MentDB Weak is also a NoSQL database type key/json. It allows you to manipulate JSON nodes, sequences. It is an ACID database. You can cut the electricity at any time, the blocks will reassemble by themselves.
A.C.I.D. File System for MentDB NoSQL part
Log file rolling
Synchronous or asynchronous
Stat / Metric
Single configuration file
Node JSON storage
Full embedded mode (with H2 Database) or not (MySQL) for SQL part