fix(api): delete guilds in a background job (#3417)

fluxer_docs/src/content/docs/admin-api/guilds.mdx

@@ -405,7 +405,7 @@ Each applied group records one Admin audit entry with the target type `guild` an
 
 <RouteHeader method="DELETE" path="/v1/admin/guilds/{guild_id}" auditReason />
 
-Permanently deletes a guild and every record it owns. Requires `guild:delete`.
+Permanently deletes a guild and every record it owns. Requires `guild:delete`. The guild becomes unavailable to every member at once, and a `guildProcessDeletion` job on the `lifecycle` lane removes its records.
 
 ### Path parameters
 

fluxer_docs/src/content/docs/admin-api/jobs.mdx

@@ -126,7 +126,7 @@ The queue drops a job 7 days after it was queued. A job still recorded as `queue
 
 Use the returned `task_type` value to filter [List jobs](#list-jobs).
 
-The tasks queued by [Bulk jobs](/admin-api/bulk-jobs/) are `bulkUpdateUserFlags`, `bulkUpdateGuildFeatures`, `bulkAddGuildMembers`, and `bulkScheduleUserDeletion`. `harvestUserData` and `harvestGuildData` build [archives](/admin-api/archives/), `sendSystemDm` delivers a [system DM broadcast](/admin-api/system-dms/), and `refreshSearchIndex` rebuilds a [search index](/admin-api/search-indexes/). `removeChannelFollowers` runs on the `crosspost` lane after an announcement channel is deleted or converted into a text channel, and removes the channel follower webhooks that follow it.
+The tasks queued by [Bulk jobs](/admin-api/bulk-jobs/) are `bulkUpdateUserFlags`, `bulkUpdateGuildFeatures`, `bulkAddGuildMembers`, and `bulkScheduleUserDeletion`. `harvestUserData` and `harvestGuildData` build [archives](/admin-api/archives/), `sendSystemDm` delivers a [system DM broadcast](/admin-api/system-dms/), and `refreshSearchIndex` rebuilds a [search index](/admin-api/search-indexes/). `guildProcessDeletion` removes the records of a deleted guild after [Delete guild](/admin-api/guilds/#delete-guild) or the owner deletes it. `removeChannelFollowers` runs on the `crosspost` lane after an announcement channel is deleted or converted into a text channel, and removes the channel follower webhooks that follow it.
 
 Thread work runs on the `batch` lane. `deleteChannelThreads` deletes the threads of a deleted parent channel, `removeThreadMembershipsForGuildMember` removes the thread memberships of a user who is no longer a guild member, and `syncThreadSearchDocument` and `backfillThreadSearch` keep the thread search index current. `archiveInactiveThreads` runs every minute with no job record and archives the threads whose auto archive time has passed. `repairThreadIndexes` rebuilds the thread list entries of the threads it names. `seedThreadPermissions` runs once for a guild. It clears the thread permission bits from every overwrite mask. It then adds `CREATE_PUBLIC_THREADS`, `CREATE_PRIVATE_THREADS`, and `SEND_MESSAGES_IN_THREADS` to each overwrite mask that has `SEND_MESSAGES`, and to the everyone role when that role has `SEND_MESSAGES`.
 

fluxer_docs/src/content/docs/http-api/guilds.mdx

@@ -739,7 +739,7 @@ Replacing an image removes the previous asset. A failed replacement leaves the p
 
 <RouteHeader method="POST" path="/v1/guilds/{guild_id}/delete" mfa />
 
-Permanently deletes the guild and returns 204 with an empty body. Requires the guild owner and sudo mode. Emits a [Guild Delete](/gateway/events/#guild-delete) Gateway event to every member session.
+Permanently deletes the guild and returns 204 with an empty body. Requires the guild owner and sudo mode. Emits a [Guild Delete](/gateway/events/#guild-delete) Gateway event to every member session. The guild is unavailable from that point, and its channels, messages and other records are removed in the background shortly after.
 
 Fluxer refuses a non-owner with 403 `MISSING_PERMISSIONS`. A bot can never own a guild, so a bot credential never satisfies the requirement.