update to use request revisions

alembic/versions/a903ebe91ad5_add_sequence_to_request_revision.py

@@ -0,0 +1,28 @@
+"""add sequence to request revision
+
+Revision ID: a903ebe91ad5
+Revises: 04fe150da553
+Create Date: 2018-08-30 13:45:35.561657
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'a903ebe91ad5'
+down_revision = '04fe150da553'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    db = op.get_bind()
+    op.add_column('request_revisions', sa.Column('sequence', sa.BigInteger(), nullable=False))
+    db.execute("CREATE SEQUENCE request_revisions_sequence_seq OWNED BY request_revisions.sequence;")
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    op.drop_column('request_revisions', 'sequence')