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docs: update DB maintenance for v0.8.x
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@ -7,7 +7,7 @@ intervention. For heavily trafficked relays, there are a number of
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steps that the operator may need to take to maintain performance and
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limit disk usage.
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This maintenance guide is current as of version `0.7.14`. Future
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This maintenance guide is current as of version `0.8.2`. Future
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versions may incorporate and automate some of these steps.
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## Backing Up the Database
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@ -43,18 +43,15 @@ vacuum;
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## Clearing Hidden Events
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When events are deleted, either through deletion events, metadata or
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follower updates, or a replaceable event kind, the event is not
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actually removed from the database. Instead, a flag `HIDDEN` is set
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to true for the event, which excludes it from search results. The
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original intent was to ensure that subsequent rebroadcasts of the
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event would be easily detected as having been deleted, and would not
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need to be stored again. In practice, this decision causes excessive
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growth of the `tags` table, since all the previous followers are
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retained for those `HIDDEN` events.
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When events are deleted, the event is not actually removed from the
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database. Instead, a flag `HIDDEN` is set to true for the event,
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which excludes it from search results. High volume replacements from
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profile or other replaceable events are deleted, not hidden, in the
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current version of the relay.
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The `event` and especially the `tag` table can be significantly
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reduced in size by running these commands:
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In the current version, removing hidden events should not result in
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significant space savings, but it can still be used if there is no
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desire to hold on to events that can never be re-broadcast.
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```console
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PRAGMA foreign_keys = ON;
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