Hi, I'm new to this language and to it's database bindings.

I've found an issue that seems a bit problematic to what I'm currently 
developing.

Running a database pragma on db_sqlite's interface results in an error like 
this:
    
    
    Traceback (most recent call last)
    error_replicate.nim(5)   error_replicate
    db_sqlite.nim(138)       exec
    db_sqlite.nim(104)       dbError
    Error: unhandled exception: unknown error [DbError]
    

This seems to be a minimal test case to generate this outcome.
    
    
    import db_sqlite
    
    var db=open("local.db",nil,nil,nil)
    
    db.exec(sql"pragma journal_mode=wal")
    db.close()
    

Executing the same command on a database written to by nim's bindings works 
properly and allows the program to use WAL instead of the delete-journal(which 
is very slow).

I suspect that the more primitive sqlite3 module would allow me to execute this 
properly, but I'd rather not have to resort to that.

Is this actually a bug? Or is the return value that sqlite returns after the 
query is executed the trigger for the exception?

Anyway, I'm on the git version of the nim compiler and libraries on antergos 
linux.

I'd really appreciate some pointers in dealing with this, as while it's fairly 
easy to fix manually, it's a pain when developing my program. Thanks.

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