[EuroPython 2023 — South Hall 2A on 2023-07-19] https://ep2023.europython.eu/session/adding-zero-downtime-migrations-strategy-in-a-saas-project Zero-downtime migration is a technique for running database migrations without stopping the web app. As clients' databases grow larger, applying necessary updates to the database can become time-consuming or potentially break the database schema. This talk will describe problematic operation types and provide a strategy for writing and running migrations to release new software versions without downtime. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License http://creativecommons.org/licenses/by-nc-sa/4.0/