[FA-9] Need to add persistence layer

FictionArchive.Service.Shared/Services/GraphQL/LoggingErrorFilter.cs

@@ -0,0 +1,23 @@
+using Microsoft.Extensions.Logging;
+
+namespace FictionArchive.Service.Shared.Services.GraphQL;
+
+public class LoggingErrorFilter : IErrorFilter
+{
+    private readonly ILogger<LoggingErrorFilter> _logger;
+
+    public LoggingErrorFilter(ILogger<LoggingErrorFilter> logger)
+    {
+        _logger = logger;
+    }
+
+    public IError OnError(IError error)
+    {
+        if (error.Exception != null)
+        {
+            _logger.LogError(error.Exception, "Unexpected GraphQL error occurred");
+        }
+
+        return error;
+    }
+}