old_contents: from datetime import datetime, timedelta
  from inspect import isgenerator
  
  try:
      from collections import OrderedDict
  except ImportError:  # pragma: no cover
      from ordereddict import OrderedDict
  
  from sqlalchemy import Integer, UnicodeText, Float, DateTime, Boolean, types, Table, event
  
  
  def guess_type(sample):
      if isinstance(sample, bool):
          return Boolean
      elif isinstance(sample, int):
          return Integer
      elif isinstance(sample, float):
          return Float
      elif isinstance(sample, datetime):
          return DateTime
      return UnicodeText
  
  
  def convert_row(row):
      if row is None:
          return None
      return OrderedDict(row.items())
  
  
  class ResultIter(object):
      """ SQLAlchemy ResultProxies are not iterable to get a
      list of dictionaries. This is to wrap them. """
  
      def __init__(self, result_proxies):
          if not isgenerator(result_proxies):
              result_proxies = iter((result_proxies, ))
          self.result_proxies = result_proxies
          self.count = 0
          self._iter = None
  
      def _next_rp(self):
          try:
              rp = next(self.result_proxies)
              self.count += rp.rowcount
              self.keys = list(rp.keys())
              self._iter = iter(rp.fetchall())
              return True
          except StopIteration:
              return False
  
      def __next__(self):
          if self._iter is None:
              if not self._next_rp():
                  raise StopIteration
          try:
              return convert_row(next(self._iter))
          except StopIteration:
              self._iter = None
              return self.__next__()
  
      next = __next__
  
      def __iter__(self):
          return self
  
new_contents: from datetime import datetime
  from inspect import isgenerator
  
  try:
      from collections import OrderedDict
  except ImportError:  # pragma: no cover
      from ordereddict import OrderedDict
  
  from sqlalchemy import Integer, UnicodeText, Float, DateTime, Boolean
  
  
  def guess_type(sample):
      if isinstance(sample, bool):
          return Boolean
      elif isinstance(sample, int):
          return Integer
      elif isinstance(sample, float):
          return Float
      elif isinstance(sample, datetime):
          return DateTime
      return UnicodeText
  
  
  def convert_row(row):
      if row is None:
          return None
      return OrderedDict(row.items())
  
  
  class ResultIter(object):
      """ SQLAlchemy ResultProxies are not iterable to get a
      list of dictionaries. This is to wrap them. """
  
      def __init__(self, result_proxies):
          if not isgenerator(result_proxies):
              result_proxies = iter((result_proxies, ))
          self.result_proxies = result_proxies
          self.count = 0
          self._iter = None
  
      def _next_rp(self):
          try:
              rp = next(self.result_proxies)
              self.count += rp.rowcount
              self.keys = list(rp.keys())
              self._iter = iter(rp.fetchall())
              return True
          except StopIteration:
              return False
  
      def __next__(self):
          if self._iter is None:
              if not self._next_rp():
                  raise StopIteration
          try:
              return convert_row(next(self._iter))
          except StopIteration:
              self._iter = None
              return self.__next__()
  
      next = __next__
  
      def __iter__(self):
          return self
  
subject: Clean up imports.