Ali Dorri wrote:
> I encode the PKs to base64
> [...]
> The PK is a BLOB type, i.e.,
>    sql = "CREATE TABLE BC("  \
>                 "PK            BLOB    ," \

Why do you store a text value in a blob field?

> "UPDATE BC set Signature = null  and PK = null   where PK = '%q' ;

That does not update the PK column.

   UPDATE BC set Signature = null ,    PK = null   where PK = '%q' ;
                                  ^^^^

Regards,
Clemens
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