add oauth client description

jupyterhub/alembic/versions/d68c98b66cd4_client_description.py

@@ -0,0 +1,29 @@
+"""client-description
+
+Revision ID: d68c98b66cd4
+Revises: 99a28a4418e1
+Create Date: 2018-04-13 10:50:17.968636
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'd68c98b66cd4'
+down_revision = '99a28a4418e1'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    tables = op.get_bind().engine.table_names()
+    if 'oauth_clients' in tables:
+        op.add_column(
+            'oauth_clients',
+            sa.Column('description', sa.Unicode(length=1023))
+        )
+
+
+def downgrade():
+    op.drop_column('oauth_clients', 'description')

jupyterhub/orm.py

@@ -486,6 +486,7 @@ class OAuthClient(Base):
     __tablename__ = 'oauth_clients'
     id = Column(Integer, primary_key=True, autoincrement=True)
     identifier = Column(Unicode(255), unique=True)
+    description = Column(Unicode(1023))
     secret = Column(Unicode(255))
     redirect_uri = Column(Unicode(1023))