Add a button to keep forwarded messages

admin/migrations/versions/73e56bad5ec5_.py

@@ -0,0 +1,24 @@
+""" Add the ability to keep forwarded messages
+
+Revision ID: 73e56bad5ec5
+Revises: 3f6994568962
+Create Date: 2017-09-03 15:36:07.821002
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '73e56bad5ec5'
+down_revision = '3f6994568962'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    with op.batch_alter_table('user') as batch:
+        batch.add_column(sa.Column('forward_keep', sa.Boolean(), nullable=False, server_default=sa.sql.expression.true()))
+
+
+def downgrade():
+    with op.batch_alter_table('user') as batch:
+        batch.drop_column('forward_keep')