The Mobile-Edge Computing standard promises co-locating edge servers with mobile phone base stations. Web services running on this new ecosystem will have to address the challenges of this new model in order to see its benefits. In this work, we briefly discuss design guidelines for scaling strongly consistent geo-distributed databases to the MEC environment. Following these guidelines, we present the design of a MEC database tailored for a specific kind of web services and a protocol for ensuring transactional non-monotonic snapshot isolation (NMSI) at MEC scale.