"Cannot destructure property 'client' of 'db.config.connection'" in Strapi

Strapi’s “Cannot destructure property ‘client’ of ‘db.config.connection’ as it is undefined” startup error indicates that no usable database configuration was loaded, rather than a database credential or network failure. The recommended first check is adding a log to the database config file to determine whether it is being loaded; if not, common causes include TypeScript builds configured with `noEmit`, missing configuration files in Docker images, environment-specific database overrides that replace the base configuration with an empty or malformed result, and processes launched from an incorrect working directory or without the required TypeScript distribution directory. If the file does load, its exported function must return Strapi’s expected nested `connection` structure and use the correct module syntax. A diagnostic process should verify the source file, generated `dist/config/database.js`, container contents, active `NODE_ENV` overrides, and process working directory, while distinguishing this build or packaging issue from separate authentication, connection refusal, and timeout errors.

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