How to get MySql return after running save model in Laravel

So, I got a Model in Laravel 5.4 associated with a table and in my Model Controller, when I try to insert a register using $post->save(); the model registry is not being inserted at the database. I revised the code many times and even comparing it with other equal codes that works (although this other code is in L 5.3) and everythings seems to be Ok so I guess it is something happening at the database level that is making this registry not to be inserted. So, how can I get a possible, if it's the case, error message comming from MySql in this situation? Because, after I run the save() method, nothing happens and I got no response. Thanks in advance

As suggested in the comments, I will post the complete code, however I still gottin no response from the Mysql level, the DB::enableQueryLog(); is still not writing to storage/logs/laravel.log:

The model:

class Post extends Model
{
    protected $table = 'posts';
}

The Controller:

public function store(Request $request)
{
    \DB::enableQueryLog();
    $this->validate($request, array(
        'assunto' => 'max:255',
        'conteudo' => 'required|max:65535',
        'arquivos[]' => 'required'

    ));

    $post = new Post;

    $post->assunto = Purifier::clean($request->assunto);
    $post->board = Purifier::clean($request->nomeboard);
    $post->conteudo = Purifier::clean($request->conteudo);
    $post->sage =  (Purifier::clean($request->sage) === "sage" ? 's' : 'n');
    $post->lead = (Purifier::clean($request->insidepost) === "n" ? 'n' : 's');
    $post->ipposter = $request()->ip();

    //$post->datacriacao = Carbon::now();
    //$post->ipposter = Request::ip();

    if($post->save()){
        $logfile = $this->iniciaLog('sucesso');
        $this->escreveLog("info", "registro inserido", $logfile);
    } else {
        $logfile = $this->iniciaLog('falha');
        $this->escreveLog("info", "erro ao inserir registro", $logfile);
    }
    $this->terminaLog($logfile);

    return redirect()->route('/{nomeBoard}', $request->nomeboard);
}

The migration which defines the table:

Schema::create('posts', function (Blueprint $table) {
        $table->increments('id');
        $table->string('assunto', 256); 
        $table->string('board', 10); 
        $table->text('conteudo');
        $table->char('sage', 1);
        $table->char('lead', 1);
        $table->string('ipposter', 15);
        $table->timestamps();
    }); 

via Fabiotk