perf(usage): heatmap 改为数据库端按天聚合查询

将 admin 和 user heatmap 从逐条加载 usage audit 记录后在应用层聚合,
改为通过 SQL GROUP BY DATE 在数据库端直接按天汇总, 大幅减少数据传输量。

新增 UsageDailyHeatmapQuery / StoredUsageDailySummary 类型,
在 trait、SQL、内存实现中均补齐 summarize_usage_daily_heatmap 方法。

同时优化 docker-compose: postgres 增加空闲事务超时与 keepalive 参数,
gateway 增加健康检查配置。

apps/aether-gateway/src/handlers/admin/observability/usage/analytics_routes/heatmap.rs

@@ -1,15 +1,17 @@
 use crate::handlers::admin::request::AdminAppState;
 use crate::GatewayError;
+use aether_admin::observability::stats::round_to;
 use aether_admin::observability::usage::{
-    admin_usage_data_unavailable_response, admin_usage_heatmap_json,
-    ADMIN_USAGE_DATA_UNAVAILABLE_DETAIL,
+    admin_usage_data_unavailable_response, ADMIN_USAGE_DATA_UNAVAILABLE_DETAIL,
 };
-use aether_data_contracts::repository::usage::UsageAuditListQuery;
+use aether_data_contracts::repository::usage::UsageDailyHeatmapQuery;
 use axum::{
     body::Body,
     response::{IntoResponse, Response},
     Json,
 };
+use serde_json::json;
+use std::collections::BTreeMap;
 
 pub(super) async fn build_admin_usage_heatmap_response(
     state: &AdminAppState<'_>,
@@ -19,14 +21,64 @@ pub(super) async fn build_admin_usage_heatmap_response(
             ADMIN_USAGE_DATA_UNAVAILABLE_DETAIL,
         ));
     }
-    let now_unix_secs = u64::try_from(chrono::Utc::now().timestamp()).unwrap_or_default();
-    let created_from_unix_secs = now_unix_secs.saturating_sub(365 * 24 * 3600);
-    let mut usage = state
-        .list_usage_audits(&UsageAuditListQuery {
-            created_from_unix_secs: Some(created_from_unix_secs),
-            ..Default::default()
+    let today = chrono::Utc::now().date_naive();
+    let start_date = today
+        .checked_sub_signed(chrono::Duration::days(364))
+        .unwrap_or(today);
+    let created_from_unix_secs = u64::try_from(
+        chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(
+            start_date.and_hms_opt(0, 0, 0).unwrap_or_default(),
+            chrono::Utc,
+        )
+        .timestamp(),
+    )
+    .unwrap_or_default();
+
+    let summaries = state
+        .summarize_usage_daily_heatmap(&UsageDailyHeatmapQuery {
+            created_from_unix_secs,
+            user_id: None,
+            admin_mode: true,
         })
         .await?;
-    usage.retain(|item| item.status != "pending" && item.status != "streaming");
-    Ok(Json(admin_usage_heatmap_json(&usage)).into_response())
+
+    let grouped: BTreeMap<String, _> = summaries.into_iter().map(|s| (s.date.clone(), s)).collect();
+
+    let mut max_requests = 0_u64;
+    let mut cursor = start_date;
+    let mut days = Vec::new();
+    while cursor <= today {
+        let date_str = cursor.to_string();
+        let (requests, total_tokens, total_cost, actual_total_cost) =
+            if let Some(s) = grouped.get(&date_str) {
+                (
+                    s.requests,
+                    s.total_tokens,
+                    s.total_cost_usd,
+                    s.actual_total_cost_usd,
+                )
+            } else {
+                (0, 0, 0.0, 0.0)
+            };
+        max_requests = max_requests.max(requests);
+        days.push(json!({
+            "date": date_str,
+            "requests": requests,
+            "total_tokens": total_tokens,
+            "total_cost": round_to(total_cost, 6),
+            "actual_total_cost": round_to(actual_total_cost, 6),
+        }));
+        cursor = cursor
+            .checked_add_signed(chrono::Duration::days(1))
+            .unwrap_or(today + chrono::Duration::days(1));
+    }
+
+    Ok(Json(json!({
+        "start_date": start_date.to_string(),
+        "end_date": today.to_string(),
+        "total_days": days.len(),
+        "max_requests": max_requests,
+        "days": days,
+    }))
+    .into_response())
 }