diff --git a/database.sql b/database.sql
index 010b64542..48de2fcae 100644
--- a/database.sql
+++ b/database.sql
@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2022.09-rc (Giant Rhubarb)
--- DB_UPDATE_VERSION 1483
+-- DB_UPDATE_VERSION 1484
 -- ------------------------------------------
 
 
@@ -309,6 +309,20 @@ CREATE TABLE IF NOT EXISTS `2fa_trusted_browser` (
 	FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON UPDATE RESTRICT ON DELETE CASCADE
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Two-factor authentication trusted browsers';
 
+--
+-- TABLE account-user
+--
+CREATE TABLE IF NOT EXISTS `account-user` (
+	`id` int unsigned NOT NULL auto_increment COMMENT 'sequential ID',
+	`uri-id` int unsigned NOT NULL COMMENT 'Id of the item-uri table entry that contains the account url',
+	`uid` mediumint unsigned NOT NULL COMMENT 'User ID',
+	 PRIMARY KEY(`id`),
+	 UNIQUE INDEX `uri-id_uid` (`uri-id`,`uid`),
+	 INDEX `uid_uri-id` (`uid`,`uri-id`),
+	FOREIGN KEY (`uri-id`) REFERENCES `item-uri` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE,
+	FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON UPDATE RESTRICT ON DELETE CASCADE
+) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Remote and local accounts';
+
 --
 -- TABLE addon
 --
diff --git a/doc/database.md b/doc/database.md
index 5aed24e91..1ffbf91f5 100644
--- a/doc/database.md
+++ b/doc/database.md
@@ -8,6 +8,7 @@ Database Tables
 | [2fa_app_specific_password](help/database/db_2fa_app_specific_password) | Two-factor app-specific _password |
 | [2fa_recovery_codes](help/database/db_2fa_recovery_codes) | Two-factor authentication recovery codes |
 | [2fa_trusted_browser](help/database/db_2fa_trusted_browser) | Two-factor authentication trusted browsers |
+| [account-user](help/database/db_account-user) | Remote and local accounts |
 | [addon](help/database/db_addon) | registered addons |
 | [apcontact](help/database/db_apcontact) | ActivityPub compatible contacts - used in the ActivityPub implementation |
 | [application](help/database/db_application) | OAuth application |
diff --git a/doc/database/db_account-user.md b/doc/database/db_account-user.md
new file mode 100644
index 000000000..1c3c40172
--- /dev/null
+++ b/doc/database/db_account-user.md
@@ -0,0 +1,32 @@
+Table account-user
+===========
+
+Remote and local accounts
+
+Fields
+------
+
+| Field  | Description                                                  | Type               | Null | Key | Default | Extra          |
+| ------ | ------------------------------------------------------------ | ------------------ | ---- | --- | ------- | -------------- |
+| id     | sequential ID                                                | int unsigned       | NO   | PRI | NULL    | auto_increment |
+| uri-id | Id of the item-uri table entry that contains the account url | int unsigned       | NO   |     | NULL    |                |
+| uid    | User ID                                                      | mediumint unsigned | NO   |     | NULL    |                |
+
+Indexes
+------------
+
+| Name       | Fields              |
+| ---------- | ------------------- |
+| PRIMARY    | id                  |
+| uri-id_uid | UNIQUE, uri-id, uid |
+| uid_uri-id | uid, uri-id         |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uri-id | [item-uri](help/database/db_item-uri) | id |
+| uid | [user](help/database/db_user) | uid |
+
+Return to [database documentation](help/database)
diff --git a/src/Console/MergeContacts.php b/src/Console/MergeContacts.php
index 405622cc4..e230499d2 100644
--- a/src/Console/MergeContacts.php
+++ b/src/Console/MergeContacts.php
@@ -23,6 +23,7 @@ namespace Friendica\Console;
 
 use Friendica\Core\L10n;
 use Friendica\Database\Database;
+use Friendica\Model\Contact;
 
 /**
  * tool to find and merge duplicated contact entries.
@@ -137,7 +138,7 @@ HELP;
 		$this->updateTable('post-thread-user', 'contact-id', $from, $to, false);
 		$this->updateTable('user-contact', 'cid', $from, $to, true);
 
-		if (!$this->dba->delete('contact', ['id' => $from])) {
+		if (!Contact::deleteById($from)) {
 			$this->err($this->l10n->t('Deletion of id %d failed', $from));
 		} else {
 			$this->out($this->l10n->t('Deletion of id %d was successful', $from));
diff --git a/src/Database/PostUpdate.php b/src/Database/PostUpdate.php
index 9216d800d..82fe70e3f 100644
--- a/src/Database/PostUpdate.php
+++ b/src/Database/PostUpdate.php
@@ -50,7 +50,7 @@ class PostUpdate
 	// Needed for the helper function to read from the legacy term table
 	const OBJECT_TYPE_POST  = 1;
 
-	const VERSION = 1452;
+	const VERSION = 1484;
 
 	/**
 	 * Calls the post update functions
@@ -114,6 +114,9 @@ class PostUpdate
 		if (!self::update1483()) {
 			return false;
 		}
+		if (!self::update1484()) {
+			return false;
+		}
 		return true;
 	}
 
@@ -1120,4 +1123,51 @@ class PostUpdate
 		Logger::info('Done');
 		return true;
 	}
+
+	/**
+	 * Handle duplicate contact entries
+	 *
+	 * @return bool "true" when the job is done
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @throws \ImagickException
+	 */
+	private static function update1484()
+	{
+		// Was the script completed?
+		if (DI::config()->get('system', 'post_update_version') >= 1484) {
+			return true;
+		}
+
+		$id = DI::config()->get('system', 'post_update_version_1484_id', 0);
+
+		Logger::info('Start', ['id' => $id]);
+
+		$rows = 0;
+
+		$contacts = DBA::select('contact', ['id', 'uid', 'uri-id', 'url'], ["`id` > ?", $id], ['order' => ['id'], 'limit' => 1000]);
+
+		if (DBA::errorNo() != 0) {
+			Logger::error('Database error', ['no' => DBA::errorNo(), 'message' => DBA::errorMessage()]);
+			return false;
+		}
+
+		while ($contact = DBA::fetch($contacts)) {
+			$id = $contact['id'];
+			Contact::setAccountUser($contact['id'], $contact['uid'], $contact['uri-id'], $contact['url']);
+			++$rows;
+		}
+		DBA::close($contacts);
+
+		DI::config()->set('system', 'post_update_version_1484_id', $id);
+
+		Logger::info('Processed', ['rows' => $rows, 'last' => $id]);
+
+		if ($rows <= 100) {
+			DI::config()->set('system', 'post_update_version', 1484);
+			Logger::info('Done');
+			return true;
+		}
+
+		return false;
+	}
 }
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 1f5dbcdca..9e363bf37 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -169,16 +169,41 @@ class Contact
 			return 0;
 		}
 
-		Contact\User::insertForContactArray($contact);
-
-		// Search for duplicated contacts and get rid of them
-		if (!$contact['self']) {
-			self::removeDuplicates($contact['nurl'], $contact['uid']);
+		$fields = DI::dbaDefinition()->truncateFieldsForTable('account-user', $contact);
+		DBA::insert('account-user', $fields, Database::INSERT_IGNORE);
+		$account_user = DBA::selectFirst('account-user', ['id'], ['uid' => $contact['uid'], 'uri-id' => $contact['uri-id']]);
+		if (empty($account_user['id'])) {
+			Logger::warning('Account-user entry not found', ['cid' => $contact['id'], 'uid' => $contact['uid'], 'uri-id' => $contact['uri-id'], 'url' => $contact['url']]);
+		} elseif ($account_user['id'] != $contact['id']) {
+			$duplicate = DBA::selectFirst('contact', [], ['id' => $account_user['id'], 'deleted' => false]);
+			if (!empty($duplicate['id'])) {
+				$ret = Contact::deleteById($contact['id']);
+				Logger::notice('Deleted duplicated contact', ['ret' => $ret, 'account-user' => $account_user, 'cid' => $duplicate['id'], 'uid' => $duplicate['uid'], 'uri-id' => $duplicate['uri-id'], 'url' => $duplicate['url']]);
+				$contact = $duplicate;
+			} else {
+				$ret = DBA::update('account-user', ['id' => $contact['id']], ['uid' => $contact['uid'], 'uri-id' => $contact['uri-id']]);
+				Logger::notice('Updated account-user', ['ret' => $ret, 'account-user' => $account_user, 'cid' => $contact['id'], 'uid' => $contact['uid'], 'uri-id' => $contact['uri-id'], 'url' => $contact['url']]);
+			}
 		}
 
+		Contact\User::insertForContactArray($contact);
+
 		return $contact['id'];
 	}
 
+	/**
+	 * Delete contact by id
+	 *
+	 * @param integer $id
+	 * @return boolean
+	 */
+	public static function deleteById(int $id): bool
+	{
+		Logger::debug('Delete contact', ['id' => $id]);
+		DBA::delete('account-user', ['id' => $id]);
+		return DBA::delete('contact', ['id' => $id]);
+	}
+
 	/**
 	 * Updates rows in the contact table
 	 *
@@ -824,6 +849,8 @@ class Contact
 			return;
 		}
 
+		DBA::delete('account-user', ['id' => $id]);
+
 		self::clearFollowerFollowingEndpointCache($contact['uid']);
 
 		// Archive the contact
@@ -1255,6 +1282,11 @@ class Contact
 			return 0;
 		}
 
+		if (!$contact_id && !empty($data['account-type']) && $data['account-type'] == User::ACCOUNT_TYPE_DELETED) {
+			Logger::info('Contact is a tombstone. It will not be inserted', ['url' => $url, 'uid' => $uid]);
+			return 0;
+		}
+
 		if (!$contact_id) {
 			$urls = [Strings::normaliseLink($url), Strings::normaliseLink($data['url'])];
 			if (!empty($data['alias'])) {
@@ -1284,20 +1316,15 @@ class Contact
 			$condition = ['nurl' => Strings::normaliseLink($data["url"]), 'uid' => $uid, 'deleted' => false];
 
 			// Before inserting we do check if the entry does exist now.
-			if (DI::lock()->acquire(self::LOCK_INSERT, 0)) {
-				$contact = DBA::selectFirst('contact', ['id'], $condition, ['order' => ['id']]);
-				if (DBA::isResult($contact)) {
-					$contact_id = $contact['id'];
-					Logger::notice('Contact had been created (shortly) before', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
-				} else {
-					$contact_id = self::insert($fields);
-					if ($contact_id) {
-						Logger::info('Contact inserted', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
-					}
-				}
-				DI::lock()->release(self::LOCK_INSERT);
+			$contact = DBA::selectFirst('contact', ['id'], $condition, ['order' => ['id']]);
+			if (DBA::isResult($contact)) {
+				$contact_id = $contact['id'];
+				Logger::notice('Contact had been created (shortly) before', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
 			} else {
-				Logger::warning('Contact lock had not been acquired');
+				$contact_id = self::insert($fields);
+				if ($contact_id) {
+					Logger::info('Contact inserted', ['id' => $contact_id, 'url' => $url, 'uid' => $uid]);
+				}
 			}
 
 			if (!$contact_id) {
@@ -2221,25 +2248,22 @@ class Contact
 	/**
 	 * Helper function for "updateFromProbe". Updates personal and public contact
 	 *
-	 * @param integer $id      contact id
-	 * @param integer $uid     user id
-	 * @param string  $old_url The previous profile URL of the contact
-	 * @param string  $new_url The profile URL of the contact
-	 * @param array   $fields  The fields that are updated
+	 * @param integer $id     contact id
+	 * @param integer $uid    user id
+	 * @param integer $uri_id Uri-Id
+	 * @param string  $url    The profile URL of the contact
+	 * @param array   $fields The fields that are updated
 	 *
 	 * @throws \Exception
 	 */
-	private static function updateContact(int $id, int $uid, string $old_url, string $new_url, array $fields)
+	private static function updateContact(int $id, int $uid, int $uri_id, string $url, array $fields)
 	{
 		if (!self::update($fields, ['id' => $id])) {
 			Logger::info('Couldn\'t update contact.', ['id' => $id, 'fields' => $fields]);
 			return;
 		}
 
-		// Search for duplicated contacts and get rid of them
-		if (self::removeDuplicates(Strings::normaliseLink($new_url), $uid)) {
-			return;
-		}
+		self::setAccountUser($id, $uid, $uri_id, $url);
 
 		// Archive or unarchive the contact.
 		$contact = DBA::selectFirst('contact', [], ['id' => $id]);
@@ -2261,7 +2285,7 @@ class Contact
 		}
 
 		// Update contact data for all users
-		$condition = ['self' => false, 'nurl' => Strings::normaliseLink($old_url)];
+		$condition = ['self' => false, 'nurl' => Strings::normaliseLink($url)];
 
 		$condition['network'] = [Protocol::DFRN, Protocol::DIASPORA, Protocol::ACTIVITYPUB];
 		self::update($fields, $condition);
@@ -2283,6 +2307,51 @@ class Contact
 		self::update($fields, $condition);
 	}
 
+	/**
+	 * Create or update an "account-user" entry
+	 *
+	 * @param integer $id
+	 * @param integer $uid
+	 * @param integer $uri_id
+	 * @param string $url
+	 * @return void
+	 */
+	public static function setAccountUser(int $id, int $uid, int $uri_id, string $url)
+	{
+		if (empty($uri_id)) {
+			return;
+		}
+
+		$account_user = DBA::selectFirst('account-user', ['id', 'uid', 'uri-id'], ['id' => $id]);
+		if (!empty($account_user['uri-id']) && ($account_user['uri-id'] != $uri_id)) {
+			if ($account_user['uid'] == $uid) {
+				$ret = DBA::update('account-user', ['uri-id' => $uri_id], ['id' => $id]);
+				Logger::notice('Updated account-user uri-id', ['ret' => $ret, 'account-user' => $account_user, 'cid' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+			} else {
+				// This should never happen
+				Logger::warning('account-user exists for a different uri-id and uid', ['account_user' => $account_user, 'id' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+			}
+		}
+
+		$account_user = DBA::selectFirst('account-user', ['id', 'uid', 'uri-id'], ['uid' => $uid, 'uri-id' => $uri_id]);
+		if (!empty($account_user['id'])) {
+			if ($account_user['id'] == $id) {
+				Logger::debug('account-user already exists', ['id' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+				return;
+			} elseif (!DBA::exists('contact', ['id' => $account_user['id'], 'deleted' => false])) {
+				$ret = DBA::update('account-user', ['id' => $id], ['uid' => $uid, 'uri-id' => $uri_id]);
+				Logger::notice('Updated account-user', ['ret' => $ret, 'account-user' => $account_user, 'cid' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+				return;
+			}
+			Logger::warning('account-user exists for a different contact id', ['account_user' => $account_user, 'id' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+			Worker::add(PRIORITY_HIGH, 'MergeContact', $account_user['id'], $id, $uid);
+		} elseif (DBA::insert('account-user', ['id' => $id, 'uri-id' => $uri_id, 'uid' => $uid], Database::INSERT_IGNORE)) {
+			Logger::notice('account-user was added', ['id' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+		} else {
+			Logger::warning('account-user was not added', ['id' => $id, 'uid' => $uid, 'uri-id' => $uri_id, 'url' => $url]);
+		}
+	}
+
 	/**
 	 * Remove duplicated contacts
 	 *
@@ -2307,11 +2376,6 @@ class Contact
 
 		$first = $first_contact['id'];
 		Logger::info('Found duplicates', ['count' => $count, 'first' => $first, 'uid' => $uid, 'nurl' => $nurl]);
-		if (($uid != 0 && ($first_contact['network'] == Protocol::DFRN))) {
-			// Don't handle non public DFRN duplicates by now (legacy DFRN is very special because of the key handling)
-			Logger::info('Not handling non public DFRN duplicate', ['uid' => $uid, 'nurl' => $nurl]);
-			return false;
-		}
 
 		// Find all duplicates
 		$condition = ["`nurl` = ? AND `uid` = ? AND `id` != ? AND NOT `self` AND NOT `deleted`", $nurl, $uid, $first];
@@ -2476,7 +2540,7 @@ class Contact
 
 		if (Strings::normaliseLink($contact['url']) != Strings::normaliseLink($ret['url'])) {
 			Logger::notice('New URL differs from old URL', ['id' => $id, 'uid' => $uid, 'old' => $contact['url'], 'new' => $ret['url']]);
-			self::updateContact($id, $uid, $contact['url'], $ret['url'], ['failed' => true, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $failed_next_update, 'failure_update' => $updated]);
+			self::updateContact($id, $uid, $uriid, $contact['url'], ['failed' => true, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $failed_next_update, 'failure_update' => $updated]);
 			return false;
 		}
 
@@ -2484,14 +2548,14 @@ class Contact
 		// We check after the probing to be able to correct falsely detected contact types.
 		if (($contact['contact-type'] == self::TYPE_RELAY) &&
 			(!Strings::compareLink($ret['url'], $contact['url']) || in_array($ret['network'], [Protocol::FEED, Protocol::PHANTOM]))) {
-			self::updateContact($id, $uid, $contact['url'], $contact['url'], ['failed' => false, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $success_next_update, 'success_update' => $updated]);
+			self::updateContact($id, $uid, $uriid, $contact['url'], ['failed' => false, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $success_next_update, 'success_update' => $updated]);
 			Logger::info('Not updating relais', ['id' => $id, 'url' => $contact['url']]);
 			return true;
 		}
 
 		// If Probe::uri fails the network code will be different ("feed" or "unkn")
 		if (($ret['network'] == Protocol::PHANTOM) || (($ret['network'] == Protocol::FEED) && ($ret['network'] != $contact['network']))) {
-			self::updateContact($id, $uid, $contact['url'], $ret['url'], ['failed' => true, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $failed_next_update, 'failure_update' => $updated]);
+			self::updateContact($id, $uid, $uriid, $contact['url'], ['failed' => true, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $failed_next_update, 'failure_update' => $updated]);
 			return false;
 		}
 
@@ -2560,10 +2624,8 @@ class Contact
 			self::updateAvatar($id, $ret['photo'], $update);
 		}
 
-		$uriid = ItemURI::insert(['uri' => $ret['url'], 'guid' => $guid]);
-
 		if (!$update) {
-			self::updateContact($id, $uid, $contact['url'], $ret['url'], ['failed' => false, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $success_next_update, 'success_update' => $updated]);
+			self::updateContact($id, $uid, $uriid, $contact['url'], ['failed' => false, 'local-data' => $has_local_data, 'last-update' => $updated, 'next-update' => $success_next_update, 'success_update' => $updated]);
 
 			if (Contact\Relation::isDiscoverable($ret['url'])) {
 				Worker::add(PRIORITY_LOW, 'ContactDiscovery', $ret['url']);
@@ -2580,7 +2642,7 @@ class Contact
 			return true;
 		}
 
-		$ret['uri-id']      = $uriid;
+		$ret['uri-id']      = ItemURI::insert(['uri' => $ret['url'], 'guid' => $guid]);
 		$ret['nurl']        = Strings::normaliseLink($ret['url']);
 		$ret['updated']     = $updated;
 		$ret['failed']      = false;
@@ -2607,7 +2669,7 @@ class Contact
 
 		unset($ret['photo']);
 
-		self::updateContact($id, $uid, $contact['url'], $ret['url'], $ret);
+		self::updateContact($id, $uid, $ret['uri-id'], $ret['url'], $ret);
 
 		if (Contact\Relation::isDiscoverable($ret['url'])) {
 			Worker::add(PRIORITY_LOW, 'ContactDiscovery', $ret['url']);
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 94702e1cc..de8666c98 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -2484,16 +2484,16 @@ class Item
 			return;
 		}
 
-		$expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
+		$expire_items = (bool)DI::pConfig()->get($uid, 'expire', 'items', true);
 
 		// Forcing expiring of items - but not notes and marked items
 		if ($force) {
 			$expire_items = true;
 		}
 
-		$expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
-		$expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
-		$expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
+		$expire_notes = (bool)DI::pConfig()->get($uid, 'expire', 'notes', true);
+		$expire_starred = (bool)DI::pConfig()->get($uid, 'expire', 'starred', true);
+		$expire_photos = (bool)DI::pConfig()->get($uid, 'expire', 'photos', false);
 
 		$expired = 0;
 
@@ -2522,7 +2522,7 @@ class Item
 			++$expired;
 		}
 		DBA::close($items);
-		Logger::notice('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
+		Logger::notice('Expired', ['user' => $uid, 'days' => $days, 'network' => $network, 'force' => $force, 'expired' => $expired, 'expire items' => $expire_items, 'expire notes' => $expire_notes, 'expire starred' => $expire_starred, 'expire photos' => $expire_photos, 'condition' => $condition]);
 	}
 
 	public static function firstPostDate(int $uid, bool $wall = false)
diff --git a/src/Module/Xrd.php b/src/Module/Xrd.php
index b12e94a29..098c1574e 100644
--- a/src/Module/Xrd.php
+++ b/src/Module/Xrd.php
@@ -83,7 +83,7 @@ class Xrd extends BaseModule
 		} else {
 			$owner = User::getOwnerDataByNick($name);
 			if (empty($owner)) {
-				DI::logger()->warning('No owner data for user id', ['uri' => $uri, 'name' => $name]);
+				DI::logger()->notice('No owner data for user id', ['uri' => $uri, 'name' => $name]);
 				throw new NotFoundException('Owner was not found for user->uid=' . $name);
 			}
 
diff --git a/src/Protocol/ActivityPub/Delivery.php b/src/Protocol/ActivityPub/Delivery.php
index 9aa45d041..f66febb82 100644
--- a/src/Protocol/ActivityPub/Delivery.php
+++ b/src/Protocol/ActivityPub/Delivery.php
@@ -84,7 +84,7 @@ class Delivery
 			if (empty($item['id'])) {
 				Logger::warning('Item not found, removing delivery', ['uri-id' => $uri_id, 'uid' => $uid, 'cmd' => $cmd, 'inbox' => $inbox]);
 				Post\Delivery::remove($uri_id, $inbox);
-				return true;
+				return ['success' => true, 'serverfailure' => false, 'drop' => false];
 			} else {
 				$item_id = $item['id'];
 			}
diff --git a/src/Worker/Contact/Remove.php b/src/Worker/Contact/Remove.php
index fbede2cda..a3d26aa69 100644
--- a/src/Worker/Contact/Remove.php
+++ b/src/Worker/Contact/Remove.php
@@ -23,6 +23,7 @@ namespace Friendica\Worker\Contact;
 
 use Friendica\Core\Logger;
 use Friendica\Database\DBA;
+use Friendica\Model\Contact;
 
 /**
  * Removes a contact and all its related content
@@ -41,7 +42,7 @@ class Remove extends RemoveContent
 			return false;
 		}
 
-		$ret = DBA::delete('contact', ['id' => $id]);
+		$ret = Contact::deleteById($id);
 		Logger::info('Deleted contact', ['id' => $id, 'result' => $ret]);
 
 		return true;
diff --git a/src/Worker/MergeContact.php b/src/Worker/MergeContact.php
index e1383f211..15fedd4b8 100644
--- a/src/Worker/MergeContact.php
+++ b/src/Worker/MergeContact.php
@@ -24,6 +24,7 @@ namespace Friendica\Worker;
 use Friendica\Core\Logger;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
+use Friendica\Model\Contact;
 
 class MergeContact
 {
@@ -68,10 +69,57 @@ class MergeContact
 				DBA::update('thread', ['owner-id' => $new_cid], ['owner-id' => $old_cid]);
 			}
 		} else {
-			/// @todo Check if some other data needs to be adjusted as well, possibly the "rel" status?
+			self::mergePersonalContacts($new_cid, $old_cid);
 		}
 
 		// Remove the duplicate
-		DBA::delete('contact', ['id' => $old_cid]);
+		Contact::deleteById($old_cid);
+	}
+
+	/**
+	 * Merge important fields between two contacts
+	 *
+	 * @param integer $first
+	 * @param integer $duplicate
+	 * @return void
+	 */
+	private static function mergePersonalContacts(int $first, int $duplicate)
+	{
+		$fields = ['self', 'remote_self', 'rel', 'prvkey', 'subhub', 'hub-verify', 'priority', 'writable', 'archive', 'pending',
+			'rating', 'notify_new_posts', 'fetch_further_information', 'ffi_keyword_denylist', 'block_reason'];
+		$c1 = Contact::getById($first, $fields);
+		$c2 = Contact::getById($duplicate, $fields);
+
+		$ctarget = $c1;
+
+		if ($c1['self'] || $c2['self']) {
+			return;
+		}
+
+		$ctarget['rel'] = $c1['rel'] | $c2['rel'];
+		foreach (['prvkey', 'hub-verify', 'priority', 'rating', 'fetch_further_information', 'ffi_keyword_denylist', 'block_reason'] as $field) {
+			$ctarget[$field] = $c1[$field] ?: $c2[$field];
+		}
+
+		foreach (['remote_self', 'subhub', 'writable', 'notify_new_posts'] as $field) {
+			$ctarget[$field] = $c1[$field] || $c2[$field];
+		}
+
+		foreach (['archive', 'pending'] as $field) {
+			$ctarget[$field] = $c1[$field] && $c2[$field];
+		}
+
+		$data = [];
+
+		foreach ($fields as $field) {
+			if ($ctarget[$field] != $c1[$field]) {
+				$data[$field] = $ctarget[$field];
+			}
+		}
+
+		if (empty($data)) {
+			return;
+		}
+		Contact::update($data, ['id' => $first]);
 	}
 }
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 7921097d4..76eb260a0 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -502,7 +502,7 @@ class Notifier
 		$a = DI::app();
 		$delivery_queue_count = 0;
 
-		if ($target_item['verb'] == Activity::ANNOUNCE) {
+		if (!empty($target_item['verb']) && ($target_item['verb'] == Activity::ANNOUNCE)) {
 			Logger::notice('Announces are only delivery via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'guid' => $target_item['guid'], 'uri-id' => $target_item['uri-id'], 'uri' => $target_item['uri']]);
 			return 0;
 		}
diff --git a/src/Worker/PushSubscription.php b/src/Worker/PushSubscription.php
index 9b22ff484..e6876ad3e 100644
--- a/src/Worker/PushSubscription.php
+++ b/src/Worker/PushSubscription.php
@@ -31,7 +31,6 @@ use Friendica\Model\Contact;
 use Friendica\Model\Post;
 use Friendica\Model\Subscription as ModelSubscription;
 use Friendica\Model\User;
-use Friendica\Navigation\Notifications;
 use Friendica\Network\HTTPException\NotFoundException;
 use Minishlink\WebPush\WebPush;
 use Minishlink\WebPush\Subscription;
@@ -91,7 +90,7 @@ class PushSubscription
 		}
 
 		$message = DI::notificationFactory()->getMessageFromNotification($notification);
-		$title = $message['plain'] ?: '';
+		$title = $message['plain'] ?? '';
 
 		$push = Subscription::create([
 			'contentEncoding' => 'aesgcm',
diff --git a/src/Worker/RemoveUnusedContacts.php b/src/Worker/RemoveUnusedContacts.php
index 6a4199634..038376c22 100644
--- a/src/Worker/RemoveUnusedContacts.php
+++ b/src/Worker/RemoveUnusedContacts.php
@@ -78,7 +78,7 @@ class RemoveUnusedContacts
 			DBA::delete('post-thread-user', ['author-id' => $contact['id']]);
 			DBA::delete('post-thread-user', ['causer-id' => $contact['id']]);
 
-			DBA::delete('contact', ['id' => $contact['id']]);
+			Contact::deleteById($contact['id']);
 			if ((++$count % 1000) == 0) {
 				Logger::info('In removal', ['count' => $count, 'total' => $total]);
 			}
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index 4bba542c2..90fea5bcf 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -55,7 +55,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1483);
+	define('DB_UPDATE_VERSION', 1484);
 }
 
 return [
@@ -371,6 +371,19 @@ return [
 			"uid" => ["uid"],
 		]
 	],
+	"account-user" => [
+		"comment" => "Remote and local accounts",
+		"fields" => [
+			"id" => ["type" => "int unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "sequential ID"],
+			"uri-id" => ["type" => "int unsigned", "not null" => "1", "foreign" => ["item-uri" => "id"], "comment" => "Id of the item-uri table entry that contains the account url"],
+			"uid" => ["type" => "mediumint unsigned", "not null" => "1", "foreign" => ["user" => "uid"], "comment" => "User ID"],
+		],
+		"indexes" => [
+			"PRIMARY" => ["id"],
+			"uri-id_uid" => ["UNIQUE", "uri-id", "uid"],
+			"uid_uri-id" => ["uid", "uri-id"],
+		]
+	],
 	"addon" => [
 		"comment" => "registered addons",
 		"fields" => [