I am working on 1 user facing web based application in public domain and as a db i was looking for managed database solutions (i looked at MongoDB solutions but they are very expensive > ~20$ a month) so i was thinking of hosting it myself with Digital Ocean. (Btw this product will be free so no plans of earning from it, hence idea is to get cheaper db i don't have any preference for DB but with mongo i can easily structure the data (saving python dict))

Today i came across Google Cloud Datastore (https://cloud.google.com/datastore/), it seems like a good solution and its affordable for my needs but i am not able to find much about it on net. has anyone used this DB? any issues / features i should be aware of before spending my time evaluating for my needs? [i need to write adapter for this DB which could take significant time but it will be good in long run]