Implement users in API

src/database/models/ids.rs

@@ -77,9 +77,16 @@ generate_ids!(
     pub generate_state_id,
     StateId,
     8,
-    "SELECT EXISTS(SELECT 1 FROM mods WHERE id=$1)",
+    "SELECT EXISTS(SELECT 1 FROM states WHERE id=$1)",
     StateId
 );
+generate_ids!(
+    pub generate_user_id,
+    UserId,
+    8,
+    "SELECT EXISTS(SELECT 1 FROM users WHERE id=$1)",
+    UserId
+);
 
 #[derive(Copy, Clone, Debug, Type)]
 #[sqlx(transparent)]