sync product to local

lib/core/performance/database_monitor.dart

@@ -0,0 +1,64 @@
+import 'dart:developer';
+
+class DatabasePerformanceMonitor {
+  static final Map<String, List<int>> _queryTimes = {};
+
+  static Future<T> monitorQuery<T>(
+    String queryName,
+    Future<T> Function() query,
+  ) async {
+    final stopwatch = Stopwatch()..start();
+
+    try {
+      final result = await query();
+      stopwatch.stop();
+
+      _recordQueryTime(queryName, stopwatch.elapsedMilliseconds);
+
+      return result;
+    } catch (e) {
+      stopwatch.stop();
+      log('Query "$queryName" failed after ${stopwatch.elapsedMilliseconds}ms: $e');
+      rethrow;
+    }
+  }
+
+  static void _recordQueryTime(String queryName, int milliseconds) {
+    if (!_queryTimes.containsKey(queryName)) {
+      _queryTimes[queryName] = [];
+    }
+
+    _queryTimes[queryName]!.add(milliseconds);
+
+    // Keep only last 100 entries
+    if (_queryTimes[queryName]!.length > 100) {
+      _queryTimes[queryName]!.removeAt(0);
+    }
+
+    // Log slow queries
+    if (milliseconds > 1000) {
+      log('Slow query detected: "$queryName" took ${milliseconds}ms');
+    }
+  }
+
+  static Map<String, dynamic> getPerformanceStats() {
+    final stats = <String, dynamic>{};
+
+    _queryTimes.forEach((queryName, times) {
+      if (times.isNotEmpty) {
+        final avgTime = times.reduce((a, b) => a + b) / times.length;
+        final maxTime = times.reduce((a, b) => a > b ? a : b);
+        final minTime = times.reduce((a, b) => a < b ? a : b);
+
+        stats[queryName] = {
+          'average_ms': avgTime.round(),
+          'max_ms': maxTime,
+          'min_ms': minTime,
+          'total_queries': times.length,
+        };
+      }
+    });
+
+    return stats;
+  }
+}