better searching for the file

allstarr/Services/Spotify/SpotifyMissingTracksFetcher.cs

@@ -296,18 +296,35 @@ public class SpotifyMissingTracksFetcher : BackgroundService
         }
 
         _logger.LogInformation("Processing {Count} playlists", _playlistIdToName.Count);
+        
+        // Track when we find files to optimize search for other playlists
+        DateTime? firstFoundTime = null;
+        var foundPlaylists = new HashSet<string>();
+        
         foreach (var kvp in _playlistIdToName)
         {
             _logger.LogInformation("Fetching playlist: {Name}", kvp.Value);
-            await FetchPlaylistMissingTracksAsync(kvp.Value, cancellationToken);
+            var foundTime = await FetchPlaylistMissingTracksAsync(kvp.Value, cancellationToken, firstFoundTime);
+            
+            if (foundTime.HasValue)
+            {
+                foundPlaylists.Add(kvp.Value);
+                if (!firstFoundTime.HasValue)
+                {
+                    firstFoundTime = foundTime;
+                    _logger.LogInformation("  → Will search within ±1h of {Time:yyyy-MM-dd HH:mm} for remaining playlists", firstFoundTime.Value);
+                }
+            }
         }
         
-        _logger.LogInformation("=== FINISHED FETCHING MISSING TRACKS ===");
+        _logger.LogInformation("=== FINISHED FETCHING MISSING TRACKS ({Found}/{Total} playlists found) ===", 
+            foundPlaylists.Count, _playlistIdToName.Count);
     }
 
-    private async Task FetchPlaylistMissingTracksAsync(
+    private async Task<DateTime?> FetchPlaylistMissingTracksAsync(
         string playlistName,
-        CancellationToken cancellationToken)
+        CancellationToken cancellationToken,
+        DateTime? hintTime = null)
     {
         var cacheKey = $"spotify:missing:{playlistName}";
         
@@ -337,7 +354,7 @@ public class SpotifyMissingTracksFetcher : BackgroundService
         if (string.IsNullOrEmpty(jellyfinUrl) || string.IsNullOrEmpty(apiKey))
         {
             _logger.LogWarning("  Jellyfin URL or API key not configured, skipping fetch");
-            return;
+            return null;
         }
         
         var httpClient = _httpClientFactory.CreateClient();
@@ -351,6 +368,46 @@ public class SpotifyMissingTracksFetcher : BackgroundService
         var found = false;
         DateTime? foundFileTime = null;
         
+        // If we have a hint time from another playlist, search ±1 hour around it first
+        if (hintTime.HasValue)
+        {
+            _logger.LogInformation("  Hint: Searching ±1h around {Time:yyyy-MM-dd HH:mm} (from another playlist)", hintTime.Value);
+            
+            // Search ±60 minutes around the hint time
+            for (var minuteOffset = 0; minuteOffset <= 60; minuteOffset++)
+            {
+                if (cancellationToken.IsCancellationRequested) break;
+
+                // Try both forward and backward from hint
+                if (minuteOffset > 0)
+                {
+                    // Try forward
+                    var timeForward = hintTime.Value.AddMinutes(minuteOffset);
+                    var resultForward = await TryFetchMissingTracksFile(playlistName, timeForward, jellyfinUrl, apiKey, httpClient, cancellationToken);
+                    if (resultForward.found)
+                    {
+                        found = true;
+                        foundFileTime = resultForward.fileTime;
+                        _logger.LogInformation("  ✓ Found using hint (+{Minutes}min from hint)", minuteOffset);
+                        return foundFileTime;
+                    }
+                }
+                
+                // Try backward
+                var timeBackward = hintTime.Value.AddMinutes(-minuteOffset);
+                var resultBackward = await TryFetchMissingTracksFile(playlistName, timeBackward, jellyfinUrl, apiKey, httpClient, cancellationToken);
+                if (resultBackward.found)
+                {
+                    found = true;
+                    foundFileTime = resultBackward.fileTime;
+                    _logger.LogInformation("  ✓ Found using hint (-{Minutes}min from hint)", minuteOffset);
+                    return foundFileTime;
+                }
+            }
+            
+            _logger.LogInformation("  Not found within ±1h of hint, doing full search...");
+        }
+        
         // First search forward 24 hours (most likely to find newest files with timezone ahead)
         _logger.LogInformation("  Phase 1: Searching forward 24 hours...");
         
@@ -365,7 +422,7 @@ public class SpotifyMissingTracksFetcher : BackgroundService
             {
                 found = true;
                 foundFileTime = result.fileTime;
-                break; // Found newest file, stop searching
+                return foundFileTime;
             }
             
             // Small delay every 60 requests to avoid rate limiting
@@ -391,7 +448,7 @@ public class SpotifyMissingTracksFetcher : BackgroundService
                 {
                     found = true;
                     foundFileTime = result.fileTime;
-                    break;
+                    return foundFileTime;
                 }
                 
                 // Small delay every 60 requests to avoid rate limiting
@@ -438,10 +495,8 @@ public class SpotifyMissingTracksFetcher : BackgroundService
                 _logger.LogWarning("  No existing cache to keep - playlist will be empty until tracks are found");
             }
         }
-        else if (foundFileTime.HasValue)
-        {
-            _logger.LogInformation("  ✓ Updated cache with newer file from {Time}", foundFileTime.Value);
-        }
+        
+        return foundFileTime;
     }
 
     private async Task<(bool found, DateTime? fileTime)> TryFetchMissingTracksFile(