Inserting thousands of records one-by-one is prohibitively slow due to the overhead of individual INSERT statements. The activerecord-import gem provides bulk insert capabilities that compile multiple records into a single multi-row INSERT, dramatical

MapKit displays interactive maps with annotations, overlays, and user location. SwiftUI's Map view simplifies basic map integration with declarative syntax. I add annotations for points of interest, polylines for routes, and polygons for regions. MKCo

JavaScript error handling uses try...catch...finally blocks to manage exceptions gracefully. I throw custom errors with throw new Error('message') for better debugging. The finally block runs regardless of success or failure. Using console.error(), co

If you’re using importmap, a clean Stimulus setup matters: it keeps controllers discoverable and avoids mystery load order bugs. I pin @hotwired/turbo-rails and @hotwired/stimulus, then use controllers index discovery to register everything. The payof

I like config that fails loudly when it’s wrong. The helpers below parse environment variables with explicit defaults and good error messages, which prevents subtle “zero value” behavior in production. This is especially important for flags like ENABL

Room provides an abstraction layer over SQLite for compile-time verified database access. I define entities with @Entity annotation, specifying table structure and relationships. DAOs (Data Access Objects) marked with @Dao contain query methods using

Time-series data tracks measurements over time—metrics, logs, sensor data. I use TimescaleDB for time-series workloads. Hypertables automatically partition by time. Continuous aggregates precompute rollups. Time-based retention policies auto-delete ol

React error boundaries catch JavaScript errors in child components, log them, and display fallback UI instead of crashing the entire app. Since error boundaries must be class components in React, I create a generic ErrorBoundary wrapper and use it aro

In Hotwire apps, I still use Rails’ RESTful routes heavily. For destructive actions from a link, data-turbo-method='delete' is the cleanest approach: you keep semantic links where appropriate and let Turbo perform the method override. I usually pair i

Structured logs are great, but at high QPS they can become their own outage: too much IO, too much storage, and noisy dashboards. zap includes a sampler that allows you to keep early logs and then sample at a fixed rate. I like this for “successful re

Sometimes you need “only one runner globally” (backfills, refresh jobs). A Redis mutex with TTL avoids deadlocks if the process dies. It’s not perfect, but it’s a solid pragmatic tool.

Replication copies data across multiple servers for redundancy and scalability. Master-slave replication has one writable primary, multiple read-only replicas. I use read replicas to scale read-heavy workloads. Master-master allows writes to multiple