fix: sessions api with next engine (#3009)

* fix: sessions api with next engine

* regen openapi

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Fix health checks causing a flood of (harmless) logged errors when quickly navigating away from home page
   - Health check results will now be cached for 5 minutes by default; a refresh button has been added to immediately re-run all checks
+- Fix `/api/sessions` response when channels use Next streaming engine
 
 ## [26.9.0] - 2026-09-06
 ### Fixed

ErsatzTV.Application/Streaming/NextSessionWorker.cs

@@ -87,15 +87,21 @@ public class NextSessionWorker(
 
     public Task<Option<TrimPlaylistResult>> TrimPlaylist(
         DateTimeOffset filterBefore,
-        CancellationToken cancellationToken) =>
-        throw new NotSupportedException();
+        CancellationToken cancellationToken)
+    {
+        logger.LogWarning(
+            "Legacy path called for next session worker on channel {Number}; this is NOT supported",
+            _channelNumber);
+
+        return Task.FromResult(Option<TrimPlaylistResult>.None);
+    }
 
     public void PlayoutUpdated()
     {
         // nothing to do here; channel binary should detect that by itself
     }
 
-    public HlsSessionModel GetModel() => throw new NotSupportedException();
+    public HlsSessionModel GetModel() => new(_channelNumber, "next", null, _lastTouch);
 
     public async Task Run(
         string channelNumber,

ErsatzTV.Core/FFmpeg/HlsSessionModel.cs

@@ -3,5 +3,5 @@ namespace ErsatzTV.Core.FFmpeg;
 public record HlsSessionModel(
     string ChannelNumber,
     string State,
-    DateTimeOffset TranscodedUntil,
+    DateTimeOffset? TranscodedUntil,
     DateTimeOffset LastAccess);

ErsatzTV/wwwroot/openapi/scripted-schedule-tagged.json

@@ -1569,7 +1569,7 @@
           },
           "groupBy": {
             "type": "string",
-            "description": "Tells the scheduler how to group the combined content (returned from all guids and searches). Valid values are show, season, artist and album."
+            "description": "Tells the scheduler how to group the combined content (returned from all guids and searches). Valid values are show, season, artist, album and director."
           },
           "itemOrder": {
             "type": "string",

ErsatzTV/wwwroot/openapi/scripted-schedule.json

@@ -1569,7 +1569,7 @@
           },
           "groupBy": {
             "type": "string",
-            "description": "Tells the scheduler how to group the combined content (returned from all guids and searches). Valid values are show, season, artist and album."
+            "description": "Tells the scheduler how to group the combined content (returned from all guids and searches). Valid values are show, season, artist, album and director."
           },
           "itemOrder": {
             "type": "string",

ErsatzTV/wwwroot/openapi/v1.json

@@ -1074,7 +1074,10 @@
             ]
           },
           "transcodedUntil": {
-            "type": "string",
+            "type": [
+              "null",
+              "string"
+            ],
             "format": "date-time"
           },
           "lastAccess": {