Take off the final comma:
"INSERT INTO audit (member_id, date_time, table, field, old_value, new_value) VALUES (@member_id, @date_time, @table, @field, @old_value, @new_value,)"
Becomes:
"INSERT INTO audit (member_id, date_time, table, field, old_value, new_value) VALUES (@member_id, @date_time, @table, @field, @old_value, @new_value)"