From 375efcefbdb9831b46e027f1a4816b7b2ec4070d Mon Sep 17 00:00:00 2001
From: nenikitov <nenikitov@mail.ru>
Date: Mon, 29 Sep 2025 12:16:59 -0400
Subject: [PATCH] feat: readd previous old generation skip

---
 src/libstore/profiles.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libstore/profiles.cc b/src/libstore/profiles.cc
index 311665d46..919398e0d 100644
--- a/src/libstore/profiles.cc
+++ b/src/libstore/profiles.cc
@@ -200,6 +200,12 @@ void deleteGenerationsFilter(
     if (olderThan.has_value()) {
         older = current;
         iterDropUntil(gens, older, [&](auto & g) { return g.creationTime < *olderThan; });
+        /* Take the previous generation
+
+           We don't want delete this one yet because it
+           existed at the requested point in time, and
+           we want to be able to roll back to it. */
+        iterDrop(gens, older);
     }
 
     // Find first generation to delete by clamping between keepMin and keepMax