Add appliance table, and probe "location" in that context

rattail_tempmon/db/alembic/versions/796084026e5b_add_appliance.py

@@ -0,0 +1,49 @@
+# -*- coding: utf-8; -*-
+"""add appliance
+
+Revision ID: 796084026e5b
+Revises: b02c531caca5
+Create Date: 2018-10-19 17:28:34.146307
+
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+# revision identifiers, used by Alembic.
+revision = '796084026e5b'
+down_revision = u'b02c531caca5'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # appliance
+    op.create_table('appliance',
+                    sa.Column('uuid', sa.String(length=32), nullable=False),
+                    sa.Column('name', sa.String(length=255), nullable=False),
+                    sa.Column('location', sa.String(length=255), nullable=True),
+                    sa.PrimaryKeyConstraint('uuid'),
+                    sa.UniqueConstraint('name', name=u'appliance_uq_name')
+    )
+
+    # probe
+    op.add_column(u'probe', sa.Column('appliance_uuid', sa.String(length=32), nullable=True))
+    op.add_column(u'probe', sa.Column('location', sa.String(length=255), nullable=True))
+    op.create_foreign_key(u'probe_fk_appliance', 'probe', 'appliance', ['appliance_uuid'], ['uuid'])
+
+
+def downgrade():
+
+    # probe
+    op.drop_constraint(u'probe_fk_appliance', 'probe', type_='foreignkey')
+    op.drop_column(u'probe', 'location')
+    op.drop_column(u'probe', 'appliance_uuid')
+
+    # appliance
+    op.drop_table('appliance')