Use ordered SQLite migrations (Refs #75)

tests/unit/host-capacity-calibration.test.ts

@@ -238,6 +238,7 @@ describe('measured instance capacity', () => {
         db().exec(
             'UPDATE ec_resource_allowances SET cpu_cores=cpu_cores*1.25, memory_bytes=memory_bytes*1.25'
         );
+        db().pragma('user_version = 0');
         closeDb();
         const { capacityCalibration } = await import('../../src/lib/server/hosts/calibration.js');
         expect(capacityCalibration(hostId)).toEqual(model);