[web2py] standalone DAL: why is migration table name preceeded by some prefix ?

[Stef Mientki]

hello,

I use the following statement to create a standalone DAT table

    DB.define_table ( Name, *Fields, migrate = 'Afdeling.table' )

Why is the name of the migration table prefixed ?

    9ca3bd6f71b92b953cff7d3c148b42fc_Afdeling.table

thanks,
Stef Mientki