Articles by Jonathas Costa on software engineering, SQL, tooling and more.https://www.jonathas.net/enhttps://www.jonathas.net/dotnet-8-to-dotnet-10.htmlhttps://www.jonathas.net/dotnet-8-to-dotnet-10.html.NET 8 and .NET 9 both reach end of support on November 10, 2026. Here's a practical checklist for moving a service straight to .NET 10, the next LTS release, and the C# 14 features worth adopting on the way.Tue, 29 Sep 2026 00:00:00 GMT.NETC#Upgradeshttps://www.jonathas.net/sudoku-generator-typescript.htmlhttps://www.jonathas.net/sudoku-generator-typescript.htmlEvery puzzle in my Sudoku is generated in the browser, with exactly one solution, in a few milliseconds. Here's how: bit masks for candidates, a most-constrained-first solver, symmetric clue removal and a simple difficulty grader.Tue, 29 Sep 2026 00:00:00 GMTTypeScriptAlgorithmsSudokuhttps://www.jonathas.net/dotnet-lambda-cold-starts.htmlhttps://www.jonathas.net/dotnet-lambda-cold-starts.htmlCold starts are the price of running .NET on Lambda. Here's how to measure them, the cheap fixes to try first, and how SnapStart and Native AOT compare on the .NET 10 runtime.Mon, 03 Aug 2026 00:00:00 GMT.NETAWS LambdaServerlessPerformancehttps://www.jonathas.net/opentelemetry-aspnet-core-grafana.htmlhttps://www.jonathas.net/opentelemetry-aspnet-core-grafana.htmlTraces, metrics and logs from an ASP.NET Core API into Grafana, with one Docker container and a few lines of setup. Then the dashboards and queries that answer the questions you'll actually have in production.Wed, 08 Apr 2026 00:00:00 GMT.NETASP.NET CoreOpenTelemetryGrafanaObservabilityhttps://www.jonathas.net/sql-server-2025-regular-expressions.htmlhttps://www.jonathas.net/sql-server-2025-regular-expressions.htmlSQL Server 2025 adds seven REGEXP functions to T-SQL. Here's how to use them to validate, clean, extract and split text, and what to watch for with indexes, collations and compatibility levels.Tue, 03 Mar 2026 00:00:00 GMTSQLSQL ServerDatabaseshttps://www.jonathas.net/sql-ctes.htmlhttps://www.jonathas.net/sql-ctes.htmlIn the vast world of SQL, the WITH clause, or Common Table Expressions (CTEs), stands out as an underutilized treasure: a sleek way to structure complex queries, enhancing readability and maintainability.Wed, 10 Apr 2024 00:00:00 GMTSQLDatabaseshttps://www.jonathas.net/mermaid-diagrams-chatgpt.htmlhttps://www.jonathas.net/mermaid-diagrams-chatgpt.htmlDiagrams are essential tools for visualizing processes, workflows, and data structures. Here's how to create them in seconds with Mermaid's text-based syntax, right inside ChatGPT.Tue, 26 Mar 2024 00:00:00 GMTMermaidChatGPTDiagrams