A serverless pixel service API backed by NoSQL (Firestore).
GET: https://us-central1-narrative-292719.cloudfunctions.net/analytics?timestamp=1
POST: "https://us-central1-narrative-292719.cloudfunctions.net/analytics?timestamp=1&user=user&event=click"
gcloud functions deploy $endpoint --entry-point=pixel.PixelService --runtime=java11 --trigger-http --source=$jar
--set-env-vars PROJECT_ID=$project_id,DATASET=&firestore_collection