From 976d1ff0a00bf9aff5b07eaf4927d9a943d1a580 Mon Sep 17 00:00:00 2001
From: LilianBoulard <lilian@boulard.fr>
Date: Sun, 11 Jan 2026 16:33:21 +0100
Subject: [PATCH 1/3] Set order by to fix undefined behavior

---
 server/controllers/posts.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/controllers/posts.ts b/server/controllers/posts.ts
index 7dabe18..2b61bd5 100644
--- a/server/controllers/posts.ts
+++ b/server/controllers/posts.ts
@@ -104,6 +104,7 @@ export async function random(query: string | null = null): Promise<PostSummary |
     const post: { id: number } | null = await db.queryFirst(SQL`
       SELECT id
       FROM posts
+      ORDER BY id
       OFFSET floor(random() * (SELECT posts FROM global))
       LIMIT 1
     `);

From 3ca87f439b0f87656120104cdf7ff8cd28d84317 Mon Sep 17 00:00:00 2001
From: LilianBoulard <lilian@boulard.fr>
Date: Sun, 11 Jan 2026 16:35:15 +0100
Subject: [PATCH 2/3] Fix RNG

---
 server/controllers/posts.ts | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/server/controllers/posts.ts b/server/controllers/posts.ts
index 2b61bd5..b8367f0 100644
--- a/server/controllers/posts.ts
+++ b/server/controllers/posts.ts
@@ -112,9 +112,26 @@ export async function random(query: string | null = null): Promise<PostSummary |
     id = post?.id || null;
   } else {
     const key = getCacheKey(query);
-    const cachePage = await getCachedPosts(key);
-    
-    id = cachePage.posts[Math.floor(Math.random() * cachePage.posts.length)] || null;
+
+    key.offset = 0;
+    const firstPage = await getCachedPosts(key);
+    const total = firstPage.total;
+
+    if(total === 0) {
+      id = null;
+    } else {
+      // Pick a random position across the entire result set
+      const randomPosition = Math.floor(Math.random() * total);
+
+      // Calculate which cache page contains this position
+      const cacheStart = Math.floor(randomPosition / CACHE_SIZE) * CACHE_SIZE;
+      key.offset = cacheStart;
+      const cachePage = await getCachedPosts(key);
+
+      // Get the post at the random position within this page
+      const indexInPage = randomPosition - cacheStart;
+      id = cachePage.posts[indexInPage] || null;
+    }
   }
   
   const post: PostSummary | null = await db.queryFirst(SQL`

From ae9cca9ffd21408bcffcde880c6f876c47d66dd5 Mon Sep 17 00:00:00 2001
From: Lilian <lilian@boulard.fr>
Date: Mon, 12 Jan 2026 19:33:24 +0100
Subject: [PATCH 3/3] Remove ORDER_BY

---
 server/controllers/posts.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/server/controllers/posts.ts b/server/controllers/posts.ts
index b8367f0..15918da 100644
--- a/server/controllers/posts.ts
+++ b/server/controllers/posts.ts
@@ -104,7 +104,6 @@ export async function random(query: string | null = null): Promise<PostSummary |
     const post: { id: number } | null = await db.queryFirst(SQL`
       SELECT id
       FROM posts
-      ORDER BY id
       OFFSET floor(random() * (SELECT posts FROM global))
       LIMIT 1
     `);