old_contents: import flask
  import tasks
  import numpy
  
  
  BROKER_URL = 'amqp://guest:guest@localhost:5672//'
  
  flask_app = flask.Flask(__name__)
  flask_app.config.update(
      CELERY_BROKER_URL=BROKER_URL,
      CELERY_RESULT_BACKEND=BROKER_URL
  )
  celery = tasks.make_celery(flask_app)
  
  
  @flask_app.route("/")
  def main(name=None):
      return flask.render_template('main.html', name=name)
  
  
  @flask_app.route("/history")
  def history():
      # return flask.render_template('history.html', name=name)
      return "TODO"
  
  
  @celery.task()
  def sort_until_done(integers):
      import time
      time.sleep(5)
      return sorted(integers)
  
  
  def get_from_db():
      #TODO
      return []
  
  
  def next_list(n):
      return list(range(1, n+1))
  
  
  def powers_of_ten(start=1, end=7):
      return map(lambda n: 10**n, range(start, end))
  
  
  def restart_from_previous_known_state():
      sequence = get_from_db()
      bogo(sequence)
  
  
  def bogo(sequence=None):
      prev_ten_exponent = int(numpy.log10(len(sequence))) if sequence else 1
      is_restarting = sequence is not None
  
      for length in powers_of_ten(prev_ten_exponent, 7):
          if is_restarting:
              is_restarting = False
          else:
              sequence = next_list(length)
          result = sort_until_done.delay(sequence)
          result.wait()
  
  
  
  if __name__ == "__main__":
      if not celery.current_task:
          restart_from_previous_known_state()
  
new_contents: import os.path
  import sqlite3
  import flask
  import tasks
  import math
  import random
  import ast
  import datetime
  
  
  BROKER_URL = 'amqp://guest:guest@localhost:5672//'
  DATABASE_NAME = 'app.db'
  RANDOM_SEED = 1148599
  random.seed(RANDOM_SEED)
  
  flask_app = flask.Flask(__name__)
  flask_app.config.update(
      DATABASE=os.path.join(flask_app.root_path, DATABASE_NAME),
      CELERY_BROKER_URL=BROKER_URL,
      CELERY_RESULT_BACKEND=BROKER_URL
  )
  celery = tasks.make_celery(flask_app)
  
  
  APP_CONTEXT_DATABASE_NAME = "_" + DATABASE_NAME.replace(".", "_")
  DATABASE_SCHEMA = "schema.sql"
  
  
  @flask_app.route("/")
  def main(name=None):
      return flask.render_template('main.html', name=name)
  
  
  @flask_app.route("/history")
  def history():
      # return flask.render_template('history.html', name=name)
      return "TODO"
  
  
  @celery.task()
  def sort_until_done(integers):
      import time
      time.sleep(5)
      return sorted(integers)
  
  
  def connect_db():
      connection = sqlite3.connect(flask_app.config['DATABASE'])
      connection.row_factory = sqlite3.Row
      return connection
  
  
  def get_db():
      if not hasattr(flask.g, APP_CONTEXT_DATABASE_NAME):
          setattr(flask.g, APP_CONTEXT_DATABASE_NAME, connect_db())
      return getattr(flask.g, APP_CONTEXT_DATABASE_NAME)
  
  
  @flask_app.teardown_appcontext
  def close_db(error):
      if hasattr(flask.g, APP_CONTEXT_DATABASE_NAME):
          getattr(flask.g, APP_CONTEXT_DATABASE_NAME).close()
  
  
  def init_db():
      db = get_db()
      with flask_app.open_resource(DATABASE_SCHEMA, mode='r') as schema:
          db.cursor().executescript(schema.read())
      db.commit()
  
  
  @flask_app.cli.command('initdb')
  def initdb_command():
      print("Initializing database, existing tables will be dropped.")
      if input("Are you sure? (Y)\n").lower() == "y":
          init_db()
          print("Database initialized")
      else:
          print("Cancelled")
  
  
  def get_previous_state_from_db():
      db = get_db()
      query = "select sequence, random_state from backups order by id desc"
      return db.execute(query).fetchone()
  
  
  def backup_sorting_state(sequence):
      db = get_db()
      query = "insert into backups (sequence, random_state, saved) values (?, ?, ?)"
      backup_data = (
          repr(sequence),
          repr(random.getstate()),
          datetime.date.today().isoformat()
      )
      db.execute(query, backup_data)
      db.commit()
  
  
  def next_list(n):
      return list(range(1, n+1))
  
  
  def powers_of_ten(start=1, end=7):
      return map(lambda n: 10**n, range(start, end))
  
  
  def restart_from_previous_known_state():
      row = get_previous_state_from_db()
      sequence, random_module_state = tuple(map(ast.literal_eval, row))
  
      random.seed(RANDOM_SEED)
      random.setstate(random_module_state)
      bogo(sequence)
  
  
  def bogo(sequence=None):
      prev_ten_exponent = int(math.log10(len(sequence))) if sequence else 1
      is_restarting = sequence is not None
  
      for length in powers_of_ten(prev_ten_exponent, 7):
          if is_restarting:
              is_restarting = False
          else:
              sequence = next_list(length)
  
          result = sort_until_done.delay(sequence)
          result.wait()
  
  
  if __name__ == "__main__":
      if not celery.current_task:
          restart_from_previous_known_state()
  
  
subject: implement database connection logic