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Leave members who are unread already out of a new message's update

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Every message rewrote the row of every disconnected member of the room,
including the ones who were unread already and stay unread. Open rooms
take in the whole account, so in steady state that is every member on
every message: 325 WAL pages per post at 10,000 members, against 16 when
only the members who had read the room are written.

Directs keep touching all their members: a direct's sidebar row is
cached by its membership and carries the room's recency, so it has to
be refreshed on every message.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017dFSDHrgrLoBELwjV3Qunq
This commit is contained in:
Marcello Costagliola
2026-10-07 16:41:20 +02:00
parent c49f53d8f8
commit af4f94c4bd
3 changed files with 56 additions and 1 deletions
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app/models/room.rb
+6 -1
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@@ -104,8 +104,13 @@ class Room < ApplicationRecord
end
end
# Rewriting every member on every message is most of what posting to a large room writes,
# so members who are unread already stay as they are. Directs keep touching them all: a
# direct's sidebar row is cached by membership and shows the room's recency.
def unread_memberships(message)
memberships.visible.disconnected.where.not(user: message.creator).update_all(unread_at: message.created_at, updated_at: Time.current)
recipients = memberships.visible.disconnected.where.not(user: message.creator)
recipients = recipients.where(unread_at: nil) unless direct?
recipients.update_all(unread_at: message.created_at, updated_at: Time.current)
end
def push_later(message)