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Access to system tables is now more restrictive for non-admin users (the tables can be still listed and read, but some of the data is not included).

The default expression of a column may no longer reference the table, because a database with such a table couldn't be opened normally.

Referenced objects in check constraints could be dropped, which resulted in a database that can't be opened normally.

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The auto-server mode can't be combined with an in-memory database. This invalid combination wasn't detected so far. Now trying to open a database in this way fails.