Re-instate the scheduler for the demo instances (#279)

* For the demo instance, re-instate the scheduler, but infrequently for api updates

- In constants, determine the cadence based on whether it's a demo instance or not
- This allow us to collect telemetry again. This will also allow us to save the chat session

* Conditionally skip updating the index altogether if it's a demo isntance

src/khoj/configure.py

@@ -67,8 +67,10 @@ def configure_routes(app):
     app.include_router(web_client)
 
 
-@schedule.repeat(schedule.every(61).minutes)
-def update_search_index():
+if not state.demo:
+
+    @schedule.repeat(schedule.every(61).minutes)
+    def update_search_index():
         state.search_index_lock.acquire()
         state.model = configure_search(state.model, state.config, regenerate=False)
         state.search_index_lock.release()

src/khoj/main.py

@@ -65,7 +65,6 @@ def run():
     logger.info("🌘 Starting Khoj")
 
     if not args.gui:
-        if not state.demo:
         # Setup task scheduler
         poll_task_scheduler()
 

src/khoj/routers/api.py

@@ -41,6 +41,7 @@ from fastapi.responses import StreamingResponse
 api = APIRouter()
 logger = logging.getLogger(__name__)
 
+# If it's a demo instance, prevent updating any of the configuration.
 if not state.demo:
 
     @api.get("/config/data", response_model=FullConfig)