add active_extensions stub to alembic scaffold

edbob/scaffolds/edbob/+package+/alembic/script.py.mako

@@ -24,8 +24,20 @@ active_extensions = sa.Table(
 
 
 def upgrade():
-    ${upgrades if upgrades else "pass"}
+    ${upgrades if upgrades else 'pass'}
+
+    # active extensions
+
+    # op.execute(
+    #     active_extensions.insert().values(
+    #         name='dummy'))
 
 
 def downgrade():
-    ${downgrades if downgrades else "pass"}
+    ${downgrades if downgrades else 'pass'}
+
+    # active extensions
+
+    # op.execute(
+    #     active_extensions.delete().where(
+    #         active_extensions.c.name == 'dummy'))