fix: re-use file-name-hash entries

- Re-use the file-name-hash entry for the same name and file-size even if the hash differs, because of the unique constraint placed upon the database table which disallows multiple entries with the same name and file size to exist in the table.

Shoko.Server/Services/VideoLocal_PlaceService.cs

@@ -360,18 +360,15 @@ public async Task<RelocationResult> DirectlyRelocateFile(SVR_VideoLocal_Place pl
 
         if (renamed)
         {
-            // Add a new lookup entry.
-            var filenameHash = RepoFactory.FileNameHash.GetByHash(place.VideoLocal.Hash);
-            if (!filenameHash.Any(a => a.FileName.Equals(newFileName)))
+            // Add a new or update an existing lookup entry.
+            var video = place.VideoLocal;
+            var existingEntries = RepoFactory.FileNameHash.GetByHash(video.Hash);
+            if (!existingEntries.Any(a => a.FileName.Equals(newFileName)))
             {
-                var file = place.VideoLocal;
-                var hash = new FileNameHash
-                {
-                    DateTimeUpdated = DateTime.Now,
-                    FileName = newFileName,
-                    FileSize = file.FileSize,
-                    Hash = file.Hash,
-                };
+                var hash = RepoFactory.FileNameHash.GetByFileNameAndSize(newFileName, video.FileSize).FirstOrDefault() ??
+                    new() { FileName = newFileName, FileSize = video.FileSize };
+                hash.DateTimeUpdated = DateTime.Now;
+                hash.Hash = video.Hash;
                 RepoFactory.FileNameHash.Save(hash);
             }
         }