2603.8 purging old records

setup.php

@@ -41,4 +41,14 @@ if ($row > 0) {
     echo "Dropped legacy uq_event unique key.\n";
 }
 
+// Migration: create settings table and seed default retention if upgrading
+$pdo->exec(
+    "CREATE TABLE IF NOT EXISTS settings (
+        key_name VARCHAR(64) NOT NULL,
+        value    TEXT        NOT NULL,
+        PRIMARY KEY (key_name)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
+);
+$pdo->exec("INSERT IGNORE INTO settings (key_name, value) VALUES ('retention_days', '7')");
+
 echo "Database '" . DB_NAME . "' and tables created/migrated successfully.\n";