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Minor cleanup on recently ported doc pages (#11466)

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* move wiki pages to synapse/docs and add a few titles where necessary

* update SUMMARY.md with added pages

* add changelog

* move incorrectly located newsfragment

* update changelog number

* snake case added files and update summary.md accordingly

* update issue/pr links

* update relative links to docs

* update changelog to indicate that we moved wiki pages to the docs and state reasoning

* requested changes to admin_faq.md

* requested changes to database_maintenance_tools.md

* requested changes to understanding_synapse_through_graphana_graphs.md

* add changelog

* fix leftover merge errata

* fix unwanted changes from merge

* use two spaces between entries

* outdent code blocks
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docs/usage/administration/database_maintenance_tools.md
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@ -5,32 +5,14 @@ This blog post by Victor Berger explains how to use many of the tools listed on
## [Purge Remote Media API](../../admin_api/media_admin_api.md#purge-remote-media-api)
The purge remote media API allows server admins to purge old cached remote media.
#### Purge local media
There is no purge API for local media because you may be the only one with a copy. If you are sure you want to delete local media you could use something like the following to delete media that hasn't been accessed in a while.
```
find /path/to/synapse/media_store/local_content -atime +365 -delete
find /path/to/synapse/media_store/local_thumbnails -atime +365 -delete
```
This will delete media that hasn't been accessed in 365 days.
**Warning, check noatime flag**: You also have to double-check that the filesystem where synapse's media store don't have [noatime flag](https://unix.stackexchange.com/questions/219015/how-to-disable-access-time-settings-in-debian-linux/219017#219017). Check it with `mount`, `noatime` is something that is usually enabled by default to reduce read-write operations in the filesystem for a feature is not so demanded.
## [Purge Local Media API](../../admin_api/media_admin_api.md#delete-local-media)
This API deletes the *local* media from the disk of your own server.
## [Purge History API](../../admin_api/purge_history_api.md)
The purge history API allows server admins to purge historic events from their database, reclaiming disk space.
## [synapse_janitor.sql](https://github.com/xwiki-labs/synapse_scripts)
- this project is [unmantained and dangerous](https://github.com/xwiki-labs/synapse_scripts#unmaintained-and-dangerous)
- USE WITH CAUTION. It may cause database corruption (see https://github.com/matrix-org/synapse/issues/7305 for example).
- ["Our team hasn't used any of these scripts for some time (possibly years) (...) if anyone wants to volunteer to maintain this repo I'd be happy to transfer ownership.](https://github.com/xwiki-labs/synapse_scripts/pull/12#issuecomment-617275345)
Cleans a synapse Postgres database of deleted messages and abandoned rooms.
## [synapse-compress-state](https://github.com/matrix-org/rust-synapse-compress-state)
Tool for compressing (deduplicating) `state_groups_state` table.
## [SQL for analyzing Synapse PostgreSQL database stats](https://github.com/matrix-org/synapse/wiki/SQL-for-analyzing-Synapse-PostgreSQL-database-stats)
Some easy SQL that reports useful stat about Matrix Synapse database.
## [SQL for analyzing Synapse PostgreSQL database stats](useful_sql_for_admins.md)
Some easy SQL that reports useful stats about your Synapse database.