Inserting tags outside of the loop problem (Difficult)

Hi there guys I’m trying to set post tags outside of the loop and the approach works partially: tags are created and linked to the post correctly, that is they appear when editing the post in BUT when listing tags within the dashboard, the counters are set to 0 as if unused by any post.

Basically I’m using MySQL code to access data with

// Gain acces to the DB
$link = mysqli_connect("localhost", "root", "") or
    die("Could not connect: " . mysqli_error());
mysqli_select_db($link, "mydbname");

// read data
$querystr = "SELECT * FROM tj_posts";
$result = mysqli_query($link, $querystr);
$row = mysqli_fetch_array($result, MYSQL_ASSOC))

$curID = $row["ID"];
$newtitle = "Hello";
$newcontent = "Some content here";

// Modifiy post using SQL
$query="UPDATE tj_posts SET post_title='$newtitle', post_content='$newcontent' WHERE ID='$curID'";
mysqli_query($link, $query) or
    die("Update error: " . mysqli_error());
// Update works correctly till here

// now the tags - Point to the post using WP API
$post = get_post($Id, ARRAY_A);
// set some tags
wp_set_post_tags($ID, "red, alcholic, bottled");

mysqli_free_result($result);
echo "Done!";