fix: memory improvements

- SQLite: enable WAL mode and PRAGMA performance settings

- ws.ts (public + private): fix clientConfigVersions memory leak

- internal server: add rate limiting and request timeouts

- audit log: fix flush re-queue feedback loop

- memory: add monitoring instrumentation

- security: remove debug log of full request body

server/index.ts

@@ -24,6 +24,29 @@ import license from "#dynamic/license/license";
 import { initLogCleanupInterval } from "@server/lib/cleanupLogs";
 import { initAcmeCertSync } from "#dynamic/lib/acmeCertSync";
 import { fetchServerIp } from "@server/lib/serverIpService";
+import logger from "@server/logger";
+
+/**
+ * Periodic memory usage logging for monitoring and leak detection.
+ * Logs heap usage, external (native) memory, and RSS every 60 seconds.
+ * This is lightweight (single process.memoryUsage() call) and provides
+ * the data needed to detect slow memory growth over hours/days.
+ */
+function startMemoryMonitor(): void {
+    const INTERVAL_MS = 60_000; // every 60 seconds
+    const timer = setInterval(() => {
+        const mem = process.memoryUsage();
+        logger.info(
+            `Memory usage - ` +
+            `heapUsed: ${(mem.heapUsed / 1024 / 1024).toFixed(1)}MB, ` +
+            `heapTotal: ${(mem.heapTotal / 1024 / 1024).toFixed(1)}MB, ` +
+            `rss: ${(mem.rss / 1024 / 1024).toFixed(1)}MB, ` +
+            `external: ${(mem.external / 1024 / 1024).toFixed(1)}MB, ` +
+            `arrayBuffers: ${(mem.arrayBuffers / 1024 / 1024).toFixed(1)}MB`
+        );
+    }, INTERVAL_MS);
+    timer.unref();
+}
 
 async function startServers() {
     await setHostMeta();
@@ -42,6 +65,9 @@ async function startServers() {
     initLogCleanupInterval();
     initAcmeCertSync();
 
+    // Start memory monitoring for leak detection
+    startMemoryMonitor();
+
     // Start all servers
     const apiServer = createApiServer();
     const internalServer = createInternalServer();