Add post, fix delete forum, fix null pointer exceptions, min max limist

on database strings

DAL/Helpers/DbInitializer.cs

@@ -21,6 +21,7 @@ namespace DAL.Helpers
 
             };
             ctx.Foorums.Add(foorum);
+            ctx.SaveChanges();
 
 
             for (int i = 0; i < 3; i++)
@@ -30,7 +31,8 @@ namespace DAL.Helpers
                     Title = $"Post {i}",
                     Author = "Karu",
                     Body =  $"Pikk sisu {i}",
-                    CreationTime = DateTime.Now
+                    CreationTime = DateTime.Now,
+                    ForumId = foorum.FoorumId
                 };
                 ctx.Posts.Add(post);
                 foorum.Posts.Add(post);