import cli_option
  from sacred.observers.base import RunObserver
  from sacred.serializer import flatten
label_desc: Use image node_id 2 to create a new SqlObserver object from inherited base classes: RunObserver with example: obj = SqlObserver(url, echo, priority)