Koreader Progress Sync (#3823)

Co-authored-by: Joseph Milazzo <josephmajora@gmail.com>

API/Data/Repositories/MangaFileRepository.cs

@@ -5,11 +5,13 @@ using API.Entities;
 using Microsoft.EntityFrameworkCore;
 
 namespace API.Data.Repositories;
+#nullable enable
 
 public interface IMangaFileRepository
 {
     void Update(MangaFile file);
     Task<IList<MangaFile>> GetAllWithMissingExtension();
+    Task<MangaFile?> GetByKoreaderHash(string hash);
 }
 
 public class MangaFileRepository : IMangaFileRepository
@@ -32,4 +34,13 @@ public class MangaFileRepository : IMangaFileRepository
             .Where(f => string.IsNullOrEmpty(f.Extension))
             .ToListAsync();
     }
+
+    public async Task<MangaFile?> GetByKoreaderHash(string hash)
+    {
+        if (string.IsNullOrEmpty(hash)) return null;
+
+        return await _context.MangaFile
+            .FirstOrDefaultAsync(f => f.KoreaderHash != null &&
+                                    f.KoreaderHash.Equals(hash.ToUpper()));
+    }
 }