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## Summary Mobile reads system notices older than its loaded message window, even though those notices cannot yet appear. Bound notice reads by the oldest loaded message's timestamp to avoid fetching history outside the loaded time range. A short or empty bounded response finishes that time range, rather than all notice history. Preserve the full boundary second, resume when older message pages load, and keep notices before the first message available at the start of history. Enforce the 2,000-notice cap before fetching reactions. Reuse cached reactions and deletions when older pages reveal their notices. For channels with fewer than 500 notices, scrolling back can now require one bounded notice read per older message page. Previously, one unbounded read covered the channel. ### Related issue Related: #8962, which changed how mobile loads and displays membership notices. No duplicate notice-bound PR found in the open mobile-notice title search. ### Testing Mutation checks: removing the production `since` argument or restoring the old unconditional history-end flag each made all four notice-range cases fail. Command: `cd mobile && flutter test --no-pub --dart-define=BUZZ_PUSH_GATEWAY_URL=https://push.example test/features/channels/channel_notices_journey_test.dart --name 'notice ranges'`. Replacing the captured message cursor with a fabricated maximum ID also fails the empty-range progress regression. Command: `cd mobile && flutter test --no-pub --dart-define=BUZZ_PUSH_GATEWAY_URL=https://push.example test/features/channels/channel_messages_provider_test.dart --name 'an empty notice range'`. A read-only prepared-query check on local Postgres 17.10 used a representative kind-40099 query. It held 22 event-related relation locks with `force_custom_plan` and 99 with `force_generic_plan`. The generic plan pruned seven of eight partitions during execution but retained the broader locks. These results do not establish lock reduction or throughput improvement under the relay's actual cached-plan workload; a relay load test remains pending. Native app scrolling against a live relay and human confirmation remain pending. For the device check, run `just mobile-dev` on a host with an iOS Simulator runtime. Connect to a local test relay and open a channel with more than 150 messages and interleaved topic notices. Scroll back through at least three message pages, then to the start. Check that visible notices remain in order and appear once. Disconnect during a page read, reconnect, and continue scrolling to check recovery. Generated with Codex --------- Signed-off-by: BuzzPRReviewAssistant1 <a581a7e8115222acdc32ffb14bfce55d48c24478d98e155f8eba126b69b83c7b@buzz.block.builderlab.xyz> Co-authored-by: BuzzPRReviewAssistant1 <a581a7e8115222acdc32ffb14bfce55d48c24478d98e155f8eba126b69b83c7b@buzz.block.builderlab.xyz>