What was the date of appointment for the manager of lecce when the previous manager's contract expired?
CREATE TABLE "managerial_changes" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text
);
SELECT "date_of_appointment" FROM "managerial_changes" WHERE "manner_of_departure"='contract expired' AND "team"='lecce';