posts, counter: Fixed post positions issues when a post is deleted.

models/posts/remove.go

@@ -1,6 +1,7 @@
 package posts
 
 import (
+	"git.aiterp.net/rpdata/api/internal/counter"
 	"git.aiterp.net/rpdata/api/models"
 	"github.com/globalsign/mgo/bson"
 )
@@ -20,6 +21,8 @@ func Remove(post models.Post) (models.Post, error) {
 		return models.Post{}, err
 	}
 
+	counter.NextMany("next_post_id", post.LogID, -1)
+
 	return post, nil
 }