From 9e99c0706aa791627fa8270673cbce026037d203 Mon Sep 17 00:00:00 2001
From: Joscha <joscha@plugh.de>
Date: Mon, 8 Aug 2022 17:32:25 +0200
Subject: [PATCH] Improve mark-older-as-unseen performance

---
 src/vault/euph.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/vault/euph.rs b/src/vault/euph.rs
index f9efb8f..f24ecd1 100644
--- a/src/vault/euph.rs
+++ b/src/vault/euph.rs
@@ -1222,15 +1222,13 @@ impl EuphRequest {
         id: Snowflake,
         seen: bool,
     ) -> rusqlite::Result<()> {
-        // TODO Speed up this update
-        // Maybe with an index on (room, id, seen) and a filter to only set seen
-        // where it isn't already set correctly?
         conn.execute(
             "
             UPDATE euph_msgs
             SET seen = :seen
             WHERE room = :room
             AND id <= :id
+            AND seen != :seen
             ",
             named_params! { ":room": room, ":id": id, ":seen": seen },
         )?;