Refactor permissions dao - removed custom query filter

Removed permissions rest - not being used.

migrations/versions/0030_service_id_not_null.py

@@ -0,0 +1,29 @@
+"""empty message
+
+Revision ID: 0030_service_id_not_null
+Revises: 0029_fix_email_from
+Create Date: 2016-06-15 15:51:41.355149
+
+"""
+
+# revision identifiers, used by Alembic.
+
+from sqlalchemy.dialects import postgresql
+
+revision = '0030_service_id_not_null'
+down_revision = '0029_fix_email_from'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.alter_column('permissions', 'service_id',
+               existing_type=postgresql.UUID(),
+               nullable=True)
+
+
+def downgrade():
+    op.alter_column('permissions', 'service_id',
+               existing_type=postgresql.UUID(),
+               nullable=False)