diff --git a/classes/config.php b/classes/config.php
index 2c46e1784..ee1d3cb4a 100644
--- a/classes/config.php
+++ b/classes/config.php
@@ -107,8 +107,9 @@ class Config {
 	private static $instance;
 
 	private $params = [];
+	private $schema_version = null;
 
-	public static function get_instance() {
+	public static function get_instance() : Config {
 		if (self::$instance == null)
 			self::$instance = new self();
 
@@ -133,6 +134,20 @@ class Config {
 		}
 	}
 
+	static function get_schema_version(bool $nocache = false) {
+		return self::get_instance()->_schema_version($nocache);
+	}
+
+	function _schema_version(bool $nocache = false) {
+		if (empty($this->schema_version) || $nocache) {
+			$row = Db::pdo()->query("SELECT schema_version FROM ttrss_version")->fetch();
+
+			$this->schema_version = (int) $row["schema_version"];
+		}
+
+		return $this->schema_version;
+	}
+
 	static function cast_to(string $value, int $type_hint) {
 		switch ($type_hint) {
 			case self::T_BOOL:
diff --git a/classes/dbupdater.php b/classes/dbupdater.php
index e923c7fcb..d1df31b40 100644
--- a/classes/dbupdater.php
+++ b/classes/dbupdater.php
@@ -12,8 +12,7 @@ class DbUpdater {
 	}
 
 	function get_schema_version() {
-		$row = $this->pdo->query("SELECT schema_version FROM ttrss_version")->fetch();
-		return (int) $row['schema_version'];
+		return Config::get_schema_version(true);
 	}
 
 	function is_update_required() {
diff --git a/classes/feeds.php b/classes/feeds.php
index c5f868b1d..416e1c026 100755
--- a/classes/feeds.php
+++ b/classes/feeds.php
@@ -334,7 +334,7 @@ class Feeds extends Handler_Protected {
 				/* we don't need those */
 
 				foreach (["date_entered", "guid", "last_published", "last_marked", "tag_cache", "favicon_avg_color",
-								"uuid", "label_cache", "yyiw"] as $k)
+								"uuid", "label_cache", "yyiw", "num_enclosures"] as $k)
 					unset($line[$k]);
 
 				array_push($reply['content'], $line);
diff --git a/classes/prefs.php b/classes/prefs.php
index 5ce1b6104..dabe5eac6 100644
--- a/classes/prefs.php
+++ b/classes/prefs.php
@@ -137,7 +137,7 @@ class Prefs {
 	/** @var PDO */
 	private $pdo;
 
-	public static function get_instance() {
+	public static function get_instance() : Prefs {
 		if (self::$instance == null)
 			self::$instance = new self();
 
diff --git a/classes/rssutils.php b/classes/rssutils.php
index b6aecb8c9..11a94162c 100755
--- a/classes/rssutils.php
+++ b/classes/rssutils.php
@@ -53,11 +53,9 @@ class RSSUtils {
 	}
 
 	static function update_daemon_common($limit = null, $options = []) {
-		$schema_version = get_schema_version();
-
 		if (!$limit) $limit = Config::get(Config::DAEMON_FEED_LIMIT);
 
-		if ($schema_version != SCHEMA_VERSION) {
+		if (get_schema_version() != SCHEMA_VERSION) {
 			die("Schema version is wrong, please upgrade the database.\n");
 		}
 
diff --git a/include/functions.php b/include/functions.php
index 746f8d39e..6d845035e 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -166,8 +166,6 @@
 	define('SELF_USER_AGENT', 'Tiny Tiny RSS/' . get_version() . ' (http://tt-rss.org/)');
 	ini_set('user_agent', SELF_USER_AGENT);
 
-	$schema_version = false;
-
 	/* compat shims */
 
 	function _debug($msg) {
@@ -306,13 +304,7 @@
 	}
 
 	function get_schema_version() {
-		$pdo = Db::pdo();
-
-		$row = $pdo->query("SELECT schema_version FROM ttrss_version")->fetch();
-		$version = $row["schema_version"];
-		$schema_version = $version;
-
-		return $version;
+		return Config::get_schema_version();
 	}
 
 	function file_is_locked($filename) {
diff --git a/include/sessions.php b/include/sessions.php
index 23815e182..891a6b3fa 100644
--- a/include/sessions.php
+++ b/include/sessions.php
@@ -19,25 +19,10 @@
 	ini_set("session.gc_maxlifetime", $session_expire);
 	ini_set("session.cookie_lifetime", "0");
 
-	function session_get_schema_version() {
-		global $schema_version;
-
-		if (!$schema_version) {
-			$row = \Db::pdo()->query("SELECT schema_version FROM ttrss_version")->fetch();
-
-			$version = $row["schema_version"];
-
-			$schema_version = $version;
-			return $version;
-		} else {
-			return $schema_version;
-		}
-	}
-
 	function validate_session() {
 		if (\Config::get(\Config::SINGLE_USER_MODE)) return true;
 
-		if (isset($_SESSION["ref_schema_version"]) && $_SESSION["ref_schema_version"] != session_get_schema_version()) {
+		if (isset($_SESSION["ref_schema_version"]) && $_SESSION["ref_schema_version"] != \Config::get_schema_version()) {
 			$_SESSION["login_error_msg"] =
 				__("Session failed to validate (schema version changed)");
 			return false;
diff --git a/update.php b/update.php
index bcb6d6d12..aab84bfdb 100755
--- a/update.php
+++ b/update.php
@@ -145,9 +145,7 @@
 	}
 
 	if (!isset($options['update-schema'])) {
-		$schema_version = get_schema_version();
-
-		if ($schema_version != SCHEMA_VERSION) {
+		if (get_schema_version() != SCHEMA_VERSION) {
 			die("Schema version is wrong, please upgrade the database (--update-schema).\n");
 		}
 	}
diff --git a/update_daemon2.php b/update_daemon2.php
index b75f06ae5..1e8b1d072 100755
--- a/update_daemon2.php
+++ b/update_daemon2.php
@@ -188,9 +188,7 @@
 			"Maybe another daemon is already running.\n");
 	}
 
-	$schema_version = get_schema_version();
-
-	if ($schema_version != SCHEMA_VERSION) {
+	if (get_schema_version() != SCHEMA_VERSION) {
 		die("Schema version is wrong, please upgrade the database.\n");
 	}