Check at HTTP layer for DELETE mode

http/service.go

@@ -764,6 +764,11 @@ func (s *Service) handleBoot(w http.ResponseWriter, r *http.Request, qp QueryPar
 		http.Error(w, "invalid SQLite data", http.StatusBadRequest)
 		return
 	}
+	if !db.IsDELETEModeEnabled(peek) {
+		http.Error(w, "SQLite database file is in WAL mode - convert it to DELETE mode via 'PRAGMA journal_mode=DELETE'",
+			http.StatusBadRequest)
+		return
+	}
 
 	s.logger.Printf("starting boot process")
 	_, err = s.store.ReadFrom(bufReader)