feat(clickhouse): wire ClickHouseStatsStore with cameleer.storage.stats feature flag (default: clickhouse)

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/StorageBeanConfig.java

@@ -2,6 +2,7 @@ package com.cameleer3.server.app.config;
 
 import com.cameleer3.server.app.storage.ClickHouseMetricsQueryStore;
 import com.cameleer3.server.app.storage.ClickHouseMetricsStore;
+import com.cameleer3.server.app.storage.ClickHouseStatsStore;
 import com.cameleer3.server.app.storage.PostgresMetricsQueryStore;
 import com.cameleer3.server.app.storage.PostgresMetricsStore;
 import com.cameleer3.server.core.admin.AuditRepository;
@@ -16,6 +17,7 @@ import com.cameleer3.server.core.ingestion.IngestionService;
 import com.cameleer3.server.core.ingestion.MergedExecution;
 import com.cameleer3.server.core.ingestion.WriteBuffer;
 import com.cameleer3.server.core.storage.*;
+import com.cameleer3.server.core.storage.StatsStore;
 import com.cameleer3.server.core.storage.model.MetricsSnapshot;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
@@ -118,4 +120,13 @@ public class StorageBeanConfig {
             @Qualifier("clickHouseJdbcTemplate") JdbcTemplate clickHouseJdbc) {
         return new ClickHouseSearchIndex(clickHouseJdbc);
     }
+
+    // ── ClickHouse Stats Store ─────────────────────────────────────────
+
+    @Bean
+    @ConditionalOnProperty(name = "cameleer.storage.stats", havingValue = "clickhouse", matchIfMissing = true)
+    public StatsStore clickHouseStatsStore(
+            @Qualifier("clickHouseJdbcTemplate") JdbcTemplate clickHouseJdbc) {
+        return new ClickHouseStatsStore(clickHouseJdbc);
+    }
 }

cameleer3-server-app/src/main/java/com/cameleer3/server/app/storage/PostgresStatsStore.java

@@ -5,6 +5,7 @@ import com.cameleer3.server.core.search.StatsTimeseries;
 import com.cameleer3.server.core.search.StatsTimeseries.TimeseriesBucket;
 import com.cameleer3.server.core.search.TopError;
 import com.cameleer3.server.core.storage.StatsStore;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Repository;
 
@@ -18,6 +19,7 @@ import java.util.List;
 import java.util.Map;
 
 @Repository
+@ConditionalOnProperty(name = "cameleer.storage.stats", havingValue = "postgres")
 public class PostgresStatsStore implements StatsStore {
 
     private final JdbcTemplate jdbc;

cameleer3-server-app/src/main/resources/application.yml

@@ -51,6 +51,7 @@ cameleer:
   storage:
     metrics: ${CAMELEER_STORAGE_METRICS:postgres}
     search: ${CAMELEER_STORAGE_SEARCH:opensearch}
+    stats: ${CAMELEER_STORAGE_STATS:clickhouse}
 
 security:
   access-token-expiry-ms: 3600000

deploy/base/server.yaml

@@ -93,6 +93,8 @@ spec:
               value: "postgres"
             - name: CAMELEER_STORAGE_SEARCH
               value: "opensearch"
+            - name: CAMELEER_STORAGE_STATS
+              value: "clickhouse"
 
           resources:
             requests: