sliding_sync_membership_snapshots

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CREATE TABLE sliding_sync_membership_snapshots(
    room_id TEXT NOT NULL REFERENCES rooms(room_id),
    user_id TEXT NOT NULL,
    -- Useful to be able to tell leaves from kicks (where the `user_id` is different from the `sender`)
    sender TEXT NOT NULL,
    membership_event_id TEXT NOT NULL REFERENCES events(event_id),
    membership TEXT NOT NULL,
    -- This is an integer just to match `room_memberships` and also means we don't need
    -- to do any casting.
    forgotten INTEGER DEFAULT 0 NOT NULL,
    -- `stream_ordering` of the `membership_event_id`
    event_stream_ordering BIGINT NOT NULL REFERENCES events(stream_ordering),
    -- `instance_name` of the worker that persisted the `membership_event_id`.
    -- Useful for crafting `PersistedEventPosition(...)`
    event_instance_name TEXT NOT NULL,
    -- For remote invites/knocks that don't include any stripped state, we want to be
    -- able to distinguish between a room with `None` as valid value for some state and
    -- room where the state is completely unknown. Basically, this should be True unless
    -- no stripped state was provided for a remote invite/knock (False).
    has_known_state BOOLEAN DEFAULT FALSE NOT NULL,
    -- `m.room.create` -> `content.type` (according to the current state at the time of
    -- the membership).
    --
    -- Useful for the `spaces`/`not_spaces` filter in the Sliding Sync API
    room_type TEXT,
    -- `m.room.name` -> `content.name` (according to the current state at the time of
    -- the membership).
    --
    -- Useful for the room meta data and `room_name_like` filter in the Sliding Sync API
    room_name TEXT,
    -- `m.room.encryption` -> `content.algorithm` (according to the current state at the
    -- time of the membership).
    --
    -- Useful for the `is_encrypted` filter in the Sliding Sync API
    is_encrypted BOOLEAN DEFAULT FALSE NOT NULL,
    -- `m.room.tombstone` -> `content.replacement_room` (according to the current state at the
    -- time of the membership).
    --
    -- Useful for the `include_old_rooms` functionality in the Sliding Sync API
    tombstone_successor_room_id TEXT,
    PRIMARY KEY (room_id, user_id)
);
CREATE UNIQUE INDEX sliding_sync_membership_snapshots_event_stream_ordering ON sliding_sync_membership_snapshots(event_stream_ordering);
CREATE INDEX sliding_sync_membership_snapshots_membership_event_id_idx ON sliding_sync_membership_snapshots (membership_event_id) ;
CREATE INDEX sliding_sync_membership_snapshots_user_id_stream_ordering ON sliding_sync_membership_snapshots (user_id, event_stream_ordering) ;