--- title: Medium | daily.dev description: The Lock-First pattern solves the problem of auto-fill systems silently overwriting user-entered data. By adding explicit boolean lock flags (e.g.,... canonical: https://daily.dev/posts/medium-w0clgsxfx twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Medium | daily.dev og:description: The Lock-First pattern solves the problem of auto-fill systems silently overwriting user-entered data. By adding explicit boolean lock flags (e.g.,... og:url: https://daily.dev/posts/medium-w0clgsxfx og:image: https://api.daily.dev/og/posts/W0cLgsxFX.png og:image:alt: Medium og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Medium **[Medium](https://daily.dev/sources/medium_js)** · 4 min read · 0 upvotes · 0 comments ## Summary The Lock-First pattern solves the problem of auto-fill systems silently overwriting user-entered data. By adding explicit boolean lock flags (e.g., `is_end_date_locked`) to data models, developers can clearly define whether the system or the user owns a given field. The pattern involves three steps: adding lock flags to the database schema, checking lock state before applying auto-calculations in business logic, and surfacing the lock state visually in the UI with a toggle. This approach eliminates silent data loss, enables audit trails via source tracking, and supports both automated defaults and manual overrides in the same workflow. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Stop Choosing Between Local and Cloud LLMs: A Field Guide to Hybrid Patterns](https://daily.dev/posts/stop-choosing-between-local-and-cloud-llms-a-field-guide-to-hybrid-patterns-fmxjagvkq) · Towards Data Science · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/medium-w0clgsxfx) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Medium","url":"https://daily.dev/posts/medium-w0clgsxfx","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/medium-w0clgsxfx"},"datePublished":"2026-07-13T19:29:02.066Z","dateModified":"2026-07-13T19:29:24.848Z","description":"The Lock-First pattern solves the problem of auto-fill systems silently overwriting user-entered data. By adding explicit boolean lock flags (e.g.,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/b52bcceebdbc899cc43d077f15394cb3?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/b52bcceebdbc899cc43d077f15394cb3?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/medium-w0clgsxfx","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Medium"}]} ```