Add application_id column to AuditEvent

Use application_id and portfolio_id if the resource is a portfolio in AuditableMixin
Clean up some residual references to workspace

alembic/versions/c5deba1826be_add_appliction_id_to_auditevent.py

@@ -0,0 +1,32 @@
+"""add_appliction_id_to_auditevent
+
+Revision ID: c5deba1826be
+Revises: 404bb5bb3a0e
+Create Date: 2019-05-15 16:30:27.981456
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'c5deba1826be'
+down_revision = '404bb5bb3a0e'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('audit_events', sa.Column('application_id', postgresql.UUID(as_uuid=True), nullable=True))
+    op.create_index(op.f('ix_audit_events_application_id'), 'audit_events', ['application_id'], unique=False)
+    op.create_foreign_key('audit_events_application_application_id', 'audit_events', 'applications', ['application_id'], ['id'])
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint('audit_events_application_application_id', 'audit_events', type_='foreignkey')
+    op.drop_index(op.f('ix_audit_events_application_id'), table_name='audit_events')
+    op.drop_column('audit_events', 'application_id')
+    # ### end Alembic commands ###