Power BI Performance Issues Often Stem From Poor Data Modelling, Not DAX

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Most Power BI problems — including incorrect totals, unresponsive slicers, and slow reports — are typically rooted in flawed data models rather than faulty DAX calculations. Data modelling in Power BI involves organizing tables and defining relationships between them to enable accurate and efficient analysis. Three common modelling approaches exist: flat tables, which store all data in one place and suit small datasets; star schemas, which connect a central fact table to surrounding dimension tables; and additional structures suited for more complex needs. A well-designed model improves reporting accuracy, dashboard performance, and the reliability of calculated metrics. It also makes reports easier to maintain and scale as data volumes grow over time.

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DIY AI plush toy runs fully offline using Raspberry Pi and a local LLM

A developer has built an open-source AI-powered plush toy capable of holding philosophical conversations entirely on a local network without any internet connection. The toy uses a Raspberry Pi Zero WH paired with a USB microphone, camera, speaker, and a servo motor to move its head, with all processing handled by a connected computer running a local AI inference server. It can recognize multiple faces, detect emotions, remember past conversations, and respond with customizable personalities in English or Spanish. The full hardware build costs approximately €110, excluding the computer and inference server, and the project recommends at least an 8-billion-parameter language model. The source code is publicly available on GitHub under an MIT license, and the creator states the project is non-profit and collects no user data.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Why Software Needs State Machines: Lessons from an Order Fulfillment Model

A software design tutorial on DEV Community explores why applications must track not just data but system state to behave correctly. Using an e-commerce order fulfillment example, the author demonstrates that a single command like ship_order can require different actions depending on what has previously occurred. A naive implementation using a plain status string field can allow invalid transitions, such as shipping an unpaid order, because the field stores data without enforcing business rules. The tutorial distinguishes between ordinary data fields and a special 'state' field whose value actively governs what the system is allowed to do next. This distinction sets the conceptual foundation for introducing state machines as a principled solution to the problem.

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ProgrammingDEV Community ·

How to Add Self-Service Ad Hoc Reporting to ASP.NET Core Apps

Developer Razi Syed has published a guide on embedding self-service ad hoc reporting into ASP.NET Core applications using the Dotnet Report NuGet package. The approach allows non-developers to build their own reports by selecting tables, columns, filters, and charts through a guided interface, eliminating the need for developers to write each report manually. Integration involves installing the package, configuring API tokens and a database connection string in appsettings.json, and registering the required MVC, session, and HttpClient services. Once the schema is exposed, users can independently create, export, schedule, and visualize reports without writing any SQL. The method is compatible with .NET 6 and above, with separate packages available for legacy .NET Framework MVC and Web Forms projects.

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