refresh_tokens: add app inside each refresh token

crates/database/migrations/20230318135414_refresh_tokens.up.sql

@@ -4,6 +4,7 @@ create table if not exists refresh_tokens
     token      TEXT not null primary key,
     ip_address TEXT not null,
     user       TEXT not null references users (id),
+    app        TEXT not null references apps (id),
 
     -- timings
     created_at TEXT not null default CURRENT_TIMESTAMP,