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channels: give kicked/banned/promoted/transferred users a real qts so their client applies it

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updateChannelParticipant carries the account's qts per the MTProto spec, but
the server always sent Qts: 0, so real clients silently discarded it as a
stale duplicate -- the banned/kicked user's channel never vanished locally
and no correct "removed by admin" message showed, even though the update was
delivered successfully at the transport layer.

Add a durable per-device qts queue (channel_participant_event_queue) sharing
its qts number space with the existing secret-chat queue (one qts sequence
per device, per spec), and use it to stamp a correct, monotonically
increasing qts on the update for every device of the affected user -- for
channel bans/kicks, admin promotion/demotion, and ownership transfer. A
device offline when it happened can now recover the event via
updates.getDifference instead of missing it permanently.
This commit is contained in:
Astra 2026-09-15 15:43:52 +01:00
parent 97711c9d2e
commit 206bde18e0
16 changed files with 482 additions and 42 deletions
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deploy/migrations/20260915000001_channel_participant_event_queue.down.sql Normal file
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DROP TABLE IF EXISTS public.channel_participant_event_queue;

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deploy/migrations/20260915000001_channel_participant_event_queue.up.sql Normal file
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-- Durable per-device qts queue for channel-membership self-notifications
-- (kick/ban/promote/demote/ownership transfer). Shares the qts number space
-- in secret_qts_watermarks with encrypted_message_queue: a device has one
-- qts sequence, and updateChannelParticipant rides it per the MTProto spec,
-- so a disconnected device can recover a missed kick/ban via
-- updates.getDifference instead of losing it once its live push is missed.
CREATE TABLE public.channel_participant_event_queue (
receiver_auth_key_id bigint NOT NULL,
qts integer NOT NULL,
receiver_user_id bigint NOT NULL,
channel_id bigint NOT NULL,
actor_user_id bigint NOT NULL,
date integer NOT NULL,
previous_participant jsonb,
new_participant jsonb,
acked boolean DEFAULT false NOT NULL,
created_at timestamp with time zone DEFAULT now() NOT NULL,
PRIMARY KEY (receiver_auth_key_id, qts)
);
CREATE INDEX idx_cpeq_unacked ON public.channel_participant_event_queue USING btree (receiver_auth_key_id, qts) WHERE (acked = false);