add test db endpoint, fix startup error

server/api/routes/ping.py

 from fastapi import APIRouter
 from fastapi.responses import PlainTextResponse
 
+from sqlalchemy import select, func as F
+from nacsos_data.db.schemas.projects import Project
+
 from server.pipelines import tasks
 from server.util.logging import get_logger
 from server.util.security import InsufficientPermissions
+from server.data import db_engine
 
 logger = get_logger('nacsos.api.route.ping')
 router = APIRouter()
@@ -57,6 +61,15 @@ async def perm():
     raise InsufficientPermissions('You do not have permission to edit this data import.')
 
 
+@router.get('/database')
+async def db_test():
+    async with db_engine.engine.connect() as session:
+        rslt = (await session.execute(select(F.count(Project.project_id)))).scalar()
+        logger.debug(f'There are {rslt:,} projects on the platform')
+        await session.close()
+        return rslt
+
+
 @router.post('/{name}', response_class=PlainTextResponse)
 async def _ping(name: str) -> str:
     return f'Hello {name}'