diff --git a/workspace-server/cmd/server/main.go b/workspace-server/cmd/server/main.go
index e8918db2f..04dff6d57 100644
--- a/workspace-server/cmd/server/main.go
+++ b/workspace-server/cmd/server/main.go
@@ -149,8 +149,13 @@ func main() {
 				result, err := db.DB.ExecContext(ctx, `DELETE FROM activity_logs WHERE created_at < now() - ($1 || ' days')::interval`, retentionDays)
 				if err != nil {
 					log.Printf("Activity log cleanup error: %v", err)
-				} else if n, _ := result.RowsAffected(); n > 0 {
-					log.Printf("Activity log cleanup: purged %d old entries", n)
+				} else {
+					n, err := result.RowsAffected()
+					if err != nil {
+						log.Printf("Activity log cleanup RowsAffected error: %v", err)
+					} else if n > 0 {
+						log.Printf("Activity log cleanup: purged %d old entries", n)
+					}
 				}
 			}
 		}
diff --git a/workspace-server/internal/channels/manager.go b/workspace-server/internal/channels/manager.go
index 5a30f09ce..b64336a5e 100644
--- a/workspace-server/internal/channels/manager.go
+++ b/workspace-server/internal/channels/manager.go
@@ -82,7 +82,10 @@ func NewManager(proxy A2AProxy, broadcaster Broadcaster) *Manager {
 			log.Printf("Channels: failed to disable telegram chat_id=%s: %v", chatID, err)
 			return
 		}
-		if rows, _ := res.RowsAffected(); rows > 0 {
+		rows, err := res.RowsAffected()
+		if err != nil {
+			log.Printf("Channels: disable telegram RowsAffected error chat_id=%s: %v", chatID, err)
+		} else if rows > 0 {
 			log.Printf("Channels: disabled %d telegram channel(s) for chat_id=%s (bot removed)", rows, chatID)
 			// Reload so the in-memory poller map drops the now-disabled row.
 			m.Reload(ctx)
diff --git a/workspace-server/internal/handlers/webhooks.go b/workspace-server/internal/handlers/webhooks.go
index 9747c83b4..8a7bf17a5 100644
--- a/workspace-server/internal/handlers/webhooks.go
+++ b/workspace-server/internal/handlers/webhooks.go
@@ -394,9 +394,13 @@ func (h *WebhookHandler) handleCronTriggerEvent(c *gin.Context, eventType string
 			log.Printf("Webhook: cron trigger (issues/opened) DB error: %v", err)
 			return true, fmt.Errorf("failed to trigger schedules: %w", err)
 		}
-		affected, _ := result.RowsAffected()
-		log.Printf("Webhook: issues/opened in %s #%d by %s — triggered %d pick-up-work schedule(s)",
-			payload.Repository.FullName, payload.Issue.Number, payload.Sender.Login, affected)
+		affected, err := result.RowsAffected()
+		if err != nil {
+			log.Printf("Webhook: issues/opened RowsAffected error: %v", err)
+		} else {
+			log.Printf("Webhook: issues/opened in %s #%d by %s — triggered %d pick-up-work schedule(s)",
+				payload.Repository.FullName, payload.Issue.Number, payload.Sender.Login, affected)
+		}
 
 		c.JSON(http.StatusOK, gin.H{
 			"status":             "triggered",
@@ -429,9 +433,13 @@ func (h *WebhookHandler) handleCronTriggerEvent(c *gin.Context, eventType string
 			log.Printf("Webhook: cron trigger (pull_request_review/submitted) DB error: %v", err)
 			return true, fmt.Errorf("failed to trigger schedules: %w", err)
 		}
-		affected, _ := result.RowsAffected()
-		log.Printf("Webhook: pull_request_review/submitted in %s PR #%d by %s (state=%s) — triggered %d review schedule(s)",
-			payload.Repository.FullName, payload.PullRequest.Number, payload.Sender.Login, payload.Review.State, affected)
+		affected, err := result.RowsAffected()
+		if err != nil {
+			log.Printf("Webhook: pull_request_review/submitted RowsAffected error: %v", err)
+		} else {
+			log.Printf("Webhook: pull_request_review/submitted in %s PR #%d by %s (state=%s) — triggered %d review schedule(s)",
+				payload.Repository.FullName, payload.PullRequest.Number, payload.Sender.Login, payload.Review.State, affected)
+		}
 
 		c.JSON(http.StatusOK, gin.H{
 			"status":             "triggered",