feat: add query indexes for better database performance

- Add journal_entry_user_id_date_desc_index for efficient journal entry queries by user and date
- Update page_user_id_updated_at_desc_index to use proper descending order syntax
- These indexes will improve performance for:
  - Journal timeline queries (user_id + date desc)
  - Page pagination queries (user_id + updated_at desc)
  - User-specific data filtering and sorting operations

Author: rmolinamir

packages/db/src/core/journal-entry.schema.ts

@@ -1,5 +1,5 @@
 import { relations, sql } from "drizzle-orm";
-import { pgTable, text, unique } from "drizzle-orm/pg-core";
+import { index, pgTable, text, unique } from "drizzle-orm/pg-core";
 import { createSelectSchema } from "drizzle-zod";
 import z from "zod/v4";
 import { user } from "../auth/user.schema.js";
@@ -31,6 +31,7 @@ export const JournalEntry = pgTable(
   (t) => [
     // Enforce uniqueness: one journal entry per user per day
     unique("journal_entry_unique_user_date").on(t.user_id, t.date),
+    index("journal_entry_user_id_date_desc_index").on(t.user_id, t.date.desc()),
   ],
 );
 

packages/db/src/core/page.schema.ts

@@ -30,10 +30,9 @@ export const Page = pgTable(
       .$onUpdateFn(() => sql`now()`),
   }),
   (t) => [
-    index("page_user_id_updated_at_index").using(
-      "btree",
+    index("page_user_id_updated_at_desc_index").on(
       t.user_id,
-      t.updated_at,
+      t.updated_at.desc(),
     ),
   ],
 );