Since SQLite does not enforce foreign key constraints by default, neither does rqlite. However you can enable foreign key constraints in rqlite via the command line option `-fk=true`. Setting this command line will enable Foreign Key constraints on all connections that rqlite makes to the underlying SQLite database.
Issuing the `PRAGMA foreign_keys = boolean` command usually results in unpredictable behaviour, since rqlite doesn't offer connection-level control of the underlying SQLite database. It is not recommended.
