diff --git a/accountant/migrations/1232daf66ac_add_user_support.py b/accountant/migrations/1232daf66ac_add_user_support.py
index 259ac8d..180d383 100644
--- a/accountant/migrations/1232daf66ac_add_user_support.py
+++ b/accountant/migrations/1232daf66ac_add_user_support.py
@@ -6,15 +6,22 @@ Create Date: 2015-08-31 10:24:40.578432
 
 """
 
-# revision identifiers, used by Alembic.
-revision = '1232daf66ac' # flake8: noqa
-down_revision = '144929e0f5f' # flake8: noqa
+# pylint: disable=no-member
 
-from alembic import op
-import sqlalchemy as sa
+# revision identifiers, used by Alembic.
+# pylint: disable=invalid-name
+revision = '1232daf66ac'
+down_revision = '144929e0f5f'
+# pylint: enable=invalid-name
+
+# pylint: disable=wrong-import-position
+from alembic import op  # noqa
+import sqlalchemy as sa  # noqa
+# pylint: enable=wrong-import-position
 
 
 def upgrade():
+    """Upgrades for revision 1232daf66ac"""
     op.create_table(
         'user',
         sa.Column('id', sa.Integer(), nullable=False),
@@ -28,5 +35,6 @@ def upgrade():
 
 
 def downgrade():
+    """Downgrades for revision 1232daf66ac"""
     op.drop_index(op.f('ix_user_email'), table_name='user')
     op.drop_table('user')
diff --git a/accountant/migrations/144929e0f5f_improve_operation_scheduling.py b/accountant/migrations/144929e0f5f_improve_operation_scheduling.py
index baeb912..49783c2 100644
--- a/accountant/migrations/144929e0f5f_improve_operation_scheduling.py
+++ b/accountant/migrations/144929e0f5f_improve_operation_scheduling.py
@@ -6,17 +6,24 @@ Create Date: 2015-07-17 15:04:01.002581
 
 """
 
+# pylint: disable=no-member
+
 # revision identifiers, used by Alembic.
-revision = '144929e0f5f' # flake8: noqa
-down_revision = None # flake8: noqa
+# pylint: disable=invalid-name
+revision = '144929e0f5f'
+down_revision = None
+# pylint: enable=invalid-name
 
-from alembic import op
-import sqlalchemy as sa
+# pylint: disable=wrong-import-position
+from alembic import op  # noqa
+import sqlalchemy as sa  # noqa
 
-from accountant.models.scheduled_operations import ScheduledOperation
+from accountant.models.scheduled_operations import ScheduledOperation  # noqa
+# pylint: enable=wrong-import-position
 
 
 def upgrade():
+    """Upgrades for revision 144929e0f5f"""
     op.get_bind().execute("DROP VIEW operation")
     op.rename_table('entry', 'operation')
 
@@ -51,18 +58,15 @@ def upgrade():
         "alter sequence entry_id_seq rename to operation_id_seq"
     )
 
-    connection = op.get_bind()
-    Session = sa.orm.sessionmaker()
-    session = Session(bind=connection)
-
     # Get all scheduled operations
-    scheduled_operations = ScheduledOperation.query(session).all()
+    scheduled_operations = ScheduledOperation.query().all()
 
     for scheduled_operation in scheduled_operations:
-        scheduled_operation.reschedule(session)
+        scheduled_operation.reschedule()
 
 
 def downgrade():
+    """Downgrades for revision 144929e0f5f"""
 
     op.create_table(
         "canceled_operation",
@@ -81,6 +85,7 @@ def downgrade():
     )
     op.rename_table('operation', 'entry')
 
+    # pylint: disable=line-too-long
     op.get_bind().execute(
         """
 CREATE VIEW operation AS
@@ -138,5 +143,6 @@ SELECT NULL::bigint AS id,
     true AS canceled
 FROM scheduled_operation
 JOIN canceled_operation ON canceled_operation.scheduled_operation_id = scheduled_operation.id;
-        """ # flake8: noqa
+        """  # noqa
     )
+    # pylint: enable=line-too-long