-- 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);