[airbreather]

sql light, source available, in c.

Don't know if it would fit your platform, but if it doesn't you could argue it doesn't need it, or maybe the database is off board?

[catsareok]

Sqlite3 blows. Worked it for years. It has caching and flash burn issues and also is just the worst “language” when it comes to schema updates and general use.

[airbreather]

Seems very popular for something so problematic.