How to Restart or Delete all WordPress post ID for renumbering?

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I imported several thousand posts into a base install WordPress website using the great WP All Import Pro plugin.

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I used the following code snippet to determine what the last post ID was so that I could start the imported posts at the next following number in the sequence.

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/******************************************
* get latest post
* use in loop if ( is_latest() ) { stuff; }
******************************************/
function latest_post_ID() {
global $post;
$loop = get_posts( ‘numberposts=1’ );
$latest = $loop[0]->ID;
return ( $post->ID == $latest ) ? $post->ID : null;
}

function latest_post_ID2() {
$args = array(
‘post_type’ => ‘any’
);

$the_ID = get_posts($args);
$latest_ID = $the_ID[0]->ID;
echo $latest_ID;
}

function ehw_action_echo_latestPostID( ) {
echo “<H3>HEY! The latest post ID is: ” . latest_post_ID2() . “<H3>”;
}
add_action( ‘wp_footer’, ‘ehw_action_echo_latestPostID’ );

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The snippet returned **somewhere north of 3000 as the last post URL**. I thought that was odd since I hadn’t created any posts yet. So, logically the post number should have been “1”, one would think.

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I hadn’t created any posts for that custom post type, nor had I created an plain vanilla posts. But, I imported all 1300+ posts from the old site fine, which was the most important goal at the time.

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**MY QUESTIONS:**

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1) Is that normal to have over 3000 posts already created in WordPress on a brand new site with nothing on it?

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2) How can I restart the numbering scheme for the CUSTOM post type IDS? The old URLS are something like

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watch.php?ID=1
watch.php?ID=2
…
watch.php?ID=1300

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But, the new URLs are “pretty permalinks” with the “post name” style for best SEO practice

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3) If renumbering the post IDs isn’t possible/advisable, what would be a good approach that would allow for mapping the old post ID to the new post ID while still maintaining good SEO? I was considering something like adding the old ID into a custom permalink like

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https://[oldsite.com]/[old-id]/[post-name-slug]

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Thanks in advance

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