fix: Wave 3 auth session lifecycle and timezone reset safety

src/__tests__/commission-monthly-reset.test.ts

@@ -78,11 +78,11 @@ describe('Commission Tier Monthly Reset Flow', () => {
   it('should identify when monthly reset is needed', () => {
     // Current month's reset should not need reset
     const now = new Date()
-    const currentMonthStart = new Date(now.getFullYear(), now.getMonth(), 1)
+    const currentMonthStart = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), 1, 0, 0, 0, 0))
     expect(shouldResetMonthlyVolume(currentMonthStart.toISOString())).toBe(false)
 
     // Last month's reset should need reset
-    const lastMonthStart = new Date(now.getFullYear(), now.getMonth() - 1, 1)
+    const lastMonthStart = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth() - 1, 1, 0, 0, 0, 0))
     expect(shouldResetMonthlyVolume(lastMonthStart.toISOString())).toBe(true)
 
     // Null should need reset

src/app/api/auth/login/route.ts

@@ -51,13 +51,14 @@ export async function POST(request: NextRequest) {
       },
     });
 
-    // Set httpOnly cookies for secure session persistence
+    // Set httpOnly cookies for secure session persistence with explicit path
     response.cookies.set({
       name: 'sb-access-token',
       value: data.session.access_token,
       httpOnly: true,
       secure: process.env.NODE_ENV === 'production',
       sameSite: 'lax',
+      path: '/',
       maxAge: data.session.expires_in,
     });
 
@@ -67,6 +68,7 @@ export async function POST(request: NextRequest) {
       httpOnly: true,
       secure: process.env.NODE_ENV === 'production',
       sameSite: 'lax',
+      path: '/',
       maxAge: 60 * 60 * 24 * 7, // 7 days
     });
 

src/app/api/auth/logout/route.ts

@@ -2,24 +2,40 @@ import { NextRequest, NextResponse } from 'next/server';
 import { getSupabase } from '@/lib/db';
 import * as Sentry from '@sentry/nextjs';
 
-export async function POST(_request: NextRequest) {
+export async function POST(request: NextRequest) {
   try {
     const supabase = getSupabase();
-    const { error } = await supabase.auth.signOut();
+
+    // Retrieve cookies to populate session state
+    const accessToken = request.cookies.get('sb-access-token')?.value;
+    const refreshToken = request.cookies.get('sb-refresh-token')?.value;
+
+    if (accessToken && refreshToken) {
+      await supabase.auth.setSession({
+        access_token: accessToken,
+        refresh_token: refreshToken,
+      });
+    }
+
+    // Call signOut with global scope to invalidate session in Supabase DB
+    const { error } = await supabase.auth.signOut({ scope: 'global' });
 
     if (error) {
       Sentry.captureException(error);
-      return NextResponse.json(
-        { error: error.message },
+      const errorResponse = NextResponse.json(
+        { error: 'Logout failed' },
         { status: 400 }
       );
+      errorResponse.cookies.set('sb-access-token', '', { path: '/', maxAge: 0 });
+      errorResponse.cookies.set('sb-refresh-token', '', { path: '/', maxAge: 0 });
+      return errorResponse;
     }
 
     const response = NextResponse.json({ message: 'Logout successful' });
 
-    // Clear session cookies
-    response.cookies.delete('sb-access-token');
-    response.cookies.delete('sb-refresh-token');
+    // Clear session cookies using explicit path
+    response.cookies.set('sb-access-token', '', { path: '/', maxAge: 0 });
+    response.cookies.set('sb-refresh-token', '', { path: '/', maxAge: 0 });
 
     return response;
   } catch (error) {

src/app/api/auth/refresh/route.ts

@@ -4,7 +4,16 @@ import * as Sentry from '@sentry/nextjs';
 
 export async function POST(request: NextRequest) {
   try {
-    const { refreshToken } = await request.json();
+    let refreshToken = request.cookies.get('sb-refresh-token')?.value;
+
+    if (!refreshToken) {
+      try {
+        const body = await request.json();
+        refreshToken = body.refreshToken;
+      } catch {
+        // Ignore JSON parsing errors if cookie was expected
+      }
+    }
 
     if (!refreshToken) {
       return NextResponse.json(
@@ -24,40 +33,46 @@ export async function POST(request: NextRequest) {
       if (!error && !data.session) {
         Sentry.captureException(new Error('Token refresh: no error but no session'));
       }
-      return NextResponse.json(
+      const errorResponse = NextResponse.json(
         { error: 'Token refresh failed' },
         { status: 401 }
       );
+      errorResponse.cookies.set('sb-access-token', '', { path: '/', maxAge: 0 });
+      errorResponse.cookies.set('sb-refresh-token', '', { path: '/', maxAge: 0 });
+      return errorResponse;
     }
 
     const response = NextResponse.json({
       message: 'Token refreshed successfully',
       session: {
         access_token: data.session.access_token,
+        refresh_token: data.session.refresh_token,
         expires_in: data.session.expires_in,
         expires_at: data.session.expires_at,
         token_type: 'Bearer',
       },
     });
 
-    // Update access token cookie
+    // Update access token cookie with explicit path
     response.cookies.set({
       name: 'sb-access-token',
       value: data.session.access_token,
       httpOnly: true,
       secure: process.env.NODE_ENV === 'production',
       sameSite: 'lax',
+      path: '/',
       maxAge: data.session.expires_in,
     });
 
-    // Update refresh token cookie if provided
+    // Update refresh token cookie if provided with explicit path
     if (data.session.refresh_token) {
       response.cookies.set({
         name: 'sb-refresh-token',
         value: data.session.refresh_token,
         httpOnly: true,
         secure: process.env.NODE_ENV === 'production',
         sameSite: 'lax',
+        path: '/',
         maxAge: 60 * 60 * 24 * 7, // 7 days
       });
     }

src/lib/commissions/monthlyResetScheduler.ts

@@ -32,8 +32,8 @@ export function shouldResetMonthlyVolume(resetAt: string | null): boolean {
   const lastReset = new Date(resetAt);
   const now = new Date();
 
-  // Get start of current month (00:00:00 on the 1st)
-  const startOfCurrentMonth = new Date(now.getFullYear(), now.getMonth(), 1);
+  // Get start of current month in UTC (00:00:00 on the 1st) to align timezone logic
+  const startOfCurrentMonth = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), 1, 0, 0, 0, 0));
 
   return lastReset < startOfCurrentMonth;
 }