How to use the memorious.core.session function in memorious

op.name = context.stage.name
            op.run_id = context.run_id
            op.status = Operation.STATUS_PENDING
            session.add(op)
            session.commit()

            context.operation_id = op.id

            try:
                context.log.info('Running: %s', op.name)
                res = func(context, data, *a, **kw)
                op.status = Operation.STATUS_SUCCESS
                return res
            except Exception as exc:
                # this should clear results and tags created by this op
                session.rollback()
                Event.save(op.id, Event.LEVEL_ERROR, exc=exc)
                context.log.exception(exc)
            finally:
                if op.status == Operation.STATUS_PENDING:
                    op.status = Operation.STATUS_FAILED
                op.ended_at = datetime.utcnow()
                session.add(op)
                session.commit()

def func_wrapper(context, data, *a, **kw):
            op = Operation()
            op.crawler = context.crawler.name
            op.name = context.stage.name
            op.run_id = context.run_id
            op.status = Operation.STATUS_PENDING
            session.add(op)
            session.commit()

            context.operation_id = op.id

            try:
                context.log.info('Running: %s', op.name)
                res = func(context, data, *a, **kw)
                op.status = Operation.STATUS_SUCCESS
                return res
            except Exception as exc:
                # this should clear results and tags created by this op
                session.rollback()
                Event.save(op.id, Event.LEVEL_ERROR, exc=exc)
                context.log.exception(exc)
            finally:
                if op.status == Operation.STATUS_PENDING:

def run_migrations_online():
    connection = session.bind.connect()
    context.configure(connection=connection,
                      target_metadata=target_metadata,
                      include_object=ignore_autogen)

    try:
        with context.begin_transaction():
            context.run_migrations()
    finally:
        connection.close()

def save(cls, crawler, prev_stage, next_stage, data):
        obj = cls()
        obj.crawler = crawler.name
        obj.prev_stage = prev_stage
        obj.next_stage = next_stage
        obj.data = data
        session.add(obj)
        return obj

from __future__ import with_statement
from alembic import context

from memorious.core import session
from memorious.model import Base

config = context.config
config.set_main_option('script_location', '.')
target_metadata = Base.metadata
target_metadata.bind = session.bind


def ignore_autogen(obj, name, type_, reflexted, compare_to):
    if type_ == 'table' and name.startswith('tabular_'):
        return False
    return True


def run_migrations_offline():
    url = config.get_main_option("sqlalchemy.url")
    context.configure(url=url,
                      include_object=ignore_autogen)

    with context.begin_transaction():
        context.run_migrations()