reformat custom fields table. will return to this topic later

sql/history.sql

@@ -1,12 +1,12 @@
 create table history
 (
-    id INTEGER
+    id        integer
         primary key autoincrement,
-    deck_id INTEGER not null references decks on delete cascade,
-    word_id INTEGER not null references words on delete cascade,
-    timestamp INTEGER not null,
-    answer INTEGER not null,
-    before INTEGER not null,
-    after INTEGER not null,
-    fsrs INTEGER not null
+    deck_id   integer not null references decks on delete cascade,
+    word_id   integer not null references words on delete cascade,
+    timestamp integer not null,
+    answer    integer not null,
+    before    integer not null,
+    after     integer not null,
+    fsrs      integer not null
 );