Search hashtags via word index (#655)

Web/Models/Repositories/Posts.php

@@ -71,7 +71,7 @@ class Posts
     {
         $hashtag = "#$hashtag";
         $sel = $this->posts
-                    ->where("content LIKE ?", "%$hashtag%")
+                    ->where("MATCH (content) AGAINST (? IN BOOLEAN MODE)", "+$hashtag")
                     ->where("deleted", 0)
                     ->order("created DESC")
                     ->page($page, $perPage ?? OPENVK_DEFAULT_PER_PAGE);

install/sqls/00029-hashtag-search.sql

@@ -0,0 +1 @@
+ALTER TABLE `posts` ADD FULLTEXT `content` (`content`);