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ForeignKeyConstraint, courtesy Ryan Kelly. [ticket:2502] - [feature] Added support for DELETE and UPDATE from an alias of a table, which would assumedly be related to itself elsewhere in the query, courtesy Ryan Kelly. [ticket:2507] - [feature] Added support for the Postgresql ONLY keyword, which can appear corresponding to a table in a SELECT, UPDATE, or DELETE statement. The phrase is established using with_hint(). Courtesy Ryan Kelly [ticket:2506]