Which you can effectively accomplish in PostgreSQL with SAVEPOINTs. In fact, with those, you can have arbitrarily complicated nesting of "transactions", though

Which you can effectively accomplish in PostgreSQL with SAVEPOINTs. In fact, with those, you can have arbitrarily complicated nesting of "transactions", though that does start to smell a bit like a foot-gun pretty quickly. http://www.postgresql.org/docs/current/static/sql-savepoint.html http://www.postgresql.org/docs/current/static/sql-savepoint....