first exam iteration

dbschema.sql

@@ -78,3 +78,26 @@ create table states
     fsrs_open_day integer           not null
 );
 
+create table exams
+(
+    id        INTEGER
+        primary key autoincrement,
+    timestamp INTEGER,
+    deck_id   INTEGER not null
+        references decks
+            on delete cascade
+);
+
+create table exam_entries
+(
+    id      INTEGER
+        primary key autoincrement,
+    exam_id INTEGER not null
+        references exams
+            on delete cascade,
+    word_id INTEGER not null
+        references words
+            on delete cascade,
+    status  INTEGER default null
+);
+