Add graceful termination logging on signal triggers.

- Added explicit `log.I.F("exiting")` calls on signal handling for better visibility during shutdown.
- Ensured immediate return after logging to prevent further processing.

main.go

@@ -261,9 +261,13 @@ func main() {
 			fmt.Printf("\r")
 			cancel()
 			chk.E(db.Close())
+			log.I.F("exiting")
+			return
 		case <-quit:
 			cancel()
 			chk.E(db.Close())
+			log.I.F("exiting")
+			return
 		}
 	}
 	log.I.F("exiting")