record expiration time on the invitation

alembic/versions/e62bcc460c26_add_expiration_time_to_invitation.py

@@ -0,0 +1,28 @@
+"""add expiration_time to invitation
+
+Revision ID: e62bcc460c26
+Revises: 03654d08f5ff
+Create Date: 2018-10-26 13:37:39.015003
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'e62bcc460c26'
+down_revision = '03654d08f5ff'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('invitations', sa.Column('expiration_time', sa.TIMESTAMP(timezone=True), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('invitations', 'expiration_time')
+    # ### end Alembic commands ###