replace pymysql with mysqlclient as it is "better"; also fix an issue in the ui exporter that had wrong imports

crawler/api/app.py

@@ -18,6 +18,15 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from tasks import listing_tasks
 from ui_exporter import export_immoweb
+from alembic import command
+from alembic.config import Config
+from contextlib import asynccontextmanager
+from celery.exceptions import TaskRevokedError
+from celery_app import app as celery_app
+from opentelemetry.instrumentation.fastapi import FastAPIInstrumentor
+from api.metrics import metrics_app  # Import the Prometheus ASGI app
+from opentelemetry.metrics import get_meter
+
 
 load_dotenv()
 logger = logging.getLogger("uvicorn")
@@ -35,6 +44,16 @@ logger = logging.getLogger("uvicorn")
 
 # app = FastAPI(lifespan=lifespan)
 app = FastAPI()
+app.mount("/metrics", metrics_app)
+meter = get_meter(__name__)
+request_counter = meter.create_counter(
+    name="custom_request_count",
+    description="Number of times /hello was called",
+)
+hist = meter.create_histogram(
+    name="custom_request_duration",
+    description="Duration of /hello requests in seconds",
+)
 
 
 # Allow CORS (for React frontend)
@@ -48,6 +67,8 @@ app.add_middleware(
 
 @app.get("/api/status")
 async def get_status():
+    request_counter.add(1, {"method": "GET", "path": "/status"})
+    hist.record(1.5, {"method": "GET", "path": "/status"})
     return {"status": "OK"}
 
 
@@ -125,3 +146,6 @@ async def get_districts(
     user: Annotated[User, Depends(get_current_user)],
 ) -> dict[str, str]:
     return districts.get_districts()
+
+
+FastAPIInstrumentor.instrument_app(app)