diff --git a/Controllers/TdaApiController.cs b/Controllers/TdaApiController.cs
index 92b4a44..ef5408b 100644
--- a/Controllers/TdaApiController.cs
+++ b/Controllers/TdaApiController.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using TeacherDigitalAgency.DAL;
+using TeacherDigitalAgency.Data;
 using TeacherDigitalAgency.Models;
 
 namespace TeacherDigitalAgency.Controllers;
@@ -91,17 +92,20 @@ public ActionResult<string> AddLecturerByUuid([FromBody] Lecturer lecturerNew, [
 
         try
         {
-            _mongoDal.SetLecturer(lecturerNew, new Guid(uuid));
-            return Ok("Lecturer nastaven, pokud existoval");
+            var result = _mongoDal.SetLecturer(lecturerNew, new Guid(uuid));
+            return result switch
+            {
+                DbResult.Success => Ok("Lecturer nastaven"),
+                DbResult.NotFound => NotFound("UUID nenalezeno"),
+                _ => Problem(statusCode: 500)
+            };
         }
         catch(Exception ex)
         {
             _logger.LogError("Message: {message}, StackTrace: {stackTrace}", ex.Message, ex.StackTrace);
-            
-            //TODO: Odlišovat error u nás od nenalezena (Problem x NotFound)
-            //return Problem(statusCode: 500);
-            return NotFound("UUID nenalezeno");
+            return Problem(statusCode: 500);
         }
+
     }
 
     [HttpDelete("/lecturers/{uuid}")]
@@ -111,11 +115,13 @@ public ActionResult<string> DeleteLecturerByUuid([FromRoute] string uuid)
 
         try
         {
-            var success = _mongoDal.DeleteLecturer(new Guid(uuid));
-            if (!success)
-                return NotFound("Lecturer nenalezen - UUID");
-            
-            return NoContent();
+            var result = _mongoDal.DeleteLecturer(new Guid(uuid));
+            return result switch
+            {
+                DbResult.Success => NoContent(),
+                DbResult.NotFound => NotFound("UUID nenalezeno"),
+                _ => Problem(statusCode: 500)
+            };
         }
         catch (Exception ex)
         {
@@ -123,4 +129,4 @@ public ActionResult<string> DeleteLecturerByUuid([FromRoute] string uuid)
             return Problem(statusCode: 500);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/DAL/IMongoDal.cs b/DAL/IMongoDal.cs
index c5bff8d..cd38399 100644
--- a/DAL/IMongoDal.cs
+++ b/DAL/IMongoDal.cs
@@ -1,4 +1,5 @@
-using TeacherDigitalAgency.Models;
+using TeacherDigitalAgency.Data;
+using TeacherDigitalAgency.Models;
 
 namespace TeacherDigitalAgency.DAL;
 
@@ -6,7 +7,7 @@ public interface IMongoDal
 {
     public Lecturer? GetLecturer(Guid id);
     public IEnumerable<Lecturer> GetAllLecturers();
-    public void SetLecturer(Lecturer lecturer, Guid uuid);
-    public bool DeleteLecturer(Guid id);
-    public void AddLecturer(Lecturer lecturer);
+    public DbResult SetLecturer(Lecturer lecturer, Guid uuid);
+    public DbResult DeleteLecturer(Guid id);
+    public DbResult AddLecturer(Lecturer lecturer);
 }
\ No newline at end of file
diff --git a/DAL/MongoDal.cs b/DAL/MongoDal.cs
index d6c04fc..b21da73 100644
--- a/DAL/MongoDal.cs
+++ b/DAL/MongoDal.cs
@@ -1,4 +1,5 @@
 using MongoDB.Driver;
+using TeacherDigitalAgency.Data;
 using TeacherDigitalAgency.Models;
 
 namespace TeacherDigitalAgency.DAL;
@@ -6,17 +7,20 @@ namespace TeacherDigitalAgency.DAL;
 public class MongoDal: IMongoDal
 {
     private readonly IMongoCollection<Lecturer> _lecturersCollection;
+    private readonly ILogger<MongoDal> _logger;
 
-    public MongoDal(IConfiguration configuration)
+    public MongoDal(IConfiguration configuration, ILogger<MongoDal> logger)
     {
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        
         if (configuration == null)
             throw new ArgumentNullException(nameof(configuration));
-        
+
         var connectionString = configuration.GetConnectionString("MongoDb") ?? throw new ArgumentNullException(nameof(configuration));
-        
+
         var settings = MongoClientSettings.FromConnectionString(connectionString);
         settings.ServerApi = new ServerApi(ServerApiVersion.V1);
-        
+
         var client = new MongoClient(settings);
         _lecturersCollection = client.GetDatabase("tda-db").GetCollection<Lecturer>("lecturers");
     }
@@ -31,35 +35,67 @@ public IEnumerable<Lecturer> GetAllLecturers()
         return _lecturersCollection.Find(_ => true).ToEnumerable();
     }
 
-    public void SetLecturer(Lecturer lecturer, Guid uuid)
+    public DbResult SetLecturer(Lecturer lecturer, Guid uuid)
     {
-        var filter = Builders<Lecturer>.Filter.Eq(l => l.Uuid, uuid);
-        var update = Builders<Lecturer>.Update
-            .Set(l => l.TitleBefore, lecturer.TitleBefore)
-            .Set(l => l.FirstName, lecturer.FirstName)
-            .Set(l => l.MiddleName, lecturer.MiddleName)
-            .Set(l => l.LastName, lecturer.LastName)
-            .Set(l => l.TitleAfter, lecturer.TitleAfter)
-            .Set(l => l.PictureUrl, lecturer.PictureUrl)
-            .Set(l => l.Location, lecturer.Location)
-            .Set(l => l.Claim, lecturer.Claim)
-            .Set(l => l.Bio, lecturer.Bio)
-            .Set(l => l.Tags, lecturer.Tags)
-            .Set(l => l.PricePerHour, lecturer.PricePerHour)
-            .Set(l => l.ContactInfo, lecturer.ContactInfo);
+        try
+        {
+            var filter = Builders<Lecturer>.Filter.Eq(l => l.Uuid, uuid);
+            var update = Builders<Lecturer>.Update
+                .Set(l => l.TitleBefore, lecturer.TitleBefore)
+                .Set(l => l.FirstName, lecturer.FirstName)
+                .Set(l => l.MiddleName, lecturer.MiddleName)
+                .Set(l => l.LastName, lecturer.LastName)
+                .Set(l => l.TitleAfter, lecturer.TitleAfter)
+                .Set(l => l.PictureUrl, lecturer.PictureUrl)
+                .Set(l => l.Location, lecturer.Location)
+                .Set(l => l.Claim, lecturer.Claim)
+                .Set(l => l.Bio, lecturer.Bio)
+                .Set(l => l.Tags, lecturer.Tags)
+                .Set(l => l.PricePerHour, lecturer.PricePerHour)
+                .Set(l => l.ContactInfo, lecturer.ContactInfo);
 
-        _lecturersCollection.UpdateOne(filter, update);
+            var result = _lecturersCollection.UpdateOne(filter, update);
+      
+            if (result.MatchedCount <= 0)
+                return DbResult.NotFound;
+            
+            return DbResult.Success; 
+        }
+        catch(Exception ex)
+        {
+            _logger.LogError("SetLecturer Error - Message: {message}, StackTrace: {stackTrace}", ex.Message, ex.StackTrace);
+            return DbResult.Error; 
+        }
     }
 
-    public bool DeleteLecturer(Guid id)
+    public DbResult DeleteLecturer(Guid id)
     {
-        // TODO: Refactor return value - distinguish NotFound, Error and Success
-        var deleteResult = _lecturersCollection.DeleteOne(lecturer => lecturer.Uuid == id);
-        return deleteResult.DeletedCount > 0 && deleteResult.IsAcknowledged;
+        try
+        {
+            var result = _lecturersCollection.DeleteOne(lecturer => lecturer.Uuid == id);
+            if (result.DeletedCount <= 0)
+                return DbResult.NotFound;
+                
+            return DbResult.Success; 
+        }
+        catch(Exception ex)
+        {
+            _logger.LogError("DeleteLecturer Error - Message: {message}, StackTrace: {stackTrace}", ex.Message, ex.StackTrace);
+            return DbResult.Error; 
+        }
     }
 
-    public void AddLecturer(Lecturer lecturer)
+    public DbResult AddLecturer(Lecturer lecturer)
     {
-        _lecturersCollection.InsertOne(lecturer);
+        try
+        {
+            _lecturersCollection.InsertOne(lecturer);
+            return DbResult.Success;
+        }
+        catch(Exception ex)
+        { 
+            _logger.LogError("AddLecturer Error - Message: {message}, StackTrace: {stackTrace}", ex.Message, ex.StackTrace);
+            return DbResult.Error; 
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/Data/DbResult.cs b/Data/DbResult.cs
new file mode 100644
index 0000000..b715cc3
--- /dev/null
+++ b/Data/DbResult.cs
@@ -0,0 +1,8 @@
+namespace TeacherDigitalAgency.Data;
+
+public enum DbResult 
+{
+    Success,
+    NotFound,
+    Error
+}