lmao schema change

README.md

@@ -1,3 +1,6 @@
 # tmtd
 
-(too much) To Do
+(too much) To Do
+
+## Database schema versioning
+**Warning**: currently, the database schema is *unstable*, meaning that it can change any time and break everything. Be warned.

src/sql/schema.sql

@@ -20,9 +20,9 @@ create table if not exists tasks(
     id serial primary key,
     name varchar(128) not null,
     description varchar(32768) not null,
-    author integer references users(id) not null,
-    assignee integer references users(id) not null,
-    category integer references categories(id) not null,
+    author integer references users(id),
+    assignee integer references users(id),
+    category integer not null references categories(id) on delete cascade,
     created timestamp not null,
     deadline timestamp
 )