chore: Add test_read method to Database class for testing read access to the database and use it with the web UI

src/common/db/Database.py

@@ -215,6 +215,12 @@ class Database:
         if self.sql_engine:
             self.sql_engine.dispose()
 
+    def test_read(self):
+        """Test the read access to the database"""
+        self.logger.debug("Testing read access to the database ...")
+        with self.__db_session() as session:
+            session.execute(text("SELECT 1"))
+
     def test_write(self):
         """Test the write access to the database"""
         self.logger.debug("Testing write access to the database ...")

src/ui/main.py

@@ -475,6 +475,11 @@ def before_request():
             except BaseException:
                 ui_data["READONLY_MODE"] = True
                 ui_data["LAST_DATABASE_RETRY"] = app.config["DB"].last_connection_retry.isoformat()
+        else:
+            try:
+                app.config["DB"].test_read()
+            except BaseException:
+                ui_data["LAST_DATABASE_RETRY"] = app.config["DB"].last_connection_retry.isoformat()
 
         app.config["DB"].readonly = ui_data.get("READONLY_MODE", False)
         with LOCK: