public async Task SavePostsAsync(IEnumerable<Post> posts)
 {
     using(var ctx = new RedditDBDataContext())
     {
         ctx.Posts.AddRange(posts);
         await ctx.SaveChangesAsync();
     }
 }
 public IEnumerable<Post> GetPosts(string callId)
 {
     using(var ctx = new RedditDBDataContext())
     {
         return ctx.Posts.Where(x => x.CallId == callId)
                         .Take(100)
                         .ToList();
     }
 }