healthcheck extension (#121)

* Updates submodule

* Extends healthcheck with database logic

* Adds healthcheck for database

* Adds databasehealthcheck

* Updates submodule

* Cleans up database healthcheck endpoint

* Updates submodule

* Combines checks into one endpoint

Author: SimonDegrafKern

api/healthcheck.py

@@ -1,7 +1,12 @@
 from starlette.endpoints import HTTPEndpoint
 from starlette.responses import PlainTextResponse
+from submodules.model.business_objects import general
 
 
 class Healthcheck(HTTPEndpoint):
     def get(self, request) -> PlainTextResponse:
-        return PlainTextResponse("OK")
+        headers = {"APP": "OK"}
+        database_test = general.test_database_connection()
+        if not database_test.get("success"):
+            headers["DATABASE"] = database_test.get("error")
+        return PlainTextResponse("OK", headers=headers)