Architectural review of the topic recency indexes and pagination:
- Indexer topic index maintenance lives in its own topic-indexing.js,
separate from the action handlers; the backfill library takes injected
LevelDB handles so its logic stays testable.
- DB listTopics reads counts from topicSummaries and paginates the
topicRecency index without iterating the rooms store; the client reuses
PaginatedPage.
- Kill four topic-indexing mutation survivors with focused unit tests
covering the height fallbacks, plus exact-key/isNotFound and max-size
boundary tests.
- One topic-message survivor is an intrinsic equivalent: handlePost reads
the text at push index 1 and ignores push index 0.
Includes tool-written mutate4javascript and acceptance-mutation manifests.
By architect.
Add Gherkin for efficient GET /topics ordering by most recent post, the
topicSummaries and topicRecency index stores, an idempotent backfill, and
client topics-page pagination.
By specifier.
Chris Troutner