Server Actions are the mechanism that lets a Client Component call an async function that executes on the server. The ‘use server’ directive marks a function or module as server-executable; the bundler replaces the implementation in the client bundle with a reference, and when the client calls that reference, React sends a POST request to…
Data Vault 2.0 is not a dimensional model with different names. It is an integration architecture that separates identity, relationship, and descriptive history into three distinct table types—hubs, links, and satellites—and keys them with deterministic hash values rather than sequential surrogate keys. The separation is what makes the model resilient to source-system changes: adding a…
The choice between a star schema and a snowflake schema is a trade-off between query simplicity and storage normalization, and the trade-off is almost always decided in favor of the star schema for analytical workloads. A star schema has a single fact table surrounded by denormalized dimension tables, one per dimension. A snowflake schema normalizes…
The difference between row storage and columnar storage is a single physical decision—whether the values of a row are stored together or the values of a column are stored together—and that decision cascades into every performance characteristic of an analytical query. A row store writes each tuple contiguously, so fetching one complete record is a…
Relational databases have stored graph-shaped data since before graph databases existed. An org chart is a self-referencing table; a bill of materials is a parent-child relationship; a social network is a many-to-many table with a join table. What has changed is the query interface. For decades, the only portable way to traverse these structures was…
Temporal tables solve a problem that ordinary tables cannot: preserving every past state of a row while keeping the current state fast to query. The SQL:2011 standard introduced system-versioned temporal tables, and the major relational databases have implemented the concept with different syntax and storage models. SQL Server calls them system-versioned temporal tables and stores…
Editing SVG polygons by hand is a nightmare. You guess the coordinates. You reload the browser. The shape is still wrong. You try to add a vertex and break the whole string. I built a free tool that solves this. What it does: Use cases: Privacy:100% client-side. Nothing uploaded. Try it: tools.kandz.me/svg-polygon-editor
Tailwind CSS is a utility-first CSS framework that provides low-level utility classes for building custom designs directly in your markup, without writing custom CSS . Version 4 represents a ground-up rewrite: the new Oxide engine built in Rust delivers up to 10x faster builds, configuration moves from JavaScript to CSS with the @theme directive, and…
The Linux Foundation Certified IT Associate (LFCA) is a pre-professional certification for people entering IT or considering a career in system administration or engineering. It validates breadth across fundamental IT concepts—Linux, system administration, cloud computing, security, DevOps, and project management—rather than depth in any single area. The exam is 90 minutes, multiple-choice, and covers six…
This cheatsheet is a dense, practical reference for TypeScript’s type system, syntax, and compiler configuration. It prioritizes the features that appear most frequently in daily development—type annotations, generics, utility types, narrowing, and the tsconfig.json settings that determine how strict the compiler is. It reflects TypeScript 5.x, where satisfies, const type parameters, and decorators (standardized) are…