fixup! feat: extend Entity and adjust QBMapper to support Snowflake IDs

Author: miaulalala

lib/public/AppFramework/Db/SnowflakeAwareEntity.php

@@ -43,7 +43,7 @@ public function getCreatedAt(): ?\DateTimeImmutable {
 	}
 
 	public function getSnowflake(): ?Snowflake {
-		if (empty($this->id)) {
+		if ($this->id === null) {
 			return null;
 		}