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CREATE OR REPLACE FUNCTION truncate_tables(username IN VARCHAR) RETURNS void AS $$
DECLARE
    statements CURSOR FOR
    SELECT tablename FROM pg_tables
    WHERE tableowner = username AND schemaname = 'public';
BEGIN
  FOR stmt IN statements LOOP
    EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.tablename) || ' CASCADE;';
  END LOOP;
END;
$$ LANGUAGE plpgsql;