diff --git a/lib/DB.rakumod b/lib/DB.rakumod
index fd70f73..0085d70 100644
--- a/lib/DB.rakumod
+++ b/lib/DB.rakumod
@@ -41,6 +41,6 @@ class MarkdownPost does Post is json {
 
 #| The top level posts database
 class PostDB is json(:pretty) {
-   #| The inner list of posts
-   has Post:D @.posts = [];
+   #| A mapping from post ids to posts
+   has Hash[Int:D, Post:D] %.posts = %();
 }