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docs: update DB maintenance for v0.8.x

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Greg Heartsfield 2023-02-06 07:07:23 -06:00
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docs/database-maintenance.md
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@ -7,7 +7,7 @@ intervention. For heavily trafficked relays, there are a number of
steps that the operator may need to take to maintain performance and
limit disk usage.
This maintenance guide is current as of version `0.7.14`. Future
This maintenance guide is current as of version `0.8.2`. Future
versions may incorporate and automate some of these steps.
## Backing Up the Database
@ -43,18 +43,15 @@ vacuum;
## Clearing Hidden Events
When events are deleted, either through deletion events, metadata or
follower updates, or a replaceable event kind, the event is not
actually removed from the database. Instead, a flag `HIDDEN` is set
to true for the event, which excludes it from search results. The
original intent was to ensure that subsequent rebroadcasts of the
event would be easily detected as having been deleted, and would not
need to be stored again. In practice, this decision causes excessive
growth of the `tags` table, since all the previous followers are
retained for those `HIDDEN` events.
When events are deleted, the event is not actually removed from the
database. Instead, a flag `HIDDEN` is set to true for the event,
which excludes it from search results. High volume replacements from
profile or other replaceable events are deleted, not hidden, in the
current version of the relay.
The `event` and especially the `tag` table can be significantly
reduced in size by running these commands:
In the current version, removing hidden events should not result in
significant space savings, but it can still be used if there is no
desire to hold on to events that can never be re-broadcast.
```console
PRAGMA foreign_keys = ON;