Hello,

Dmitry presented at the conference some things (AFAIK e.g. changing NULL 
to NOT NULL and vice versa) in Firebird 3, which replaces the need for 
directly updating the system tables, as this might be disallowed in FB 3 
anyway. He asked for additional use cases, which currently need direct 
system table updates. Here are two:

- Changing the owner of database objects, which hold the owner 
information and everything additional needed for the conversion (e.g. 
SQL privileges etc ...)

- Support for the inserting SYSDBA role trick, although I'm not sure if 
this is still important due to the new authentication plugin mechanism


Regards,
Thomas

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