Move failed count and avg duration from page-derived to backend stats

All stat card values now come from the /search/stats endpoint which
queries the full time window, not just the current page of results.
Consolidated into a single ClickHouse query for efficiency.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/search/ClickHouseSearchEngine.java

@@ -89,16 +89,18 @@ public class ClickHouseSearchEngine implements SearchEngine {
 
     @Override
     public ExecutionStats stats(Instant from, Instant to) {
-        Long p99 = jdbcTemplate.queryForObject(
-                "SELECT toInt64(quantile(0.99)(duration_ms)) FROM route_executions " +
-                "WHERE start_time >= ? AND start_time <= ?",
-                Long.class, Timestamp.from(from), Timestamp.from(to));
-        Long active = jdbcTemplate.queryForObject(
-                "SELECT count() FROM route_executions WHERE status = 'RUNNING'",
-                Long.class);
-        return new ExecutionStats(
-                p99 != null ? p99 : 0L,
-                active != null ? active : 0L);
+        return jdbcTemplate.queryForObject(
+                "SELECT countIf(status = 'FAILED') AS failed_count, " +
+                "toInt64(avg(duration_ms)) AS avg_duration_ms, " +
+                "toInt64(quantile(0.99)(duration_ms)) AS p99_duration_ms, " +
+                "countIf(status = 'RUNNING') AS active_count " +
+                "FROM route_executions WHERE start_time >= ? AND start_time <= ?",
+                (rs, rowNum) -> new ExecutionStats(
+                        rs.getLong("failed_count"),
+                        rs.getLong("avg_duration_ms"),
+                        rs.getLong("p99_duration_ms"),
+                        rs.getLong("active_count")),
+                Timestamp.from(from), Timestamp.from(to));
     }
 
     @Override

cameleer3-server-core/src/main/java/com/cameleer3/server/core/search/ExecutionStats.java

@@ -1,9 +1,11 @@
 package com.cameleer3.server.core.search;
 
 /**
- * Aggregate execution statistics.
+ * Aggregate execution statistics within a time window.
  *
- * @param p99LatencyMs 99th percentile duration in milliseconds within the requested time window
- * @param activeCount  number of currently running executions
+ * @param failedCount   number of failed executions
+ * @param avgDurationMs average duration in milliseconds
+ * @param p99LatencyMs  99th percentile duration in milliseconds
+ * @param activeCount   number of currently running executions
  */
-public record ExecutionStats(long p99LatencyMs, long activeCount) {}
+public record ExecutionStats(long failedCount, long avgDurationMs, long p99LatencyMs, long activeCount) {}

ui/src/api/openapi.json

@@ -1049,6 +1049,14 @@
       "ExecutionStats": {
         "type": "object",
         "properties": {
+          "failedCount": {
+            "type": "integer",
+            "format": "int64"
+          },
+          "avgDurationMs": {
+            "type": "integer",
+            "format": "int64"
+          },
           "p99LatencyMs": {
             "type": "integer",
             "format": "int64"

ui/src/api/schema.d.ts

@@ -217,6 +217,8 @@ export interface ProcessorNode {
 export type ProcessorSnapshot = Record<string, string>;
 
 export interface ExecutionStats {
+  failedCount: number;
+  avgDurationMs: number;
   p99LatencyMs: number;
   activeCount: number;
 }

ui/src/pages/executions/ExecutionExplorer.tsx

@@ -24,12 +24,6 @@ export function ExecutionExplorer() {
   const total = data?.total ?? 0;
   const results = data?.data ?? [];
 
-  // Derive stats from current search results
-  const failedCount = results.filter((r) => r.status === 'FAILED').length;
-  const avgDuration = results.length > 0
-    ? Math.round(results.reduce((sum, r) => sum + r.durationMs, 0) / results.length)
-    : 0;
-
   const showFrom = total > 0 ? offset + 1 : 0;
   const showTo = Math.min(offset + limit, total);
 
@@ -50,8 +44,8 @@ export function ExecutionExplorer() {
       {/* Stats Bar */}
       <div className={styles.statsBar}>
         <StatCard label="Total Matches" value={total.toLocaleString()} accent="amber" change={`from current search`} sparkData={sparkTotal} />
-        <StatCard label="Avg Duration" value={`${avgDuration.toLocaleString()}ms`} accent="cyan" sparkData={sparkAvgDuration} />
-        <StatCard label="Failed (page)" value={failedCount.toLocaleString()} accent="rose" sparkData={sparkFailed} />
+        <StatCard label="Avg Duration" value={stats ? `${stats.avgDurationMs.toLocaleString()}ms` : '--'} accent="cyan" sparkData={sparkAvgDuration} />
+        <StatCard label="Failed" value={stats ? stats.failedCount.toLocaleString() : '--'} accent="rose" sparkData={sparkFailed} />
         <StatCard label="P99 Latency" value={stats ? `${stats.p99LatencyMs.toLocaleString()}ms` : '--'} accent="green" sparkData={sparkP99} />
         <StatCard label="In-Flight" value={stats ? stats.activeCount.toLocaleString() : '--'} accent="blue" change="running executions" sparkData={sparkActive} />
       </div>