rename tables

sql/history.sql

@@ -2,10 +2,11 @@ create table history
 (
     id INTEGER
         primary key autoincrement,
-    set_id INTEGER not null references card_set on delete cascade,
-    stat_id INTEGER not null references card_stats on delete cascade,
+    set_id INTEGER not null references decks on delete cascade,
+    stat_id INTEGER not null references states on delete cascade,
     timestamp INTEGER not null,
     answer INTEGER not null,
     before INTEGER not null,
-    after INTEGER not null
+    after INTEGER not null,
+    fsrs INTEGER not null
 );