Table schema:
CREATE TABLE table_name_3 (date_of_appointment VARCHAR, position_in_table VARCHAR, replaced_by VARCHAR)

Question: WHAT IS THE APPOINTMENT DATE WITH A PRE-SEASON POSITION, AND REPLACED BY THOMAS THOMASBERG?
SQL: SELECT date_of_appointment FROM table_name_3 WHERE position_in_table = "pre-season" AND replaced_by = "thomas thomasberg"