Use ordered SQLite migrations (Refs #75)

tests/unit/autoscaling-policies.test.ts

@@ -136,6 +136,7 @@ it.each(['dry-run', 'create-only'])('turns saved %s policies off once on upgrade
             "UPDATE autoscaling_policies SET mode=?,settings=json_set(settings,'$.mode',?) WHERE id=?"
         )
         .run(mode, mode, saved.id);
+    db().pragma('user_version = 0');
     closeDb();
     const migrated = scaling.getScalingPolicy(saved.id)!;
     expect(migrated).toMatchObject({
@@ -177,6 +178,7 @@ it.each([false, true])(
             db()
                 .prepare('UPDATE server_deployments SET submitted_at=? WHERE id=?')
                 .run(new Date().toISOString(), id);
+        db().pragma('user_version = 0');
         closeDb();
         expect(scaling.getScalingPolicy(saved.id)?.mode).toBe('off');
         expect(
@@ -211,6 +213,7 @@ it('removes saved cooldowns on upgrade without changing the empty hold or pausin
             "UPDATE autoscaling_policies SET next_action_at=?,settings=json_set(settings,'$.cooldownMinutes',60) WHERE id=?"
         )
         .run(Date.now() + 3600_000, saved.id);
+    db().pragma('user_version = 0');
     closeDb();
     const restored = scaling.getScalingPolicy(saved.id)!;
     expect(restored).toEqual(saved);