Most ‘caching’ bugs are really invalidation bugs, so I stick to a simple cache-aside pattern with conservative TTLs and treat cache misses as normal. The big failure mode to avoid is a stampede: if many requests miss at once, you can crush your DB. Fo

When multiple clients can update the same record, I prefer optimistic locking over heavy row locks. The idea is simple: every row has a version that increments on each update. The update statement includes WHERE id=$1 AND version=$2, so if someone els

CTEs improve query readability and maintainability. WITH clauses define named subqueries referenced in main query. I use CTEs to break complex queries into logical steps. Recursive CTEs handle hierarchical data—org charts, category trees, graph traver

Backfills often fail because we accidentally load full records and associations. Use select to fetch only needed columns and find_each to keep memory flat. This is basic, but it’s where outages come from.

Heavy work inside a transaction increases lock time and deadlock risk. Use after_save_commit to schedule slow tasks (thumb generation, external sync) once the write is durable.

Combining React Hook Form with Zod provides type-safe form validation with a schema-first approach. Zod schemas define the shape and rules for form data, and the zodResolver bridges them to React Hook Form. TypeScript infers form types from schemas au

Artisan commands automate repetitive tasks via the command line. I create command classes with php artisan make:command defining signatures and descriptions. The handle() method contains command logic. Arguments and options capture user input with typ

Background jobs will fail in production, so I like having a predictable story for retries and poison messages. BullMQ is a solid middle ground: Redis-backed, straightforward, and good enough for most apps. I set explicit attempts and backoff, and when

ETags are a simple high-impact performance lever: they reduce bandwidth and controller CPU. Use stale? with a stable ETag component list and last_modified so intermediary caches and browsers can do conditional GET.

Even without extra gems, you can validate incoming JSON payloads with small “contracts” that coerce and validate keys. It’s a strong reliability upgrade for webhook and API ingestion.

CSS custom properties define reusable values with --variable-name syntax and access with var(--variable-name). I scope variables at :root for global access or within selectors for local scope. Variables cascade and inherit unlike preprocessor variable

Optimistic updates make UIs feel instant by immediately showing the expected result before the server confirms. When a user likes a post, I update the local cache immediately, submit the request in background, and rollback if it fails. React Query's m