externalized query specifications

src/Dependencies.py

 import secrets
 
-from fastapi import Security, HTTPException
+from fastapi import Security, HTTPException, Query
 from fastapi.security import APIKeyHeader
 from starlette.status import HTTP_403_FORBIDDEN
 
@@ -23,3 +23,9 @@ async def check_api_key(apiKey: str = Security(API_KEY_HEADER)):
     expectedApiKey = SETTINGS['api']['key']
     if not secrets.compare_digest(expectedApiKey, apiKey):
         raise HTTPException(status_code=HTTP_403_FORBIDDEN, detail='apiKey invalid')
+
+
+START_DATE_TIME: str = Query('2021-01-16 18:15:22',
+                             description='The start date and time of the date range that should be taken into account.')
+END_DATE_TIME: str = Query('2021-01-16 19:15:22',
+                           description='The end date and time of the date range that should be taken into account.')

src/routers/MeasurementRouter.py

 from typing import List
 
-from fastapi import APIRouter, HTTPException, Depends, Query
+from fastapi import APIRouter, HTTPException, Depends
 from sqlalchemy.orm import Session
 
-from Dependencies import get_database, check_api_key
+from Dependencies import get_database, check_api_key, START_DATE_TIME, END_DATE_TIME
 from logic.databaseNew import Schemas, Crud
 from logic.databaseNew.Schemas import Status
 
@@ -14,13 +14,10 @@ router = APIRouter(
 
 
 @router.get('/', response_model=List[Schemas.Measurement],
-            summary='Gets all measurements (Number of results can be limited by specifying a date range).')
-async def read_measurements(startDateTime: str = Query('2020-01-20 18:15:22',
-                                                       description='The start date and time of the date range '
-                                                                   'that should be taken into account.'),
-                            endDateTime: str = Query('2020-01-20 19:15:22',
-                                                     description='The end date and time of the date range '
-                                                                 'that should be taken into account.'),
+            summary='Gets all measurements',
+            description='Number of results can be limited by specifying a date range')
+async def read_measurements(startDateTime: str = START_DATE_TIME,
+                            endDateTime: str = END_DATE_TIME,
                             db: Session = Depends(get_database)):
     return Crud.get_measurements(db, startDateTime=startDateTime, endDateTime=endDateTime)