Added ability to add redirects to deleted topic ids.

database/2023_04_30_001226_create_topic_redirs_table.php

@@ -0,0 +1,23 @@
+<?php
+use Index\Data\IDbConnection;
+use Index\Data\Migration\IDbMigration;
+
+final class CreateTopicRedirsTable_20230430_001226 implements IDbMigration {
+    public function migrate(IDbConnection $conn): void {
+        $conn->execute('
+            CREATE TABLE msz_forum_topics_redirects (
+                topic_id            INT(10) UNSIGNED NOT NULL,
+                user_id             INT(10) UNSIGNED NULL     DEFAULT NULL,
+                topic_redir_url     VARCHAR(255)     NOT NULL,
+                topic_redir_created TIMESTAMP        NOT NULL DEFAULT current_timestamp(),
+                PRIMARY KEY (topic_id),
+                KEY        topics_redirs_user_foreign (user_id),
+                CONSTRAINT topics_redirs_user_foreign
+                    FOREIGN KEY (user_id)
+                    REFERENCES msz_users (user_id)
+                    ON DELETE SET NULL
+                    ON UPDATE CASCADE
+            ) ENGINE=InnoDB COLLATE=utf8mb4_bin;
+        ');
+    }
+}