What is the lowest amount of points held by the Epperly Indy roadster in 1959?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT MIN("points") FROM "complete_formula_one_world_championship_" WHERE "chassis"='epperly indy roadster' AND "year"=1959;