diff --git a/open-sse/executors/codex.ts b/open-sse/executors/codex.ts
index e0bf19ddd5..e04f7d172f 100644
--- a/open-sse/executors/codex.ts
+++ b/open-sse/executors/codex.ts
@@ -495,12 +495,18 @@ export class CodexExecutor extends BaseExecutor {
 
       // Codex still requires a non-empty instructions field.
       // Use a minimal placeholder if the client didn't provide one.
-      if (!body.instructions || (typeof body.instructions === "string" && body.instructions.trim() === "")) {
+      if (
+        !body.instructions ||
+        (typeof body.instructions === "string" && body.instructions.trim() === "")
+      ) {
         body.instructions = "Follow the developer instructions in the conversation.";
       }
     } else {
       // Translated path: hoist system messages to instructions (legacy behavior).
-      if (!body.instructions || (typeof body.instructions === "string" && body.instructions.trim() === "")) {
+      if (
+        !body.instructions ||
+        (typeof body.instructions === "string" && body.instructions.trim() === "")
+      ) {
         body.instructions = CODEX_DEFAULT_INSTRUCTIONS;
       }
       hoistSystemMessagesToInstructions(body);
diff --git a/open-sse/mcp-server/__tests__/audit.test.ts b/open-sse/mcp-server/__tests__/audit.test.ts
index e1c7a7a714..90e5713a58 100644
--- a/open-sse/mcp-server/__tests__/audit.test.ts
+++ b/open-sse/mcp-server/__tests__/audit.test.ts
@@ -24,6 +24,7 @@ describe("MCP audit shutdown", () => {
 
   beforeEach(() => {
     vi.resetModules();
+    globalThis.__omnirouteMcpAuditDb = undefined;
     dataDir = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-mcp-audit-"));
     dbFile = path.join(dataDir, "storage.sqlite");
     fs.writeFileSync(dbFile, "");
@@ -32,6 +33,7 @@ describe("MCP audit shutdown", () => {
 
   afterEach(() => {
     delete process.env.DATA_DIR;
+    globalThis.__omnirouteMcpAuditDb = undefined;
     vi.restoreAllMocks();
   });
 
diff --git a/open-sse/mcp-server/audit.ts b/open-sse/mcp-server/audit.ts
index 6ac75eb0a0..18897035e0 100644
--- a/open-sse/mcp-server/audit.ts
+++ b/open-sse/mcp-server/audit.ts
@@ -23,6 +23,10 @@ interface AuditDatabase {
   open?: boolean;
 }
 
+declare global {
+  var __omnirouteMcpAuditDb: AuditDatabase | null | undefined;
+}
+
 interface AuditStatsRow {
   total: unknown;
   successRate: unknown;
@@ -124,7 +128,13 @@ function buildAuditFilterSql(filters: McpAuditQuery): { whereSql: string; params
   };
 }
 
-let db: AuditDatabase | null = null;
+function getCachedAuditDb(): AuditDatabase | null {
+  return globalThis.__omnirouteMcpAuditDb ?? null;
+}
+
+function setCachedAuditDb(database: AuditDatabase | null): void {
+  globalThis.__omnirouteMcpAuditDb = database;
+}
 
 function toNumber(value: unknown, fallback = 0): number {
   const parsed =
@@ -145,7 +155,8 @@ function toString(value: unknown): string {
  * Uses the same SQLite database as the main OmniRoute app.
  */
 async function getDb(): Promise<AuditDatabase | null> {
-  if (db) return db;
+  const cachedDb = getCachedAuditDb();
+  if (cachedDb) return cachedDb;
 
   try {
     // Try importing the db module from the main app
@@ -165,8 +176,9 @@ async function getDb(): Promise<AuditDatabase | null> {
     const Database = (await import("better-sqlite3")).default as unknown as new (
       dbPath: string
     ) => AuditDatabase;
-    db = new Database(dbPath);
-    return db;
+    const database = new Database(dbPath);
+    setCachedAuditDb(database);
+    return database;
   } catch (err: unknown) {
     const message = err instanceof Error ? err.message : String(err);
     console.error("[MCP Audit] Failed to connect to database:", message);
@@ -175,10 +187,10 @@ async function getDb(): Promise<AuditDatabase | null> {
 }
 
 export function closeAuditDb(): boolean {
-  if (!db) return false;
+  const database = getCachedAuditDb();
+  if (!database) return false;
 
-  const database = db;
-  db = null;
+  setCachedAuditDb(null);
 
   try {
     try {