perf: cap the exchange search count at 10,000 - #283
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An exact total has to visit every matching row, which cost more than fetching the rows did. Stop at 10,000 and report "10,000+" past that. Unfiltered 63ms -> 19ms, Success 213ms -> 35ms, property key 257ms -> 34ms on a million rows.
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📝 WalkthroughSummary
Risk: risk:low Security-sensitive areas: None. The change affects count calculation and client-side paging only. Test coverage impact:
Operational concerns:
WalkthroughThe exchange search API now caps total-match counting at 10,001. The exchanges page displays capped totals as “10,000+” and determines continued pagination from page fullness when the cap applies. ChangesExchange count cap
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Capped pagination can expose an empty final page for some large result sets, after which the normal navigation controls may disappear. This is a localized minor issue that is mergeable with explicit owner awareness or follow-up. Suggested labels: Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 1
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Inline comments:
In `@SW.Bitween.Web/ClientApp/src/pages/exchanges/ExchangesPage.tsx`:
- Line 473: Update the pagination logic in ExchangesPage around the
totalIsCapped disabled condition to handle an empty page after capped results,
including exact PAGE_SIZE multiples above the cap. When the next request returns
no rows, automatically return to the previous page or provide a recovery control
so the paging footer and Previous action remain usable.
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SW.Bitween.Api/Resources/Xchanges/Search.csSW.Bitween.Web/ClientApp/src/pages/exchanges/ExchangesPage.tsx
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🔇 Additional comments (2)
SW.Bitween.Api/Resources/Xchanges/Search.cs (1)
17-22: LGTM!Also applies to: 187-197
SW.Bitween.Web/ClientApp/src/pages/exchanges/ExchangesPage.tsx (1)
21-28: LGTM!Also applies to: 124-124, 451-458
The empty-results branch replaces the table and its paging footer, so a page beyond the last one left nothing to click. Reachable by clicking Next past the count cap when the last page happens to be full, and by any hand-typed offset. Raised by CodeRabbit on #283.
2 participants
Why
The exchanges page was slow whenever a filter was on. Measured on a 1,000,000-row copy, the rows themselves came back in a few milliseconds — the time was going into the footer's total. An exact count cannot stop early: it has to visit every matching row, so the broader the filter, the more it costs.
What changed
The backend stops counting at 10,000 and returns
CountCap + 1instead. The footer renders that as "10,000+".Anything filtered narrowly enough to actually page through still gets an exact number — 10,000 rows is 400 pages of Next.
Processing is unchanged because its cost is the anti-join from #281, not the count.
This also takes the pressure off the page's 15-second auto-refresh: the refresh still recounts, it just costs 2–35 ms instead of 200–500 ms.
The paging catch
Next was disabled by comparing the offset against the total, so a capped total would have dead-ended paging at row 10,000. Below the cap it still uses the exact total (Next stops on the true last page); above it, it falls back to "was this page full".
Verified in a browser
Showing 1–25 of 10,000+Showing 1–25 of 10,000+Showing 1–25 of 2,884Showing 2876–2884 of 2,884Showing 1–1 of 1Showing 25001–25025 of 10,000+Generated SQL is
SELECT count(*)::int FROM (SELECT 1 FROM ... LIMIT @__p_1) AS s0.🤖 Generated with Claude Code