Fix reminder scheduling and add group features

- Fix reminder duplicate bug: use slot-only keys to prevent multiple reminders when settings change
- Add New Jackpot announcement delay setting for groups (default 5 min)
- Cancel unpaid purchases after draw completes (prevents payments for past rounds)
- Add BotFather commands template file
- Update README documentation

telegram_bot/src/handlers/groups.ts

@@ -6,6 +6,7 @@ import {
   GroupSettings, 
   REMINDER_PRESETS, 
   ANNOUNCEMENT_DELAY_OPTIONS,
+  NEW_JACKPOT_DELAY_OPTIONS,
   DEFAULT_GROUP_REMINDER_SLOTS,
   ReminderTime,
   formatReminderTime,
@@ -268,6 +269,20 @@ export async function handleGroupSettingsCallback(
       }
     }
 
+    // Handle new jackpot delay selection
+    if (action.startsWith('newjackpot_delay_')) {
+      const minutes = parseInt(action.replace('newjackpot_delay_', ''), 10);
+      if (!isNaN(minutes)) {
+        updatedSettings = await groupStateManager.updateNewJackpotDelay(chatId, minutes);
+        if (updatedSettings) {
+          logUserAction(userId, 'Updated new jackpot delay', { groupId: chatId, minutes });
+          await bot.answerCallbackQuery(query.id, { 
+            text: minutes === 0 ? 'Announce immediately' : `Announce ${minutes} min after new jackpot` 
+          });
+        }
+      }
+    }
+
     // Handle reminder time adjustments (reminder1_add_1_hours, reminder2_sub_1_days, etc.)
     const reminderTimeMatch = action.match(/^reminder(\d)_(add|sub)_(\d+)_(minutes|hours|days)$/);
     if (reminderTimeMatch) {
@@ -334,7 +349,7 @@ export async function handleGroupSettingsCallback(
 
 
 /**
- * Format delay option for display
+ * Format delay option for display (seconds)
  */
 function formatDelayOption(seconds: number): string {
   if (seconds === 0) return 'Instant';
@@ -345,6 +360,14 @@ function formatDelayOption(seconds: number): string {
   return `${seconds}s`;
 }
 
+/**
+ * Format new jackpot delay option for display (minutes)
+ */
+function formatNewJackpotDelay(minutes: number): string {
+  if (minutes === 0) return 'Instant';
+  return minutes === 1 ? '1 min' : `${minutes} min`;
+}
+
 /**
  * Get time adjustment buttons for a reminder slot
  */
@@ -385,12 +408,23 @@ function getGroupSettingsKeyboard(settings: GroupSettings): TelegramBot.InlineKe
       text: `${onOff(settings.newJackpotAnnouncement)} New Jackpot Announcement`,
       callback_data: 'group_toggle_newjackpot',
     }],
-    [{
-      text: `${onOff(settings.drawAnnouncements)} Draw Result Announcements`,
-      callback_data: 'group_toggle_announcements',
-    }],
   ];
 
+  // Add new jackpot delay options if enabled
+  if (settings.newJackpotAnnouncement !== false) {
+    keyboard.push(
+      NEW_JACKPOT_DELAY_OPTIONS.map(minutes => ({
+        text: `${selected(settings.newJackpotDelayMinutes ?? 5, minutes)} ${formatNewJackpotDelay(minutes)}`,
+        callback_data: `group_newjackpot_delay_${minutes}`,
+      }))
+    );
+  }
+
+  keyboard.push([{
+    text: `${onOff(settings.drawAnnouncements)} Draw Result Announcements`,
+    callback_data: 'group_toggle_announcements',
+  }]);
+
   // Add announcement delay options if announcements are enabled
   if (settings.drawAnnouncements) {
     keyboard.push(