diff --git a/apps/metrics/backend/services/starrocks_metrics_service.py b/apps/metrics/backend/services/starrocks_metrics_service.py
index 329815b..648dd74 100644
--- a/apps/metrics/backend/services/starrocks_metrics_service.py
+++ b/apps/metrics/backend/services/starrocks_metrics_service.py
@@ -25,7 +25,7 @@ class StarRocksMetricsService:
                     updated_at
                 FROM dws_daily_registered_users 
                 WHERE date_id >= %s 
-                  AND date_id <= %s 
+                  AND date_id < %s 
                   AND product_id = %s
                 ORDER BY date_id ASC
             """,
diff --git a/apps/metrics/docs/design.md b/apps/metrics/docs/design.md
index 796b5ae..ea9fa46 100644
--- a/apps/metrics/docs/design.md
+++ b/apps/metrics/docs/design.md
@@ -8,6 +8,159 @@ We support two ways to query metrics:
 
 We can implement StarRocks Metric queries similar to Prometheus Metric queries. The only difference is replacing PromQL with SQL and querying through StarRocks API.
 
+## 2.1.Metrics Config
+Currently, metrics are configured in code through the `StarRocksMetricsService.METRIC_SQL_MAP` dictionary. In the future, they will be configured through database or other methods.
+Organization structure: Product ID -> Metric Name -> SQL Query
+```python
+METRIC_SQL_MAP: Dict[str, Dict[str, str]] = {
+    "freeleaps": {
+        "daily_registered_users": """
+            SELECT 
+                date_id,
+                product_id,
+                registered_cnt,
+                updated_at
+            FROM dws_daily_registered_users 
+            WHERE date_id >= %s 
+              AND date_id <= %s 
+              AND product_id = %s
+            ORDER BY date_id ASC
+        """,
+    },
+    "magicleaps": {
+        # Future metrics can be added here
+    }
+}
+```
+
+## 2.2.API Design
+
+### 2.2.1.Query Metrics by Product ID
+
+API: `/api/metrics/starrocks/product/{product_id}/available-metrics`
+
+Method: GET
+Request:
+```
+product_id=freeleaps
+```
+Response:
+
+```json
+{
+  "product_id": "freeleaps",
+  "available_metrics": [
+    "daily_registered_users"
+  ],
+  "total_count": 1,
+  "description": "List of StarRocks-backed metrics for product 'freeleaps'"
+}
+```
+
+### 2.2.2.Query Metric Info
+API: `/api/metrics/starrocks/product/{product_id}/metric/{metric_name}/info`
+
+Method: GET
+Request:
+```
+product_id=freeleaps
+metric_name=daily_registered_users
+```
+Response:
+
+```json
+{
+  "metric_info": {
+    "product_id": "freeleaps",
+    "metric_name": "daily_registered_users",
+    "sql_query": "SELECT date_id, product_id, registered_cnt, updated_at FROM dws_daily_registered_users WHERE date_id >= %s AND date_id <= %s AND product_id = %s ORDER BY date_id ASC",
+    "description": "Daily registered users count from StarRocks table dws_daily_registered_users"
+  },
+  "description": "Information about StarRocks metric 'daily_registered_users' in product 'freeleaps'"
+}
+```
+
+### 2.2.3.Query Metric Data
+API: `/api/metrics/starrocks/metrics_query`
+
+Method: POST
+Request:
+```json
+{
+    "product_id": "freeleaps",
+    "metric_name": "daily_registered_users",
+    "start_date": "2024-09-10",
+    "end_date": "2024-09-20"
+}
+```
+Response:
+
+```json
+{
+  "metric_name": "daily_registered_users",
+  "data_points": [
+    {
+      "date": "2024-09-10",
+      "value": 45,
+      "labels": {
+        "product_id": "freeleaps",
+        "metric_type": "daily_registered_users"
+      }
+    },
+    {
+      "date": "2024-09-11",
+      "value": 52,
+      "labels": {
+        "product_id": "freeleaps",
+        "metric_type": "daily_registered_users"
+      }
+    },
+    {
+      "date": "2024-09-12",
+      "value": 38,
+      "labels": {
+        "product_id": "freeleaps",
+        "metric_type": "daily_registered_users"
+      }
+    },
+    ...
+    {
+      "date": "2024-09-19",
+      "value": 67,
+      "labels": {
+        "product_id": "freeleaps",
+        "metric_type": "daily_registered_users"
+      }
+    }
+  ],
+  "total_points": 10,
+  "time_range": {
+    "start": "2024-09-10",
+    "end": "2024-09-19"
+  }
+}
+```
+
+## 2.3.Technical Implementation
+
+### 2.3.1.StarRocks Client
+- Uses PyMySQL to connect to StarRocks database
+- Supports parameterized queries for security
+- Automatic connection management with context manager
+- Error handling and logging
+
+### 2.3.2.Data Format
+- Date format: `YYYY-MM-DD`
+- Values are returned as integers or floats
+- Labels include product_id and metric_type for debugging
+- Results are sorted by date in ascending order
+
+### 2.3.3.Validation
+- Date range validation (start_date < end_date)
+- Maximum date range limit (1 year)
+- Product ID and metric name validation against available mappings
+- Input format validation for date strings
+
 # 3.Prometheus Metric
 
 ## 3.1.Metrics Config