Postgres, Oracle and FireBird: computed columns

[Thorium]

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Computed columns should be excluded from insert clause when calling strongly-typed (column-listed) .Create(...) methods. This is already working in MySQL and SQL Server, but Oracle, Postgres and Firebird is still missing this feature.

Basically when the database schema is read, a Boolean column should be populated in here (Postgres) and here (Oracle) and here (Firebird).