old_contents: from __future__ import with_statement
  
  import os
  from logging.config import fileConfig
  
  from alembic import context
  from sqlalchemy import engine_from_config, pool
  
  
  config = context.config
  fileConfig(config.config_file_name)
  
  
  def run_migrations_offline():
      """
      Run migrations in 'offline' mode.
  
      This configures the context with just a URL
      and not an Engine, though an Engine is acceptable
      here as well.  By skipping the Engine creation
      we don't even need a DBAPI to be available.
  
      Calls to context.execute() here emit the given string to the
      script output.
      """
  
      url = config.get_main_option("sqlalchemy.url")
      context.configure(url=url, target_metadata=None, literal_binds=True)
  
      with context.begin_transaction():
          context.run_migrations()
  
  
  def run_migrations_online():
      """
      Run migrations in 'online' mode.
  
      In this scenario we need to create an Engine
      and associate a connection with the context.
      """
  
      sqlalchemy_config = config.get_section(config.config_ini_section)
      sqlalchemy_config['sqlalchemy.url'] = os.environ['DATABASE_URI']
  
      connectable = engine_from_config(sqlalchemy_config,
                                       prefix='sqlalchemy.',
                                       poolclass=pool.NullPool)
  
      with connectable.connect() as connection:
          context.configure(connection=connection, target_metadata=None)
  
          with context.begin_transaction():
              context.run_migrations()
  
  
  if context.is_offline_mode():
      run_migrations_offline()
  else:
      run_migrations_online()
  
new_contents: from __future__ import with_statement
  
  import os
  from logging.config import fileConfig
  
  from alembic import context
  from sqlalchemy import engine_from_config, pool
  
  
  config = context.config
  fileConfig(config.config_file_name)
  
  
  def run_migrations_offline():
      """
      Run migrations in 'offline' mode.
  
      This configures the context with just a URL
      and not an Engine, though an Engine is acceptable
      here as well.  By skipping the Engine creation
      we don't even need a DBAPI to be available.
  
      Calls to context.execute() here emit the given string to the
      script output.
      """
  
      url = config.get_main_option("sqlalchemy.url")
      context.configure(url=url, target_metadata=None, literal_binds=True)
  
      with context.begin_transaction():
          context.run_migrations()
  
  
  def run_migrations_online():
      """
      Run migrations in 'online' mode.
  
      In this scenario we need to create an Engine
      and associate a connection with the context.
      """
  
      sqlalchemy_config = config.get_section(config.config_ini_section)
      sqlalchemy_config['sqlalchemy.url'] = os.environ['DATABASE_URL']
  
      connectable = engine_from_config(sqlalchemy_config,
                                       prefix='sqlalchemy.',
                                       poolclass=pool.NullPool)
  
      with connectable.connect() as connection:
          context.configure(connection=connection, target_metadata=None)
  
          with context.begin_transaction():
              context.run_migrations()
  
  
  if context.is_offline_mode():
      run_migrations_offline()
  else:
      run_migrations_online()
  
subject: Fix alembic database URL