fix: improve test coverage accuracy and fix session timestamp bug

- Exclude seed files from coverage (not business logic)
- Fix Date.now() double call bug in createSession functions
- Coverage improved: 53.13% → 54.18%
- All 122 test suites passing

jest.config.js

@@ -8,6 +8,7 @@ module.exports = {
     '!src/**/*.d.ts',
     '!src/**/*.stories.{ts,tsx}',
     '!src/**/__tests__/**',
+    '!src/db/seed*.ts',
   ],
   coverageThreshold: {
     global: {

src/lib/auth/session.ts

@@ -9,10 +9,11 @@ export interface Session extends SessionData {
 }
 
 export function createSession(userData: SessionData): Session {
+  const now = Date.now();
   return {
     ...userData,
-    createdAt: Date.now(),
-    expiresAt: Date.now() + (24 * 60 * 60 * 1000),
+    createdAt: now,
+    expiresAt: now + (24 * 60 * 60 * 1000),
   };
 }
 
@@ -33,9 +34,10 @@ export function isSessionExpired(session: Session): boolean {
 }
 
 export function createSessionWithCustomExpiration(userData: SessionData, expiresInMs: number): Session {
+  const now = Date.now();
   return {
     ...userData,
-    createdAt: Date.now(),
-    expiresAt: Date.now() + expiresInMs,
+    createdAt: now,
+    expiresAt: now + expiresInMs,
   };
 }