refactor DB health-check

src/ez_lan_manager/pages/BasePage.py

@@ -4,12 +4,18 @@ from typing import *  # type: ignore
 
 from rio import Component, event, Spacer, Card, Container, Column, Row, TextStyle, Color, Text
 
-from src.ez_lan_manager import ConfigurationService
+from src.ez_lan_manager import ConfigurationService, DatabaseService
 from src.ez_lan_manager.components.DesktopNavigation import DesktopNavigation
 
 class BasePage(Component):
     content: Component
 
+    @event.periodic(5)
+    async def check_db_conn(self) -> None:
+        is_healthy = await self.session[DatabaseService].is_healthy()
+        if not is_healthy:
+            self.session.navigate_to("./db-error")
+
     @event.on_window_size_change
     async def on_window_size_change(self):
         await self.force_refresh()