KoduStore (nuget): KoduStore makes marries objects and LevelDB UWP in a delightful way. It's a really basic document store with support for primary and secondary index support; this will solve most of your problems. Right now it's a PCL (for UWP).
Keywords: leveldb|uwp|database|store|storage|orm|mapper|kodu|kodustore|key-value|key|value|pcl