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/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) {