backwards bool in main

main.go

@@ -11,6 +11,14 @@ import (
 func main() {
 	ctx, can := signal.NotifyContext(context.Background(), syscall.SIGINT)
 	defer can()
+
+	defer func() {
+		if err := recover(); err != nil {
+			log.Println("panic:", err)
+			panic(err)
+		}
+	}()
+
 	if err := src.Main(ctx); err != nil && ctx.Err() == nil {
 		panic(err)
 	}

src/main.go

@@ -17,9 +17,9 @@ func Main(ctx context.Context) error {
 	defer reader.Close()
 
 	interval := time.Millisecond * 50
-	if intervalS := os.Getenv("MAIN_INTERVAL_DURATION"); intervalS != "" {
+	if intervalS := os.Getenv("MAIN_INTERVAL_DURATION"); intervalS == "" {
 	} else if v, err := time.ParseDuration(intervalS); err != nil {
-		panic(err)
+		return err
 	} else {
 		interval = v
 	}