From d16ab1f23860d2175d558ec0f882ae2f88f932ba Mon Sep 17 00:00:00 2001
From: Adrian D'souza <adrdsouza@gmail.com>
Date: Fri, 9 Oct 2026 00:05:52 +0530
Subject: [PATCH] PR218: check SQLite local payload span

Co-authored-by: Codex <noreply@openai.com>
---
 crates/engine/src/lightroom_sqlite.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/engine/src/lightroom_sqlite.rs b/crates/engine/src/lightroom_sqlite.rs
index 70f69a943..255725223 100644
--- a/crates/engine/src/lightroom_sqlite.rs
+++ b/crates/engine/src/lightroom_sqlite.rs
@@ -284,7 +284,7 @@ impl Database {
         let local = if payload_len <= max_local {
             payload_len
         } else {
-            let span = usable - 4;
+            let span = usable.checked_sub(4).ok_or("SQLite usable page size is too small")?;
             let candidate = min_local.saturating_add(payload_len.checked_sub(min_local).ok_or("SQLite payload length is too small")? % span);
             if candidate > max_local { min_local } else { candidate }
         };