diff --git a/src/Upgrades/Upgrade13.php b/src/Upgrades/Upgrade13.php
new file mode 100644
index 00000000..17f740f6
--- /dev/null
+++ b/src/Upgrades/Upgrade13.php
@@ -0,0 +1,54 @@
+<?php
+namespace Szurubooru\Upgrades;
+
+class Upgrade13 implements IUpgrade
+{
+	public function run(\Szurubooru\DatabaseConnection $databaseConnection)
+	{
+		$pdo = $databaseConnection->getPDO();
+
+		$pdo->exec('DROP TRIGGER postTagsDelete');
+		$pdo->exec('DROP TRIGGER favoritesDelete');
+		$pdo->exec('DROP TRIGGER favoritesInsert');
+		$pdo->exec('DROP TRIGGER favoritesUpdate');
+
+		$pdo->exec('
+			CREATE TRIGGER postTagsDelete AFTER DELETE ON postTags
+			FOR EACH ROW
+			BEGIN
+				UPDATE posts SET tagCount = tagCount - 1 WHERE posts.id = OLD.postId;
+				UPDATE tags SET usages = usages - 1 WHERE tags.id = OLD.tagId;
+			END');
+
+		$pdo->exec('
+			CREATE TRIGGER favoritesDelete AFTER DELETE ON favorites
+			FOR EACH ROW
+			BEGIN
+				UPDATE posts SET
+					favCount = (SELECT COUNT(1) FROM favorites WHERE favorites.postId = posts.id),
+					lastFavTime = (SELECT MAX(time) FROM favorites WHERE favorites.postId = posts.id)
+					WHERE posts.id = OLD.postId;
+			END');
+
+		$pdo->exec('
+			CREATE TRIGGER favoritesInsert AFTER INSERT ON favorites
+			FOR EACH ROW
+			BEGIN
+				UPDATE posts SET
+					favCount = (SELECT COUNT(1) FROM favorites WHERE favorites.postId = posts.id),
+					lastFavTime = (SELECT MAX(time) FROM favorites WHERE favorites.postId = posts.id)
+					WHERE posts.id = NEW.postId;
+			END');
+
+		$pdo->exec('
+			CREATE TRIGGER favoritesUpdate AFTER UPDATE ON favorites
+			FOR EACH ROW
+			BEGIN
+				UPDATE posts SET
+					favCount = (SELECT COUNT(1) FROM favorites WHERE favorites.postId = posts.id),
+					lastFavTime = (SELECT MAX(time) FROM favorites WHERE favorites.postId = posts.id)
+					WHERE posts.id IN (OLD.postId, NEW.postId);
+			END');
+
+	}
+}
diff --git a/src/di.php b/src/di.php
index bb835e0c..b898a0c9 100644
--- a/src/di.php
+++ b/src/di.php
@@ -28,6 +28,7 @@ return [
 			$container->get(\Szurubooru\Upgrades\Upgrade10::class),
 			$container->get(\Szurubooru\Upgrades\Upgrade11::class),
 			$container->get(\Szurubooru\Upgrades\Upgrade12::class),
+			$container->get(\Szurubooru\Upgrades\Upgrade13::class),
 		];
 	}),