From e66b26347b0acb28e742ccdc8571edc020abc357 Mon Sep 17 00:00:00 2001
From: Jason Dove <1695733+jasongdove@users.noreply.github.com>
Date: Wed, 29 Oct 2025 13:55:01 -0500
Subject: [PATCH] fix block history when using mirror offset

---
 CHANGELOG.md                                                  | 2 ++
 ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs | 4 ++--
 .../Scheduling/BlockScheduling/BlockPlayoutBuilder.cs         | 2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87618223b..072c2379e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Fix HLS Direct playback with Jellyfin 10.11
 - Fix remote stream scripts (parsing issue with spaces and quotes)
+- Fix block history being removed when it is still needed for mirror channel
+  - This caused playout build errors like "Unable to locate history for playout item"
 
 ## [25.8.0] - 2025-10-26
 ### Added
diff --git a/ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs b/ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs
index ec4d86a64..f6ea6b8db 100644
--- a/ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs
+++ b/ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs
@@ -367,8 +367,8 @@ public class BuildPlayoutHandler : IRequestHandler<BuildPlayout, Either<BaseErro
         {
             try
             {
-                await dbContext.PlayoutBuildStatus.AddAsync(newBuildStatus, cancellationToken);
-                await dbContext.SaveChangesAsync(cancellationToken);
+                await dbContext.PlayoutBuildStatus.AddAsync(newBuildStatus, CancellationToken.None);
+                await dbContext.SaveChangesAsync(CancellationToken.None);
             }
             catch (Exception)
             {
diff --git a/ErsatzTV.Core/Scheduling/BlockScheduling/BlockPlayoutBuilder.cs b/ErsatzTV.Core/Scheduling/BlockScheduling/BlockPlayoutBuilder.cs
index 3829f71b7..2076ed696 100644
--- a/ErsatzTV.Core/Scheduling/BlockScheduling/BlockPlayoutBuilder.cs
+++ b/ErsatzTV.Core/Scheduling/BlockScheduling/BlockPlayoutBuilder.cs
@@ -397,7 +397,7 @@ public class BlockPlayoutBuilder(
         IEnumerable<PlayoutHistory> allItemsToDelete = referenceData.PlayoutHistory
             .GroupBy(h => h.Key)
             .SelectMany(group => group
-                .Filter(h => h.Finish < start.UtcDateTime)
+                .Filter(h => h.Finish < start.UtcDateTime - referenceData.MaxPlayoutOffset)
                 .OrderByDescending(h => h.Finish)
                 .Tail());