fix: ensure poll unpins reliably and remove duplicate quiz

- Remove the extra Wednesday 16:19 send_quiz job; only the Friday 17:00
  quiz remains, matching the /start description. The duplicate send
  overwrote the poll mapping, orphaning the earlier pinned poll so it
  was never unpinned.
- Extract unpinPoll() and call it at the start of CreatePairs so the
  poll is always unpinned, even when no pairs can be formed (previously
  early returns skipped the unpin block entirely).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cmd/handlers.go

@@ -391,8 +391,37 @@ func appendUnpairedMessage(ctx context.Context, db *sql.DB, message string, grou
 	return message
 }
 
+// unpinPoll unpins the active poll for the group and removes its mapping.
+// Safe to call even if there is no active poll.
+func unpinPoll(ctx context.Context, db *sql.DB, api echotron.API, groupID int64) {
+	pollMapping, err := database.GetPollMappingByGroupID(ctx, db, groupID)
+	if err != nil {
+		log.Warn().Err(err).Int64("group_id", groupID).Msg("GetPollMappingByGroupID failed (no active poll)")
+		return
+	}
+	if pollMapping == nil {
+		return
+	}
+
+	_, err = api.UnpinChatMessage(groupID, &echotron.UnpinMessageOptions{MessageID: int(pollMapping.MessageID)})
+	if err != nil {
+		log.Warn().Err(err).Int64("group_id", groupID).Int64("message_id", pollMapping.MessageID).Msg("UnpinChatMessage failed (check bot permissions)")
+	} else {
+		log.Info().Int64("group_id", groupID).Int64("message_id", pollMapping.MessageID).Msg("Poll message unpinned")
+	}
+
+	// Delete poll mapping after attempting to unpin (even if unpin failed)
+	if err := database.DeletePollMapping(ctx, db, groupID); err != nil {
+		log.Warn().Err(err).Int64("group_id", groupID).Msg("DeletePollMapping failed")
+	}
+}
+
 // CreatePairs generates random pairs
 func CreatePairs(ctx context.Context, db *sql.DB, api echotron.API, groupID int64) {
+	// Always unpin the active poll first, regardless of whether pairs get
+	// created below — otherwise an early return would leave the poll pinned.
+	unpinPoll(ctx, db, api, groupID)
+
 	availablePairs, err := database.GetAvailablePairs(ctx, db, groupID)
 	if err != nil {
 		log.Error().Err(err).Int64("group_id", groupID).Msg("GetAvailablePairs failed")
@@ -428,24 +457,6 @@ func CreatePairs(ctx context.Context, db *sql.DB, api echotron.API, groupID int6
 
 	sendMessage(api, message, groupID)
 
-	// Unpin the poll message
-	pollMapping, err := database.GetPollMappingByGroupID(ctx, db, groupID)
-	if err != nil {
-		log.Warn().Err(err).Int64("group_id", groupID).Msg("GetPollMappingByGroupID failed (no active poll)")
-	} else if pollMapping != nil {
-		_, err = api.UnpinChatMessage(groupID, &echotron.UnpinMessageOptions{MessageID: int(pollMapping.MessageID)})
-		if err != nil {
-			log.Warn().Err(err).Int64("group_id", groupID).Int64("message_id", pollMapping.MessageID).Msg("UnpinChatMessage failed (check bot permissions)")
-		} else {
-			log.Info().Int64("group_id", groupID).Int64("message_id", pollMapping.MessageID).Msg("Poll message unpinned")
-		}
-
-		// Delete poll mapping after attempting to unpin (even if unpin failed)
-		if err := database.DeletePollMapping(ctx, db, groupID); err != nil {
-			log.Warn().Err(err).Int64("group_id", groupID).Msg("DeletePollMapping failed")
-		}
-	}
-
 	if err = database.ClearAllParticipants(ctx, db, groupID); err != nil {
 		log.Error().Err(err).Int64("group_id", groupID).Msg("ClearAllParticipants failed")
 	}

cmd/main.go

@@ -206,8 +206,6 @@ func startScheduler(db *sql.DB, api echotron.API, stopChan chan struct{}) {
 	// Friday 17:00 - send quiz
 	scheduleJob("send_quiz", time.Friday, 17, 0, SendQuizToAllGroups, db, api, stopChan, moscowTZ)
 
-	scheduleJob("send_quiz", time.Wednesday, 16, 19, SendQuizToAllGroups, db, api, stopChan, moscowTZ)
-
 	// Sunday 19:00 - create pairs
 	scheduleJob("create_pairs", time.Sunday, 19, 0, CreatePairsForAllGroups, db, api, stopChan, moscowTZ)