feat(config): add live slow-sql threshold setting

services/slow_sql_metrics.py

@@ -21,6 +21,10 @@ _RECENT_LIMIT = max(10, int(os.environ.get("DB_SLOW_SQL_RECENT_LIMIT", "50") or
 _MAX_EVENTS = max(_RECENT_LIMIT, int(os.environ.get("DB_SLOW_SQL_MAX_EVENTS", "20000") or 20000))
 _SQL_MAX_LEN = max(80, int(os.environ.get("DB_SLOW_QUERY_SQL_MAX_LEN", "240") or 240))
 
+_runtime_lock = threading.Lock()
+_runtime_threshold_ms = _SLOW_SQL_THRESHOLD_MS
+_runtime_sql_max_len = _SQL_MAX_LEN
+
 _lock = threading.Lock()
 
 _state = {
@@ -38,8 +42,29 @@ def _compact_text(value: str, max_len: int) -> str:
     return f"{text[: max_len - 3]}..."
 
 
+def _get_runtime_values() -> tuple[float, int]:
+    with _runtime_lock:
+        return float(_runtime_threshold_ms), int(_runtime_sql_max_len)
+
+
+def configure_slow_sql_runtime(*, threshold_ms=None, sql_max_len=None) -> dict:
+    global _runtime_threshold_ms, _runtime_sql_max_len
+
+    with _runtime_lock:
+        if threshold_ms is not None:
+            _runtime_threshold_ms = max(0.0, float(threshold_ms))
+        if sql_max_len is not None:
+            _runtime_sql_max_len = max(80, int(sql_max_len))
+
+        return {
+            "threshold_ms": float(_runtime_threshold_ms),
+            "sql_max_len": int(_runtime_sql_max_len),
+        }
+
+
 def _compact_sql(sql: str) -> str:
-    return _compact_text(str(sql or ""), _SQL_MAX_LEN)
+    _, sql_max_len = _get_runtime_values()
+    return _compact_text(str(sql or ""), sql_max_len)
 
 
 def _compact_params(params_info: str) -> str:
@@ -165,12 +190,14 @@ def get_slow_sql_metrics_snapshot() -> dict:
     total_events = len(events)
     avg_duration_ms = round((total_duration_ms / total_events), 2) if total_events > 0 else 0.0
 
+    runtime_threshold_ms, _ = _get_runtime_values()
+
     return {
         "since_ts": int(float(events[0].get("time") or 0.0)) if events else 0,
         "window_seconds": _WINDOW_SECONDS,
         "top_limit": _TOP_LIMIT,
         "recent_limit": _RECENT_LIMIT,
-        "slow_threshold_ms": _SLOW_SQL_THRESHOLD_MS,
+        "slow_threshold_ms": runtime_threshold_ms,
         "total_slow_queries": total_events,
         "unique_sql": len(grouped),
         "avg_duration_ms": avg_duration_ms,