Migrations evolve database schema safely across environments. I follow strict conventions: one logical change per migration, descriptive names, reversible operations. Using change instead of up/down enables automatic rollback for most operations. For

Proxy models create different Python behavior for the same database table. I set proxy = True in Meta. This adds methods or changes default ordering without new tables. Proxy models share the same table as the original. Use cases include different man

CORS configs have a habit of getting more permissive over time until you’re basically allowing any origin. I keep an explicit allowlist and handle credentials carefully. If you allow cookies, you can’t use * as the origin. I also keep preflight respon

Not every integration payload maps cleanly to a static struct. When I need to accept “mostly known” JSON but preserve unknown fields for auditing or forward compatibility, I use json.RawMessage. That allows me to decode the envelope (event name, versi

Turbo gives you a handful of built-in stream actions (append, replace, remove), but sometimes you want behavior like “replace then highlight”. You can implement this as a custom action: send a turbo-stream with action='highlight' and include a templat

Axum is a modern web framework built on tokio and hyper. It uses extractors (like Json<T>, Path<T>, State<S>) to parse requests into Rust types, and the compiler ensures your handlers match their routes. Middleware is just functions,

As applications grow, read operations often dominate database load. Directing reads to replica databases while keeping writes on the primary reduces contention and improves response times. Rails makes this straightforward with connects_to and role-bas

Flexbox provides one-dimensional layout for rows or columns. I use display: flex on containers to enable flexbox. The flex-direction property controls main axis direction (row, column, row-reverse, column-reverse). The justify-content property aligns

Counters are classic race-condition bait. If two requests read, increment, and write, you’ll lose updates under load. I prefer letting Postgres do the atomic work with an upsert: INSERT ... ON CONFLICT ... DO UPDATE to increment the existing value. Th

A per-request statement_timeout is a great “seatbelt” for endpoints that can run bad queries when parameters are unexpected. You can set it for a block; Postgres enforces the wall clock limit.

CSS transitions animate property changes with transition: property duration timing-function delay. I use transition-property to specify which properties animate. The timing-function controls acceleration with values like ease, ease-in, ease-out, cubic

UserDefaults provides simple key-value storage for app preferences and settings. It persists basic types like strings, numbers, bools, dates, and data automatically. I use UserDefaults for user preferences, app state, and feature flags—never for sensi