Study: lesson reminders on by default for new accounts; one-time backfill turns them on for existing accounts; v2.46.0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/data.js

@@ -1421,6 +1421,7 @@ export function sanitizeStudyUsers(value) {
       remindersPausedUntil: typeof item?.remindersPausedUntil === 'string' ? item.remindersPausedUntil : null,
       reminderFrequency: item?.reminderFrequency === 'weekly' ? 'weekly' : 'immediate',
       weeklyDigestSentAt: typeof item?.weeklyDigestSentAt === 'string' ? item.weeklyDigestSentAt : null,
+      remindersDefaultedAt: typeof item?.remindersDefaultedAt === 'string' ? item.remindersDefaultedAt : null,
     })
   }
   return out.slice(0, MAX_STUDY_USERS)

server/routes/study-auth.js

@@ -117,7 +117,8 @@ export function register(app) {
       passwordHash: hashStudyPassword(password),
       displayName,
       subscribeNewsletter: subscribe,
-      studyRemindersEnabled: false,
+      studyRemindersEnabled: true,
+      remindersDefaultedAt: now,
       pendingEmailChange: null,
       emailVerified: false,
       pendingEmailVerification: {

server/study-helpers.js

@@ -736,6 +736,23 @@ export function extractResendMessageId(result) {
   return ''
 }
 
+// One-off pass: lesson reminders are now on by default, so switch them on for accounts that
+// predate the default. Each account is marked as it is handled, so a later opt-out sticks.
+export async function backfillReminderDefault() {
+  const now = new Date().toISOString()
+  let updated = 0
+  for (const user of state.studyUsers) {
+    if (user.remindersDefaultedAt) continue
+    if (user.studyRemindersEnabled !== true) {
+      user.studyRemindersEnabled = true
+      updated++
+    }
+    user.remindersDefaultedAt = now
+  }
+  if (state.studyUsers.some(user => user.remindersDefaultedAt === now)) queueStudyUsersWrite()
+  return updated
+}
+
 // ── Study reminder scheduler ───────────────────────────────────────────────
 
 export async function scheduleStudyReminders(sendStudyReminderEmail) {