From 6174fd28c4c7311aafdf5ea22427c80725faafac Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Mon, 2 Nov 2026 11:20:30 +0100
Subject: remake: read ops, not diffs

This gives bench_replay a speedup of ~8x/64x/280x.
---
 src/remake/bench.rs | 3 ++-
 src/remake/delta.rs | 9 ++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/remake/bench.rs b/src/remake/bench.rs
index 3c3f513..f262601 100644
--- a/src/remake/bench.rs
+++ b/src/remake/bench.rs
@@ -3,7 +3,8 @@
 //! `replay`: carrying writes over into a new epoch's document, last writer wins
 //! (`delta::replay_newest`): what a rejoin does with the writes made during it, and a
 //! switch with those made after the remake's base. It finds the paths of every write
-//! carried, and of every newer change in the new document, by a diff each.
+//! carried, and of every newer change in the new document, from its operations
+//! (`store::changed_by`).
 
 use std::time::Instant;
 
diff --git a/src/remake/delta.rs b/src/remake/delta.rs
index 2c6c93d..638231c 100644
--- a/src/remake/delta.rs
+++ b/src/remake/delta.rs
@@ -163,16 +163,15 @@ fn between(doc: &Document, before: &[ChangeHash], after: &[ChangeHash]) -> Vec<C
     found.into_iter().collect()
 }
 
-/// For each of `changes` (in `doc`), its time and the store paths it touched.
+/// For each of `changes` (in `doc`), its time and the store paths it touched, from its
+/// operations (`store::changed_by`: a diff per change would cost what the maps it
+/// touched hold, `remake::bench`).
 fn touched(doc: &Document, changes: &[ChangeHash]) -> Vec<(i64, Vec<Vec<String>>)> {
     changes
         .iter()
         .filter_map(|hash| {
             let change = doc.get_change_by_hash(hash)?;
-            let paths = store::changed(doc, change.deps(), &[*hash], InLists::Whole)
-                .into_iter()
-                .map(|changed| changed.path)
-                .collect();
+            let paths = store::changed_by(doc, hash, InLists::Whole)?;
             Some((change.timestamp(), paths))
         })
         .collect()
-- 
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