The PostgreSQL Project today released minor versions updating all active branches of the PostgreSQL object-relational database system, including versions 8.4.2, 8.3.9, 8.2.15, 8.1.19, 8.0.23, and 7.4.27.

When you apply Row Level Security to a table, which has constraints, like a primary key or a unique constraint, then these constraints are evealuated regardless of the RLS policy. Of course this makes sense, especially in the case of a primary key, but it can be a problem with a unique constraint.

Read the entire article at: http://bar-solutions.com/wordpress/?p=10