Seidor Opentrends, based in Barcelona, specializes in IT transformation services and open-source solutions for smart cities, with Sentilo as a key product for sensor and actuator management. Originally developed with the Barcelona City Council, Sentilo is now a robust platform supported by a global community, handling millions of messages daily. To enhance Sentilo's capabilities, Seidor Opentrends integrated Grafana and TimescaleDB, providing customizable visualizations and long-term data storage. This combination allows for efficient real-time data handling and historical analysis, with Grafana offering rich, interactive dashboards embedded in public websites for sectors like noise monitoring and air quality. This setup, used by entities like Barcelona Smart Region and Eivissa, facilitates data exploration and dashboard creation, emphasizing the importance of query optimization for cost-effective, high-performance results. Users have the flexibility to download Sentilo for free, opt for a SaaS version, or request custom solutions.