diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 0408ea78a..6a5769399 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -3321,7 +3321,7 @@ class Contact
 				continue;
 			}
 			$contact = self::getByURL($url, false, ['id', 'updated']);
-			if (empty($contact['id'])) {
+			if (empty($contact['id']) && Network::isValidHttpUrl($url)) {
 				Worker::add(PRIORITY_LOW, 'AddContact', 0, $url);
 				++$added;
 			} elseif ($contact['updated'] < DateTimeFormat::utc('now -7 days')) {
diff --git a/src/Model/ItemURI.php b/src/Model/ItemURI.php
index 75d9cdc70..a19662735 100644
--- a/src/Model/ItemURI.php
+++ b/src/Model/ItemURI.php
@@ -21,8 +21,10 @@
 
 namespace Friendica\Model;
 
+use Friendica\Core\Logger;
 use Friendica\Database\Database;
 use Friendica\Database\DBA;
+use Friendica\DI;
 
 class ItemURI
 {
@@ -35,14 +37,16 @@ class ItemURI
 	 */
 	public static function insert(array $fields)
 	{
+		$fields = DI::dbaDefinition()->truncateFieldsForTable('item-uri', $fields);
+
 		if (!DBA::exists('item-uri', ['uri' => $fields['uri']])) {
-			DBA::insert('item-uri', $fields, Database::INSERT_UPDATE);
+			DBA::insert('item-uri', $fields, Database::INSERT_IGNORE);
 		}
 
 		$itemuri = DBA::selectFirst('item-uri', ['id', 'guid'], ['uri' => $fields['uri']]);
-
 		if (!DBA::isResult($itemuri)) {
 			// This shouldn't happen
+			Logger::warning('Item-uri not found', $fields);
 			return null;
 		}
 
@@ -77,22 +81,4 @@ class ItemURI
 
 		return $itemuri['id'] ?? 0;
 	}
-
-	/**
-	 * Searched for an id of a given guid.
-	 *
-	 * @param string $guid
-	 * @return integer item-uri id
-	 * @throws \Exception
-	 */
-	public static function getIdByGUID(string $guid): int
-	{
-		$itemuri = DBA::selectFirst('item-uri', ['id'], ['guid' => $guid]);
-
-		if (!DBA::isResult($itemuri)) {
-			return 0;
-		}
-
-		return $itemuri['id'];
-	}
 }
diff --git a/src/Module/ActivityPub/Objects.php b/src/Module/ActivityPub/Objects.php
index d52c02bef..96b3f638e 100644
--- a/src/Module/ActivityPub/Objects.php
+++ b/src/Module/ActivityPub/Objects.php
@@ -98,7 +98,7 @@ class Objects extends BaseModule
 		Network::checkEtagModified($etag, $last_modified);
 
 		if (empty($this->parameters['activity']) && ($item['gravity'] != GRAVITY_ACTIVITY)) {
-			$activity = ActivityPub\Transmitter::createActivityFromItem($item['id'], true);
+			$activity = ActivityPub\Transmitter::createCachedActivityFromItem($item['id'], false, true);
 			if (empty($activity['type'])) {
 				throw new HTTPException\NotFoundException();
 			}
@@ -115,7 +115,7 @@ class Objects extends BaseModule
 		} elseif (empty($this->parameters['activity']) || in_array($this->parameters['activity'],
 			['Create', 'Announce', 'Update', 'Like', 'Dislike', 'Accept', 'Reject',
 			'TentativeAccept', 'Follow', 'Add'])) {
-			$data = ActivityPub\Transmitter::createActivityFromItem($item['id']);
+			$data = ActivityPub\Transmitter::createCachedActivityFromItem($item['id']);
 			if (empty($data)) {
 				throw new HTTPException\NotFoundException();
 			}
diff --git a/src/Module/Settings/Account.php b/src/Module/Settings/Account.php
index dcbb1861f..373f1614d 100644
--- a/src/Module/Settings/Account.php
+++ b/src/Module/Settings/Account.php
@@ -38,6 +38,7 @@ use Friendica\Model\Verb;
 use Friendica\Module\BaseSettings;
 use Friendica\Network\HTTPException;
 use Friendica\Protocol\Activity;
+use Friendica\Util\Network;
 use Friendica\Util\Temporal;
 use Friendica\Worker\Delivery;
 
@@ -373,7 +374,7 @@ class Account extends BaseSettings
 						// or the handle of the account, therefore we check for either
 						// "http" or "@" to be present in the string.
 						// All other fields from the row will be ignored
-						if ((strpos($csvRow[0], '@') !== false) || in_array(parse_url($csvRow[0], PHP_URL_SCHEME), ['http', 'https'])) {
+						if ((strpos($csvRow[0], '@') !== false) || Network::isValidHttpUrl($csvRow[0])) {
 							Worker::add(PRIORITY_MEDIUM, 'AddContact', local_user(), $csvRow[0]);
 						} else {
 							Logger::notice('Invalid account', ['url' => $csvRow[0]]);
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 18d0cc65f..162745c39 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -1185,9 +1185,9 @@ class Transmitter
 	 * @return array|false activity or false on failure
 	 * @throws \Exception
 	 */
-	public static function createCachedActivityFromItem(int $item_id, bool $force = false)
+	public static function createCachedActivityFromItem(int $item_id, bool $force = false, bool $object_mode = false)
 	{
-		$cachekey = 'APDelivery:createActivity:' . $item_id;
+		$cachekey = 'APDelivery:createActivity:' . $item_id . ':' . (int)$object_mode;
 
 		if (!$force) {
 			$data = DI::cache()->get($cachekey);
@@ -1196,7 +1196,7 @@ class Transmitter
 			}
 		}
 
-		$data = self::createActivityFromItem($item_id);
+		$data = self::createActivityFromItem($item_id, $object_mode);
 
 		DI::cache()->set($cachekey, $data, Duration::QUARTER_HOUR);
 		return $data;
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index bd5cdd93e..9f1ab1585 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -795,7 +795,7 @@ return [
 			"conversation" => ["type" => "varbinary(383)", "comment" => ""],
 			"type" => ["type" => "varchar(64)", "comment" => "Type of the activity"],
 			"object-type" => ["type" => "varchar(64)", "comment" => "Type of the object activity"],
-			"object-object-type" => ["type" => "varchar(64)", "comment" => "Type of the object's object activity"],			
+			"object-object-type" => ["type" => "varchar(64)", "comment" => "Type of the object's object activity"],
 			"received" => ["type" => "datetime", "comment" => "Receiving date"],
 			"activity" => ["type" => "mediumtext", "comment" => "The JSON activity"],
 			"signer" => ["type" => "varchar(255)", "comment" => ""],
diff --git a/static/defaults.config.php b/static/defaults.config.php
index 926cdd7d3..7625de0bd 100644
--- a/static/defaults.config.php
+++ b/static/defaults.config.php
@@ -643,7 +643,7 @@ return [
 		'worker_load_exponent' => 3,
 
 		// worker_processes_cooldown (Integer)
-		// Maximum number pro processes that causes a cooldown before each worker function call.
+		// Maximum number per processes that causes a cooldown before each worker function call.
 		'worker_processes_cooldown' => 0,
 
 		// worker_multiple_fetch (Boolean)