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diff --git a/src/mailman/database/alembic/versions/7c5b39d1ecc4_workflow_steps.py b/src/mailman/database/alembic/versions/7c5b39d1ecc4_workflow_steps.py
new file mode 100644
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+++ b/src/mailman/database/alembic/versions/7c5b39d1ecc4_workflow_steps.py
@@ -0,0 +1,90 @@
+# Copyright (C) 2015-2017 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Save whole workflow stack in workflowstate.
+
+Revision ID: 7c5b39d1ecc4
+Revises: 4bd95c99b2e7
+Create Date: 2017-07-04 16:45:36.470746
+
+"""
+
+import json
+import sqlalchemy as sa
+
+from alembic import op
+from mailman.database.types import SAUnicode
+
+# revision identifiers, used by Alembic.
+revision = '7c5b39d1ecc4'
+down_revision = '4bd95c99b2e7'
+
+old_state_table = sa.sql.table(
+        'workflowstate',
+        sa.sql.column('token', SAUnicode),
+        sa.sql.column('step', SAUnicode),
+        sa.sql.column('data', SAUnicode)
+        )
+new_state_table = sa.sql.table(
+        'workflowstate',
+        sa.sql.column('token', SAUnicode),
+        sa.sql.column('steps', SAUnicode),
+        sa.sql.column('data', SAUnicode)
+        )
+
+
+def upgrade():
+    # Rename the column
+    with op.batch_alter_table('workflowstate') as batch_op:
+        batch_op.alter_column('step', new_column_name='steps',
+                              existing_type=SAUnicode)
+
+    connection = op.get_bind()
+    for token, step, data in connection.execute(
+            new_state_table.select()).fetchall():
+        # Wrap the single step in a JSON array.
+        if step is not None:
+            new_steps = json.dumps([step])
+        else:
+            new_steps = '[]'
+        connection.execute(
+                new_state_table.update().where(
+                        new_state_table.c.token == token).values(
+                        steps=new_steps)
+                        )
+
+
+def downgrade():
+    # Rename back the column
+    connection = op.get_bind()
+    with op.batch_alter_table('workflowstate') as batch_op:
+        batch_op.alter_column('steps', new_column_name='step',
+                              existing_type=SAUnicode)
+
+    for token, steps, data in connection.execute(
+            old_state_table.select()).fetchall():
+        # Extract and save at least the last state.
+        step_stack = json.loads(steps)
+        if len(step_stack) == 0:
+            new_step = None
+        else:
+            new_step = step_stack.pop()
+        connection.execute(
+                old_state_table.update().where(
+                        old_state_table.c.token == token).values(
+                        step=new_step)
+                        )