fix: Disable shared cache on SQLITE, reduces SQLITE locking errors.

Per documentation by Sqlite and MS, using `Cache=Shared` is discouraged, especially in combination with WAL. WAL mode is supposed to be the better solution overall, and enabling shared cache changes table locking behaviour increasing errors seen from concurrent actions.

server/RdtClient.Data/DiConfig.cs

@@ -14,7 +14,7 @@ public static class DiConfig
             throw new("Invalid database path found in appSettings");
         }
 
-        var connectionString = $"Data Source={appSettings.Database.Path};Cache=Shared;Pooling=True;Command Timeout=30";
+        var connectionString = $"Data Source={appSettings.Database.Path};Cache=Private;Pooling=True;Command Timeout=30";
         services.AddDbContext<DataContext>(options => options.UseSqlite(connectionString));
 
         services.AddScoped<DownloadData>();