remove duplicate col in training_data table

init.sql

@@ -15,7 +15,6 @@ create table if not exists training_data(
     altitude float not null,
     distance float not null,
     kcal int not null,
-    speed float not null,
     constraint fk_training_id foreign key(training_id) references training(id) on delete cascade
 );
 create index if not exists idx_training_data_training_id on training_data(training_id);