type instead of medium

init.sql

@@ -2,7 +2,7 @@ create table if not exists training(
     id uuid primary key default gen_random_uuid(),
     owner varchar(255) not null,
     filename text not null,
-    medium varchar(255) not null,
+    type varchar(255) not null,
     description text not null,
     moving_time float not null,
     stopped_time float not null,