old_contents: import logging
  import blinker
  
  from web_ui import db, app
  
  from sqlalchemy.orm import sessionmaker
  
  ERROR = {
      "MISSING_MESSAGE_TYPE": (1, "No message type found."),
      "MISSING_PAYLOAD": (2, "No data payload found."),
      "OBJECT_NOT_FOUND": lambda name: (3, "Object does not exist: ".format(name)),
      "MISSING_KEY": lambda name: (4, "Missing data for this request: {}".format(name)),
      "INVALID_SIGNATURE": (5, "Invalid signature."),
      "INVALID_SESSION": (6, "Session invalid. Please re-authenticate."),
      "DUPLICATE_ID": lambda id: (7, "Duplicate ID: {}".format(id)),
      "SOUMA_NOT_FOUND": lambda id: (8, "Souma not found: {}".format(id)),
      "MISSING_PARAMETER": lambda name: (9, "Missing HTTP parameter: {}".format(name)),
  }
  
  # Setup Blinker namespace
  notification_signals = blinker.Namespace()
  
  # Setup logger namespace
  logger = logging.getLogger('nucleus')
  
  # Source formatting helper
  source_format = lambda address: None if address is None else \
      "{host}:{port}".format(host=address[0], port=address[1])
  
  # Possible states of stars
  STAR_STATES = {
      -2: (-2, "deleted"),
      -1: (-1, "unavailable"),
      0: (0, "published"),
      1: (1, "draft"),
      2: (2, "private"),
      3: (3, "updating")
  }
  
  # Possible states of planets
  PLANET_STATES = {
      -1: (-1, "unavailable"),
      0: (0, "published"),
      1: (1, "private"),
      2: (2, "updating")
  }
  
  # Possible states of 1ups
  ONEUP_STATES = {
      -1: "disabled",
      0: "active",
      1: "unknown author"
  }
  
  CHANGE_TYPES = ("insert", "update", "delete")
  
  
  class InvalidSignatureError(Exception):
      """Throw this error when a signature fails authenticity checks"""
      pass
  
  
  class PersonaNotFoundError(Exception):
      """Throw this error when the Persona profile specified for an action is not available"""
      pass
  
  
  class UnauthorizedError(Exception):
      """Throw this error when the active Persona is not authorized for an action"""
      pass
  
  
  class VesicleStateError(Exception):
      """Throw this error when a Vesicle's state does not allow for an action"""
      pass
  
  
  # Import at bottom to avoid circular imports
  # Import all models to allow querying db binds
  from nucleus.models import *
  from vesicle import Vesicle
  
  # _Session is a custom sessionmaker that returns a session prefconfigured with the
  # model bindings from Nucleus
  _Session = sessionmaker(bind=db.get_engine(app))
  
  
  def create_session():
      """Return a session to be used for database connections
  
      Returns:
          Session: SQLAlchemy session object
      """
      # Produces integrity errors!
      # return _Session()
  
      # db.session is managed by Flask-SQLAlchemy and bound to a request
      return db.session
  
new_contents: import logging
  import blinker
  
  from web_ui import db, app
  
  from sqlalchemy.orm import sessionmaker
  
  ERROR = {
      "MISSING_MESSAGE_TYPE": (1, "No message type found."),
      "MISSING_PAYLOAD": (2, "No data payload found."),
      "OBJECT_NOT_FOUND": lambda name: (3, "Object does not exist: ".format(name)),
      "MISSING_KEY": lambda name: (4, "Missing data for this request: {}".format(name)),
      "INVALID_SIGNATURE": (5, "Invalid signature."),
      "INVALID_SESSION": (6, "Session invalid. Please re-authenticate."),
      "DUPLICATE_ID": lambda id: (7, "Duplicate ID: {}".format(id)),
      "SOUMA_NOT_FOUND": lambda id: (8, "Souma not found: {}".format(id)),
      "MISSING_PARAMETER": lambda name: (9, "Missing HTTP parameter: {}".format(name)),
  }
  
  # Setup Blinker namespace
  notification_signals = blinker.Namespace()
  
  # Setup logger namespace
  logger = logging.getLogger('nucleus')
  
  # Source formatting helper
  source_format = lambda address: None if address is None else \
      "{host}:{port}".format(host=address[0], port=address[1])
  
  # Possible states of stars
  STAR_STATES = {
      -2: (-2, "deleted"),
      -1: (-1, "unavailable"),
      0: (0, "published"),
      1: (1, "draft"),
      2: (2, "private"),
      3: (3, "updating")
  }
  
  # Possible states of planets
  PLANET_STATES = {
      -1: (-1, "unavailable"),
      0: (0, "published"),
      1: (1, "private"),
      2: (2, "updating")
  }
  
  # Possible states of 1ups
  ONEUP_STATES = {
      -1: "disabled",
      0: "active",
      1: "unknown author"
  }
  
  CHANGE_TYPES = ("insert", "update", "delete")
  
  
  class InvalidSignatureError(Exception):
      """Throw this error when a signature fails authenticity checks"""
      pass
  
  
  class PersonaNotFoundError(Exception):
      """Throw this error when the Persona profile specified for an action is not available"""
      pass
  
  
  class UnauthorizedError(Exception):
      """Throw this error when the active Persona is not authorized for an action"""
      pass
  
  
  class VesicleStateError(Exception):
      """Throw this error when a Vesicle's state does not allow for an action"""
      pass
  
  
  # Import at bottom to avoid circular imports
  # Import all models to allow querying db binds
  from .models import *
  from vesicle import Vesicle
  
  # _Session is a custom sessionmaker that returns a session prefconfigured with the
  # model bindings from Nucleus
  _Session = sessionmaker(bind=db.get_engine(app))
  
  
  def create_session():
      """Return a session to be used for database connections
  
      Returns:
          Session: SQLAlchemy session object
      """
      # Produces integrity errors!
      # return _Session()
  
      # db.session is managed by Flask-SQLAlchemy and bound to a request
      return db.session
  
subject: Fix import