--- title: It Passed Every Test and Still Broke: Four Signals... description: Passing all validation rules doesn't guarantee a data pipeline is healthy. Four behavioral signals that row-level checks miss are: freshness (did data arrive... canonical: https://daily.dev/posts/it-passed-every-test-and-still-broke-four-signals-validation-never-catches-pzcsecpac twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: It Passed Every Test and Still Broke: Four Signals Validation Never Catches | daily.dev og:description: Passing all validation rules doesn't guarantee a data pipeline is healthy. Four behavioral signals that row-level checks miss are: freshness (did data arrive... og:url: https://daily.dev/posts/it-passed-every-test-and-still-broke-four-signals-validation-never-catches-pzcsecpac og:image: https://api.daily.dev/og/posts/PZcseCPAC.png og:image:alt: It Passed Every Test and Still Broke: Four Signals Validation Never Catches 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. # It Passed Every Test and Still Broke: Four Signals Validation Never Catches **[SQL Authority](https://daily.dev/sources/sql-authority)** · 5 min read · 0 upvotes · 0 comments ## Summary Passing all validation rules doesn't guarantee a data pipeline is healthy. Four behavioral signals that row-level checks miss are: freshness (did data arrive on time?), volume (is the row count within normal range?), schema drift (did upstream column definitions change?), and distribution shift (did the mix of values change unexpectedly?). Catching these requires establishing a baseline of normal behavior over time and alerting on significant deviations rather than every small change. A simple SQL freshness check is demonstrated as a starting point. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Your Service Is Healthy, but Its Data Isn’t: Rethinking Cloud-Native Health Checks](https://daily.dev/posts/your-service-is-healthy-but-its-data-isn-t-rethinking-cloud-native-health-checks-qgojwba9o) · Cloud Native Now · 0 upvotes · 0 comments - [Why data quality matters when working with data at scale](https://daily.dev/posts/why-data-quality-matters-when-working-with-data-at-scale-quxnp688w) · The Next Web · 0 upvotes · 0 comments - [Migration Series — Lesson 5: The Final Gate: Proving Trust with Rigorous, Automated Validation](https://daily.dev/posts/migration-series-lesson-5-the-final-gate-proving-trust-with-rigorous-automated-validation-tmofuir4s) · Snowflake Community · 0 upvotes · 0 comments - [The Industry Is Solving Flaky Tests Backwards](https://daily.dev/posts/the-industry-is-solving-flaky-tests-backwards-gsp5zpcqq) · SD Times · 0 upvotes · 0 comments - [Grab Adds Real-Time Data Quality Monitoring to Its Platform](https://daily.dev/posts/grab-adds-real-time-data-quality-monitoring-to-its-platform-8kkpu4hkw) · InfoQ · 0 upvotes · 0 comments --- Tags: [#backend](https://daily.dev/tags/backend), [#sql](https://daily.dev/tags/sql), [#monitoring](https://daily.dev/tags/monitoring), [#data-quality](https://daily.dev/tags/data-quality), [#data-observability](https://daily.dev/tags/data-observability) [View this post on daily.dev](https://daily.dev/posts/it-passed-every-test-and-still-broke-four-signals-validation-never-catches-pzcsecpac) ```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":"It Passed Every Test and Still Broke: Four Signals Validation Never Catches","url":"https://daily.dev/posts/it-passed-every-test-and-still-broke-four-signals-validation-never-catches-pzcsecpac","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/it-passed-every-test-and-still-broke-four-signals-validation-never-catches-pzcsecpac"},"datePublished":"2026-07-16T01:36:11.340Z","dateModified":"2026-07-16T01:36:32.975Z","description":"Passing all validation rules doesn't guarantee a data pipeline is healthy. 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