Terminate watcher if database changes

src/include/watcher.hpp

@@ -26,6 +26,7 @@ private:
   std::condition_variable cv;
   std::atomic<bool> should_run;
   HttpServer &server;
+  DatabaseInstance *watched_database;
 };
 } // namespace ui
 } // namespace duckdb

src/watcher.cpp

@@ -62,6 +62,12 @@ void Watcher::Watch() {
       break; // DB went away, nothing to watch
     }
 
+	if (watched_database == nullptr) {
+	  watched_database = db.get();
+	} else if (watched_database != db.get()) {
+	  break; // DB changed, stop watching, will be restarted
+	}
+
     duckdb::Connection con{*db};
     auto polling_interval = GetPollingInterval(*con.context);
     if (polling_interval == 0) {