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	Add note about synapse-janitor and require explicit confirmation for usage
Fixes #465 (Github Issue). Related to https://github.com/xwiki-labs/synapse_scripts/pull/12.
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		@@ -8,11 +8,17 @@ Table of contents:
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- [Purging old data with the Purge History API](#purging-old-data-with-the-purge-history-api), for when you wish to delete in-use (but old) data from the Synapse database
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- [Compressing state with rust-synapse-compress-state](#compressing-state-with-rust-synapse-compress-state), for when you wish to compress some Synapse state tables using the [rust-synapse-compress-state](https://github.com/matrix-org/rust-synapse-compress-state) tool
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- [Synapse maintenance](#synapse-maintenance)
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	- [Purging unused data with synapse-janitor](#purging-unused-data-with-synapse-janitor)
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		- [Vacuuming Postgres](#vacuuming-postgres)
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	- [Purging old data with the Purge History API](#purging-old-data-with-the-purge-history-api)
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	- [Compressing state with rust-synapse-compress-state](#compressing-state-with-rust-synapse-compress-state)
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## Purging unused data with synapse-janitor
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**NOTE**: There are [reports](https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/465) that **synapse-janitor is dangerous to use and causes database corruption**. You may wish to refrain from using it.
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When you **leave** and **forget** a room, Synapse can clean up its data, but currently doesn't.
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This **unused and unreachable data** remains in your database forever.
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@@ -7,6 +7,13 @@
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    msg: "Postgres via the matrix-postgres role is not enabled (`matrix_postgres_enabled`). Cannot run synapse-janitor."
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  when: "not matrix_postgres_enabled|bool"
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- name: Fail if not aware of the risks
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  fail:
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    msg: >-
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      Using Synapse Janitor is considered dangerous and may break your database.
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      See https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/465.
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      If you'd like to run it anyway, add `--extra-vars='i_know_synapse_janitor_is_dangerous=1'` to your command.
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  when: "i_know_synapse_janitor_is_dangerous|default('') == ''"
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# Defaults
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