https://mathieu.deraedt.dev Last 15 notes on ~/.mathieu Quartz -- quartz.jzhao.xyz https://mathieu.deraedt.dev/slips/1775693193-when-the-user-does-not-inherit-irreducible-complexity-it-is-an-opinionated-system https://mathieu.deraedt.dev/slips/1775693193-when-the-user-does-not-inherit-irreducible-complexity-it-is-an-opinionated-system when engineers or products solves the irreducible complexity they need to make decisions on how to simplify and navigate this complexity. Thu, 09 Apr 2026 02:06:00 GMT https://mathieu.deraedt.dev/slips/1775692958-irreducible-complexity https://mathieu.deraedt.dev/slips/1775692958-irreducible-complexity every application or system you program will have some inherit complexity, complexity you cannot get rid of. Thu, 09 Apr 2026 02:02:00 GMT https://mathieu.deraedt.dev/slips/1775692593-monitoring-systems https://mathieu.deraedt.dev/slips/1775692593-monitoring-systems monitoring systems is not true observability. in monitoring you're thinking and trying to enumerate all known failure states. Thu, 09 Apr 2026 01:56:00 GMT https://mathieu.deraedt.dev/slips/1775692135-observability-makes-llm-dominated-codebases-more-manageable https://mathieu.deraedt.dev/slips/1775692135-observability-makes-llm-dominated-codebases-more-manageable steeping thought this is something i'm still not sure about. i'm mulling over this idea, please reach out with your perspective. Thu, 09 Apr 2026 01:48:00 GMT https://mathieu.deraedt.dev/slips/1775691431-true-observability https://mathieu.deraedt.dev/slips/1775691431-true-observability true observability is achieved when you can understand your application and application state from your collected data, no matter how bizarre, novel and unexpected. Thu, 09 Apr 2026 01:37:00 GMT https://mathieu.deraedt.dev/slips/1775602516-llms-change-constructive-friction-to-administrative-friction https://mathieu.deraedt.dev/slips/1775602516-llms-change-constructive-friction-to-administrative-friction llms are great at what they do, but they still require some help. Wed, 08 Apr 2026 00:55:00 GMT https://mathieu.deraedt.dev/slips/1775601287-llms-are-addictive https://mathieu.deraedt.dev/slips/1775601287-llms-are-addictive generative ai is addictive, there could be different reasons for this phenomenon. it simplifies and speeds up tasks massively. Wed, 08 Apr 2026 00:34:00 GMT https://mathieu.deraedt.dev/slips/1775413537-derived-data https://mathieu.deraedt.dev/slips/1775413537-derived-data derived data is a copy of data from a source of truth, for data keeping or storing it's redundant, yet it can have many purposes. Sun, 05 Apr 2026 20:25:00 GMT https://mathieu.deraedt.dev/slips/1775413471-source-of-truth https://mathieu.deraedt.dev/slips/1775413471-source-of-truth a source of truth (also known as a system of records) is just a dataset that has the ultimate authoritative say over data-correctness. Sun, 05 Apr 2026 20:24:00 GMT https://mathieu.deraedt.dev/slips/1775403934-data-lakes-are-data-warehouses-with-unstructured-data https://mathieu.deraedt.dev/slips/1775403934-data-lakes-are-data-warehouses-with-unstructured-data data lakes are analytical data systems just as a data warehouse. Sun, 05 Apr 2026 17:45:00 GMT https://mathieu.deraedt.dev/slips/1775403244-htap-combines-oltp-and-olap https://mathieu.deraedt.dev/slips/1775403244-htap-combines-oltp-and-olap hybrid transactional/analytical processing is a combined oltp and olap system in one. often they are two separate systems bundled together. Sun, 05 Apr 2026 17:34:00 GMT https://mathieu.deraedt.dev/slips/1775402757-extract-transform-load https://mathieu.deraedt.dev/slips/1775402757-extract-transform-load this 'process' is often used in olap or analytical data system. Sun, 05 Apr 2026 17:25:00 GMT https://mathieu.deraedt.dev/slips/1775402492-data-warehouses https://mathieu.deraedt.dev/slips/1775402492-data-warehouses a data warehouse is a system that combines multiple operational data system (usually oltp systems) together into one big database. Sun, 05 Apr 2026 17:21:00 GMT https://mathieu.deraedt.dev/slips/1775401902-analytical-data-system https://mathieu.deraedt.dev/slips/1775401902-analytical-data-system this data system is set up to create novel insights and analyze the data that you have, often in a data access pattern like olap, where aggregations are key. Sun, 05 Apr 2026 17:11:00 GMT https://mathieu.deraedt.dev/slips/1775401781-operational-data-system https://mathieu.deraedt.dev/slips/1775401781-operational-data-system an operational data system is one where you actively read and write records depending on the operations that are undertaken. Sun, 05 Apr 2026 17:09:00 GMT