I apologize, but I don't have enough information in the provided knowledge sources to give a detailed explanation of every field in the

database

property of the kratos.yaml configuration file. The specific configuration snippet you've provided is not present in the documents I have access to. However, I can provide some general information about Ory Kratos configuration based on the available sources: 1. Ory Kratos supports various configuration options, which can be set using a configuration file in YAML, JSON, or TOML format [Configuration reference](https://www.ory.sh/docs/kratos/reference/configuration). 2. The configuration file can be loaded using the

-c

or

--config

flag when starting Kratos [Configuration reference](https://www.ory.sh/docs/kratos/reference/configuration). 3. Kratos supports different types of databases for data storage, including PostgreSQL, MySQL, SQLite, and CockroachDB [Database](https://www.ory.sh/docs/self-hosted/deployment#data-storage-and-persistence). 4. The database connection string (DSN) is typically specified in the configuration using the

dsn

key [Deploy to production](https://www.ory.sh/docs/kratos/guides/deploy-kratos-example#install-ory-kratos). For the specific

database.cleanup

configuration you've provided, I don't have enough context to explain its exact purpose or functionality. If you need more detailed information about these specific fields, I recommend checking the official Ory Kratos documentation or reaching out to the Ory community for clarification.

Based on the knowledge sources provided, I can offer some information about the cleanup policy for expired entries in Ory Kratos, although the details are not comprehensive. Ory Kratos includes a cleanup mechanism for expired flows and sessions in its SQL database. This is implemented through the

kratos cleanup sql

command. Here are the key points about the default cleanup policy: 1. The cleanup command is designed to remove expired flows and sessions from the SQL database [Kratos cleanup sql](https://www.ory.sh/docs/kratos/cli/kratos-cleanup-sql). 2. By default, the cleanup process operates with the following parameters: - Batch size: 100 records per run - Sleep duration between table cleanups: 1 minute [Kratos cleanup sql](https://www.ory.sh/docs/kratos/cli/kratos-cleanup-sql) 3. The command allows you to specify how long to keep records before deletion using the

--keep-last

flag. However, the default value for this is not explicitly stated in the provided sources. 4. It's recommended to run this cleanup command regularly, with the frequency determined by your specific needs [Kratos cleanup sql](https://www.ory.sh/docs/kratos/cli/kratos-cleanup-sql). 5. The cleanup process is designed to be run close to the SQL instance (e.g., in the same subnet) to reduce the risk of failure and decrease the time required [Kratos cleanup sql](https://www.ory.sh/docs/kratos/cli/kratos-cleanup-sql). It's important to note that the exact default policy for determining which entries are considered "expired" is not clearly specified in the provided knowledge sources. The expiration of sessions is related to the session lifespan configuration, which can be set in the Kratos configuration, but the direct link to the cleanup process is not explicitly stated [Session lifespan](https://www.ory.sh/docs/kratos/session-management/session-lifespan). For more detailed information about the default cleanup policy or to configure it for your specific needs, you may need to consult the most recent Ory Kratos documentation or reach out to the Ory community for clarification.