Use PHP constants for literals

src/Model/User.php

@@ -1113,9 +1113,15 @@ class User
 			FROM `user`
 			INNER JOIN `profile` ON `profile`.`uid` = `user`.`uid`
 			INNER JOIN `contact` ON `contact`.`uid` = `user`.`uid` AND `contact`.`self`
-			WHERE `user`.`verified` AND `user`.`login_date` > '0001-01-01' AND NOT `user`.`account-type` = 3
-				AND NOT `user`.`blocked` AND NOT `user`.`account_removed`
-				AND NOT `user`.`account_expired`");
+			WHERE `user`.`verified`
+				AND `user`.`login_date` > ?
+				AND `user`.`account-type` != ?
+				AND NOT `user`.`blocked`
+				AND NOT `user`.`account_removed`
+				AND NOT `user`.`account_expired`",
+				DBA::NULL_DATETIME,
+				self::ACCOUNT_TYPE_COMMUNITY
+		);
 
 		if (!DBA::isResult($userStmt)) {
 			return $statistics;