feat(report): add 24h slow-sql dashboard and metrics api

routes/admin_api/infra_api.py

@@ -14,6 +14,7 @@ from flask import jsonify, session
 from routes.admin_api import admin_api_bp
 from routes.decorators import admin_required
 from services.request_metrics import get_request_metrics_snapshot
+from services.slow_sql_metrics import get_slow_sql_metrics_snapshot
 from services.time_utils import BEIJING_TZ, get_beijing_now
 
 logger = get_logger("app")
@@ -30,6 +31,10 @@ _REQUEST_METRICS_CACHE_TTL = max(1.0, float(os.environ.get("ADMIN_REQUEST_METRIC
 _request_metrics_cache: dict[str, object] = {"expires_at_monotonic": 0.0, "data": None}
 _request_metrics_cache_lock = threading.Lock()
 
+_SLOW_SQL_METRICS_CACHE_TTL = max(1.0, float(os.environ.get("ADMIN_SLOW_SQL_METRICS_CACHE_TTL_SECONDS", "3")))
+_slow_sql_metrics_cache: dict[str, object] = {"expires_at_monotonic": 0.0, "data": None}
+_slow_sql_metrics_cache_lock = threading.Lock()
+
 
 def _get_system_stats_cached() -> dict:
     now = time.monotonic()
@@ -65,6 +70,23 @@ def _get_request_metrics_cached() -> dict:
     return dict(fresh_data)
 
 
+def _get_slow_sql_metrics_cached() -> dict:
+    now = time.monotonic()
+    with _slow_sql_metrics_cache_lock:
+        expires_at = float(_slow_sql_metrics_cache.get("expires_at_monotonic") or 0.0)
+        cached_data = _slow_sql_metrics_cache.get("data")
+        if isinstance(cached_data, dict) and now < expires_at:
+            return dict(cached_data)
+
+    fresh_data = get_slow_sql_metrics_snapshot() or {}
+
+    with _slow_sql_metrics_cache_lock:
+        _slow_sql_metrics_cache["data"] = dict(fresh_data)
+        _slow_sql_metrics_cache["expires_at_monotonic"] = now + _SLOW_SQL_METRICS_CACHE_TTL
+
+    return dict(fresh_data)
+
+
 @admin_api_bp.route("/stats", methods=["GET"])
 @admin_required
 def get_system_stats():
@@ -86,6 +108,18 @@ def get_request_metrics():
         return jsonify({"error": "获取请求级监控指标失败"}), 500
 
 
+@admin_api_bp.route("/slow_sql_metrics", methods=["GET"])
+@admin_required
+def get_slow_sql_metrics():
+    """获取慢 SQL 监控指标"""
+    try:
+        metrics = _get_slow_sql_metrics_cached()
+        return jsonify(metrics)
+    except Exception as e:
+        logger.exception(f"获取慢 SQL 监控指标失败: {e}")
+        return jsonify({"error": "获取慢 SQL 监控指标失败"}), 500
+
+
 @admin_api_bp.route("/browser_pool/stats", methods=["GET"])
 @admin_required
 def get_browser_pool_stats():