Which is the earliest founded day school to have entered the competition after 1958?
CREATE TABLE "current_member_schools" (
  "school" text,
  "location" text,
  "enrolment" real,
  "founded" real,
  "denomination" text,
  "boys_girls" text,
  "day_boarding" text,
  "year_entered_competition" real
);
SELECT MIN("founded") FROM "current_member_schools" WHERE "day_boarding"='day' AND "year_entered_competition">1958;