fix(#414): update session config to 7d absolute, 2h idle timeout

- expiresIn: 7 days (was 24 hours)
- updateAge: 2 hours idle timeout with sliding window
- Explicit cookie attributes: httpOnly, secure in production, sameSite=lax
- Existing sessions expire naturally under old rules

Refs #414

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/auth/auth.config.spec.ts

@@ -18,7 +18,12 @@ vi.mock("better-auth/adapters/prisma", () => ({
   prismaAdapter: (...args: unknown[]) => mockPrismaAdapter(...args),
 }));
 
-import { isOidcEnabled, validateOidcConfig, createAuth } from "./auth.config";
+import {
+  isOidcEnabled,
+  validateOidcConfig,
+  createAuth,
+  getTrustedOrigins,
+} from "./auth.config";
 
 describe("auth.config", () => {
   // Store original env vars to restore after each test
@@ -32,6 +37,9 @@ describe("auth.config", () => {
     delete process.env.OIDC_CLIENT_SECRET;
     delete process.env.OIDC_REDIRECT_URI;
     delete process.env.NODE_ENV;
+    delete process.env.NEXT_PUBLIC_APP_URL;
+    delete process.env.NEXT_PUBLIC_API_URL;
+    delete process.env.TRUSTED_ORIGINS;
   });
 
   afterEach(() => {
@@ -281,4 +289,104 @@ describe("auth.config", () => {
       expect(mockGenericOAuth).not.toHaveBeenCalled();
     });
   });
+
+  describe("createAuth - session and cookie configuration", () => {
+    beforeEach(() => {
+      mockGenericOAuth.mockClear();
+      mockBetterAuth.mockClear();
+      mockPrismaAdapter.mockClear();
+    });
+
+    it("should configure session expiresIn to 7 days (604800 seconds)", () => {
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        session: { expiresIn: number; updateAge: number };
+      };
+      expect(config.session.expiresIn).toBe(604800);
+    });
+
+    it("should configure session updateAge to 2 hours (7200 seconds)", () => {
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        session: { expiresIn: number; updateAge: number };
+      };
+      expect(config.session.updateAge).toBe(7200);
+    });
+
+    it("should set httpOnly cookie attribute to true", () => {
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        advanced: {
+          defaultCookieAttributes: {
+            httpOnly: boolean;
+            secure: boolean;
+            sameSite: string;
+          };
+        };
+      };
+      expect(config.advanced.defaultCookieAttributes.httpOnly).toBe(true);
+    });
+
+    it("should set sameSite cookie attribute to lax", () => {
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        advanced: {
+          defaultCookieAttributes: {
+            httpOnly: boolean;
+            secure: boolean;
+            sameSite: string;
+          };
+        };
+      };
+      expect(config.advanced.defaultCookieAttributes.sameSite).toBe("lax");
+    });
+
+    it("should set secure cookie attribute to true in production", () => {
+      process.env.NODE_ENV = "production";
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        advanced: {
+          defaultCookieAttributes: {
+            httpOnly: boolean;
+            secure: boolean;
+            sameSite: string;
+          };
+        };
+      };
+      expect(config.advanced.defaultCookieAttributes.secure).toBe(true);
+    });
+
+    it("should set secure cookie attribute to false in non-production", () => {
+      process.env.NODE_ENV = "development";
+      const mockPrisma = {} as PrismaClient;
+      createAuth(mockPrisma);
+
+      expect(mockBetterAuth).toHaveBeenCalledOnce();
+      const config = mockBetterAuth.mock.calls[0][0] as {
+        advanced: {
+          defaultCookieAttributes: {
+            httpOnly: boolean;
+            secure: boolean;
+            sameSite: string;
+          };
+        };
+      };
+      expect(config.advanced.defaultCookieAttributes.secure).toBe(false);
+    });
+  });
 });