fix(react-db): include peek-ahead item in useLiveInfiniteQuery initial query

.changeset/fix-infinite-query-peek-ahead.md

@@ -0,0 +1,7 @@
+---
+"@tanstack/react-db": patch
+---
+
+fix(react-db): include peek-ahead item in useLiveInfiniteQuery initial query
+
+The initial query was fetching exactly `pageSize` items, but the peek-ahead logic requires `pageSize + 1` to determine if more pages exist. This caused `hasNextPage` to incorrectly return `false` on initial load when using SQLite predicate push-down with `syncMode: "on-demand"`.

packages/react-db/src/useLiveInfiniteQuery.ts

@@ -184,10 +184,11 @@ export function useLiveInfiniteQuery<TContext extends Context>(
 
   // Create a live query with initial limit and offset
   // Either pass collection directly or wrap query function
+  // Use pageSize + 1 for the initial limit to include the peek-ahead item
   const queryResult = isCollection
     ? useLiveQuery(queryFnOrCollection)
     : useLiveQuery(
-        (q) => queryFnOrCollection(q).limit(pageSize).offset(0),
+        (q) => queryFnOrCollection(q).limit(pageSize + 1).offset(0),
         deps,
       )