add migration script

migrations/versions/2020_022314_903ec5f566e8_.py

@@ -0,0 +1,33 @@
+"""empty message
+
+Revision ID: 903ec5f566e8
+Revises: 3fa3a648c8e7
+Create Date: 2020-02-23 14:11:46.332532
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '903ec5f566e8'
+down_revision = '3fa3a648c8e7'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('mailbox', sa.Column('new_email', sa.String(length=256), nullable=True))
+    op.create_unique_constraint(None, 'mailbox', ['new_email'])
+    op.add_column('users', sa.Column('full_mailbox', sa.Boolean(), server_default='0', nullable=False))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('users', 'full_mailbox')
+    op.drop_constraint(None, 'mailbox', type_='unique')
+    op.drop_column('mailbox', 'new_email')
+    # ### end Alembic commands ###