diff --git a/config/config.ini.php b/config/config.ini.php
index ea3df52cb..a324e709e 100644
--- a/config/config.ini.php
+++ b/config/config.ini.php
@@ -121,9 +121,14 @@ db_loglimit_index_high = 0
 
 ; dbclean_expire_conversation (Integer)
 ; When DBClean is enabled, any entry in the conversation table will be deleted after this many days.
-; These data are normally needed only for debugging purposes and they are safe to delete.
+: This data is used for ActivityPub, so it shouldn't be lower than the average duration of a discussion.
 dbclean_expire_conversation = 90
 
+; dbclean-expire-limit (Integer)
+; This defines the number of items that are to be deleted in a single call.
+; Reduce this value when you are getting memory issues.
+dbclean-expire-limit = 1000
+
 ; diaspora_test (Boolean)
 ; For development only. Disables the message transfer.
 diaspora_test = false
diff --git a/include/enotify.php b/include/enotify.php
index 6d8cef879..5665f485f 100644
--- a/include/enotify.php
+++ b/include/enotify.php
@@ -134,6 +134,7 @@ function notification($params)
 		$thread = Item::selectFirstThreadForUser($params['uid'] ,['ignored'], ['iid' => $parent_id]);
 		if (DBA::isResult($thread) && $thread["ignored"]) {
 			logger("Thread ".$parent_id." will be ignored", LOGGER_DEBUG);
+			L10n::popLang();
 			return;
 		}
 
@@ -628,6 +629,7 @@ function notification($params)
 			'$content_allowed'	=> $content_allowed,
 		]);
 
+		L10n::popLang();
 		// use the Emailer class to send the message
 		return Emailer::send(
 			[
@@ -643,6 +645,7 @@ function notification($params)
 		);
 	}
 
+	L10n::popLang();
 	return false;
 }
 
diff --git a/index.php b/index.php
index 884b06732..c834688ff 100644
--- a/index.php
+++ b/index.php
@@ -260,6 +260,8 @@ if (strlen($a->module)) {
 		} else {
 			include_once "addon/{$a->module}/{$a->module}.php";
 			if (function_exists($a->module . '_module')) {
+				Friendica\LegacyModule::setModuleFile("addon/{$a->module}/{$a->module}.php");
+				$a->module_class = 'Friendica\\LegacyModule';
 				$a->module_loaded = true;
 			}
 		}
@@ -273,10 +275,11 @@ if (strlen($a->module)) {
 
 	/**
 	 * If not, next look for a 'standard' program module in the 'mod' directory
+	 * We emulate a Module class through the LegacyModule class
 	 */
-
 	if (! $a->module_loaded && file_exists("mod/{$a->module}.php")) {
-		include_once "mod/{$a->module}.php";
+		Friendica\LegacyModule::setModuleFile("mod/{$a->module}.php");
+		$a->module_class = 'Friendica\\LegacyModule';
 		$a->module_loaded = true;
 	}
 
@@ -336,16 +339,11 @@ if ($a->module_loaded) {
 
 	Addon::callHooks($a->module . '_mod_init', $placeholder);
 
-	if ($a->module_class) {
-		call_user_func([$a->module_class, 'init']);
-	} else if (function_exists($a->module . '_init')) {
-		$func = $a->module . '_init';
-		$func($a);
-	}
+	call_user_func([$a->module_class, 'init']);
 
 	// "rawContent" is especially meant for technical endpoints.
 	// This endpoint doesn't need any theme initialization or other comparable stuff.
-	if (!$a->error && $a->module_class) {
+	if (!$a->error) {
 		call_user_func([$a->module_class, 'rawContent']);
 	}
 
@@ -356,34 +354,19 @@ if ($a->module_loaded) {
 
 	if (! $a->error && $_SERVER['REQUEST_METHOD'] === 'POST') {
 		Addon::callHooks($a->module . '_mod_post', $_POST);
-		if ($a->module_class) {
-			call_user_func([$a->module_class, 'post']);
-		} else if (function_exists($a->module . '_post')) {
-			$func = $a->module . '_post';
-			$func($a);
-		}
+		call_user_func([$a->module_class, 'post']);
 	}
 
 	if (! $a->error) {
 		Addon::callHooks($a->module . '_mod_afterpost', $placeholder);
-		if ($a->module_class) {
-			call_user_func([$a->module_class, 'afterpost']);
-		} else if (function_exists($a->module . '_afterpost')) {
-			$func = $a->module . '_afterpost';
-			$func($a);
-		}
+		call_user_func([$a->module_class, 'afterpost']);
 	}
 
 	if (! $a->error) {
 		$arr = ['content' => $a->page['content']];
 		Addon::callHooks($a->module . '_mod_content', $arr);
 		$a->page['content'] = $arr['content'];
-		if ($a->module_class) {
-			$arr = ['content' => call_user_func([$a->module_class, 'content'])];
-		} else if (function_exists($a->module . '_content')) {
-			$func = $a->module . '_content';
-			$arr = ['content' => $func($a)];
-		}
+		$arr = ['content' => call_user_func([$a->module_class, 'content'])];
 		Addon::callHooks($a->module . '_mod_aftercontent', $arr);
 		$a->page['content'] .= $arr['content'];
 	}
diff --git a/src/Database/DBStructure.php b/src/Database/DBStructure.php
index f8fc1651c..50566dc87 100644
--- a/src/Database/DBStructure.php
+++ b/src/Database/DBStructure.php
@@ -77,10 +77,9 @@ class DBStructure
 				The friendica developers released update %s recently,
 				but when I tried to install it, something went terribly wrong.
 				This needs to be fixed soon and I can't do it alone. Please contact a
-				friendica developer if you can not help me on your own. My database might be invalid."));
-			$body = L10n::t("The error message is\n[pre]%s[/pre]");
-			$preamble = sprintf($preamble, $update_id);
-			$body = sprintf($body, $error_message);
+				friendica developer if you can not help me on your own. My database might be invalid.",
+				$update_id));
+			$body = L10n::t("The error message is\n[pre]%s[/pre]", $error_message);
 
 			notification([
 				'uid'      => $admin['uid'],
@@ -90,6 +89,7 @@ class DBStructure
 				'body'     => $body,
 				'language' => $lang]
 			);
+			L10n::popLang();
 		}
 
 		//try the logger
diff --git a/src/LegacyModule.php b/src/LegacyModule.php
new file mode 100644
index 000000000..737101b5c
--- /dev/null
+++ b/src/LegacyModule.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace Friendica;
+
+/**
+ * This mock module enable class encapsulation of legacy global function modules.
+ * After having provided the module file name, all the methods will behave like a normal Module class.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class LegacyModule extends BaseModule
+{
+	/**
+	 * The module name, which is the name of the file (without the .php suffix)
+	 * It's used to check for existence of the module functions.
+	 *
+	 * @var string
+	 */
+	private static $moduleName = '';
+
+	/**
+	 * The only method that needs to be called, with the module/addon file name.
+	 *
+	 * @param string $file_path
+	 */
+	public static function setModuleFile($file_path)
+	{
+		if (!is_readable($file_path)) {
+			throw new Exception(Core\L10n::t('Legacy module file not found: %s', $file_path));
+		}
+
+		self::$moduleName = basename($file_path, '.php');
+
+		require_once $file_path;
+	}
+
+	public static function init()
+	{
+		self::runModuleFunction('init');
+	}
+
+	public static function content()
+	{
+		return self::runModuleFunction('content');
+	}
+
+	public static function post()
+	{
+		self::runModuleFunction('post');
+	}
+
+	public static function afterpost()
+	{
+		self::runModuleFunction('afterpost');
+	}
+
+	/**
+	 * Runs the module function designated by the provided suffix if it exists, the BaseModule method otherwise
+	 *
+	 * @param string $function_suffix
+	 * @return string
+	 */
+	private static function runModuleFunction($function_suffix)
+	{
+		$function_name = static::$moduleName . '_' . $function_suffix;
+
+		if (\function_exists($function_name)) {
+			return $function_name(self::getApp());
+		} else {
+			return parent::{$function_suffix}();
+		}
+	}
+}
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 2291b68e9..7295408d8 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -476,7 +476,7 @@ class Transmitter
 
 			foreach ($permissions[$element] as $receiver) {
 				if ($receiver == $item_profile['followers']) {
-					$inboxes = self::fetchTargetInboxesforUser($uid, $personal);
+					$inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 				} else {
 					$profile = APContact::getByURL($receiver, false);
 					if (!empty($profile)) {
diff --git a/src/Worker/DBClean.php b/src/Worker/DBClean.php
index ca0da954c..dba9cfd4c 100644
--- a/src/Worker/DBClean.php
+++ b/src/Worker/DBClean.php
@@ -63,7 +63,7 @@ class DBClean {
 		$count = 0;
 
 		// We split the deletion in many small tasks
-		$limit = 1000;
+		$limit = Config::get('system', 'dbclean-expire-limit', 1000);
 
 		// Get the expire days for step 8 and 9
 		$days = Config::get('system', 'dbclean-expire-days', 0);
@@ -275,7 +275,7 @@ class DBClean {
 	                                                                OR (`item`.`file` != '') OR (`item`.`event-id` != '')
 	                                                                OR (`item`.`attach` != '') OR `item`.`wall` OR `item`.`origin`)
 	                                                                AND `item`.`parent` = `thread`.`iid`)
-	                                ORDER BY `thread`.`iid` LIMIT 1000", $days, $last_id);
+	                                ORDER BY `thread`.`iid` LIMIT ?", $days, $last_id, $limit);
 			$count = DBA::numRows($r);
 			if ($count > 0) {
 				logger("found expired threads: ".$count);