Blocks page '24h' stats show yesterday's calendar day, not rolling 24h window

[ianakiara]

Summary

The blocks page (/blocks) displays three stat cards labeled "Blocks 24h", "Rewards 24h", and "Burned 24h". These labels imply a rolling 24-hour window from the current moment, but the data actually represents yesterday's completed calendar day (midnight-to-midnight).

Evidence

1. Frontend calls yesterdayStatisticsCall()

File: src/services/apiCalls.ts

export const yesterdayStatisticsCall = async (): Promise<IBlockStats> => {
  const res = await api.get({
    route: 'block/statistics-by-day/1',
  });
  return res.data.block_stats_by_day[0];
};

The function is explicitly named yesterdayStatisticsCall, and it hits block/statistics-by-day/1.

2. API endpoint returns calendar-day buckets

The upstream Klever API endpoint block/statistics-by-day/{N} returns N discrete calendar-day records, each with a date field (Unix timestamp for that day). The {N} parameter is the number of past days to return — not a rolling hour window.

Confirmed by the charts page (src/pages/charts/index.tsx), which calls block/statistics-by-day/15 and formats each record's date as:

date: format(stats.date, 'dd MMM')  // e.g., "05 Mar"

This proves each record maps to a specific calendar date, not a sliding time window.

3. UI labels are misleading

File: src/pages/blocks/index.tsx (lines 189-247)

const cards: ICard[] = [
  {
    title: 'Number of Blocks',
    headers: ['Blocks 24h', 'Cumulative Number'],       // ← misleading
    values: [blocksStatsYesterday?.totalBlocks, ...],
  },
  {
    title: 'Block Reward',
    headers: ['Rewards 24h', 'Cumulative Revenue'],      // ← misleading
    values: [blocksStatsYesterday?.totalBlockRewards, ...],
  },
  {
    title: 'Stats on Burned KLV',
    headers: ['Burned 24h', 'Burned in Total'],           // ← misleading
    values: [blocksStatsYesterday?.totalBurned, ...],
  },
];

All three cards use blocksStatsYesterday (from yesterdayStatisticsCall) but label the values as "24h".

4. No rolling 24h endpoint exists

The upstream Klever API only exposes:

• block/statistics-by-day/{N} — calendar-day buckets
• block/statistics-total/0 — all-time cumulative totals

There is no block/statistics-rolling/24h or time-range-based block statistics endpoint.

Impact

Users see "Blocks 24h" / "Rewards 24h" / "Burned 24h" and expect data from the last 24 hours. Instead, they get yesterday's full-day stats, which can be up to ~48 hours stale (e.g., at 11:59 PM, the data still reflects the day before).

Options

1. Fix the label — Rename "24h" → "Yesterday" in the frontend to match the actual data semantics. Quick fix, accurate UX.
2. Fix the data — Implement a rolling 24h aggregation (either via a new upstream API endpoint, or a proxy endpoint in kleverscan-api that fetches recent blocks and aggregates client-side). Correct UX, requires backend work.
3. Both — Fix labels now as a quick win, then implement true 24h data as a follow-up.

Affected files

• src/pages/blocks/index.tsx — card labels and data binding
• src/services/apiCalls.ts — yesterdayStatisticsCall() function