Flush uploaded hashes after backup; remove chunk exists check

Added a flush of pending uploaded hashes in the backup job's cleanup process to ensure all hashes are persisted after execution. Removed the logic that checked for chunk existence in storage and the database before uploading, so chunks are now always uploaded without prior existence verification. Errors during hash flush are logged but do not interrupt cleanup.

Author: bvdcode

src/Octockup.Server/Jobs/BackupRunner.cs

@@ -108,6 +108,15 @@ public async Task RunAsync(Schedule schedule, CancellationToken cancellationToke
             }
             finally
             {
+                try
+                {
+                    await FlushUploadedHashesAsync(CancellationToken.None);
+                }
+                catch (Exception flushEx)
+                {
+                    logger.LogError(flushEx, "Failed to flush pending uploaded hashes after backup execution");
+                }
+
                 await report.DisposeAsync();
             }
         }
@@ -355,18 +364,7 @@ private async Task<int> ProcessFileAsync(
 
                     long storedSize = 0;
                     string path = ScheduleHelpers.SplitPlainHash(hash, storage.PathSeparator);
-                    bool exists = await storage.ExistsAsync(path, cancellationToken) ?? false;
                     CompressionAlgorithm algorithm;
-                    if (exists)
-                    {
-                        bool recordedInDb = await dbContext.UploadedHashes
-                            .AsNoTracking()
-                            .AnyAsync(x => x.Hash == hash && x.ModuleId == schedule.Backup.StorageId, cancellationToken);
-                        if (!recordedInDb)
-                        {
-                            throw new InvalidOperationException($"Chunk {shortHash} for file {file.Name} already exists in storage according to ExistsAsync check, but was not found in DB. Hash: {hash}, Path: {path}");
-                        }
-                    }
                     string size = $"{(chunkLength / (1024.0 * 1024.0)):F2} MB";
                     logger.LogInformation("Uploading chunk {shortHash} for file {FileName}, size: {size}", shortHash, file.Name, size);