When is the became heir; reason when heir is hsinbyushin?
CREATE TABLE "list_of_heirs_to_the_burmese_thrones" (
  "monarch" text,
  "heir" text,
  "status" text,
  "relationship_to_monarch" text,
  "became_heir_reason" text,
  "ceased_to_be_heir_reason" text,
  "next_in_succession" text
);
SELECT "became_heir_reason" FROM "list_of_heirs_to_the_burmese_thrones" WHERE "heir"='Hsinbyushin';