diff --git a/.gitignore b/.gitignore
index e5cb804..2335d78 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /django_debug.log
+**/__pycache__/
diff --git a/apps/monitoring/statistics.py b/apps/monitoring/statistics.py
index 7bd4283..4194667 100644
--- a/apps/monitoring/statistics.py
+++ b/apps/monitoring/statistics.py
@@ -1,10 +1,11 @@
 from datetime import timedelta
 
+from django.db.models import Avg
+from django.utils import timezone
 from django.utils.timezone import now
 
 from apps.monitoring.models import UptimeRecord
 
-
 QUERY_TIME_RANGE_TYPE = {
     1: "Last 1 hour",
     3: "Last 3 hours",
@@ -12,31 +13,103 @@
     24: "Last 24 hours",
     168: "Last 7 days",
     720: "Last 30 days",
+    -1: "All time",
 }
 
 
-def calculate_past(time_range=None):
+def calculate_past_summary(time_range=None):
     """
     Given an time range in HOUR?DATE, query all UptimeRecord and
     calculate uptime percentage and the average response time
 
-    :return: uptime_percentage and avg_response_time
+    :return:total_records, uptime_percentage and avg_response_time
     """
-
     uptime_percentage, avg_response_time = None, None
-    if not time_range or time_range.value not in QUERY_TIME_RANGE_TYPE.keys():
+    if (not time_range) or (time_range not in QUERY_TIME_RANGE_TYPE.keys()):
         return uptime_percentage and avg_response_time
-    time_delta = time_range.value
+    time_delta = time_range
     results = UptimeRecord.objects.filter(
         created_at__gte=now() - timedelta(hours=time_delta)
     )
-    # results = UptimeRecord.objects.filter(created_at? range)
-    sum_avg_time, sum_uptime = 0, 0
     total_records = results.count()
-    for record in results:
-        sum_avg_time += record.response_time
-        sum_uptime += 1 if record.status else 0
-    if total_records:
-        avg_response_time = sum_avg_time / total_records
-        uptime_percentage = (sum_uptime / total_records) * 100
-    return uptime_percentage, avg_response_time
+    up_records = results.filter(status=True).count()
+    average_response_time = (
+        results.filter(status=True).aggregate(Avg("response_time"))[
+            "response_time__avg"
+        ]
+        or 0
+    )
+
+    uptime_percentage = (up_records / total_records) * 100 if total_records else 0
+
+    return total_records, uptime_percentage, average_response_time
+
+
+def calculate_past_chart(time_range, split_interval):
+    """
+    Given a time range in HOUR, query all UptimeRecord and
+    calculate uptime_percentage and the average_response_time in the interval for chart,
+    the interval is calculated by showing 30 records in the chart. E.g. if the time_range is 720 hours,
+    the chart will show 30 records, each record represents 24 hours.
+    :return: a json contains a summary of uptime percentage and average response time, following 30 detailed records
+    where each record contains total_records, uptime_percentage, average_response_time, time_start and time_end
+
+    """
+
+    if (not time_range) or (time_range not in QUERY_TIME_RANGE_TYPE.keys()):
+        return KeyError("Invalid time range")
+    # iterate 30 intervals in the given time range
+    if split_interval < 1:
+        split_interval = 1
+    delta = timedelta(hours=time_range / split_interval)
+    start_time = now() - timedelta(hours=time_range)
+    total_records, total_up_records = 0, 0
+    all_results = []
+    total_avg_response_time = []
+
+    for _ in range(split_interval):
+        end_time = start_time + delta
+        results = UptimeRecord.objects.filter(
+            created_at__gte=start_time, created_at__lt=end_time
+        )
+        interval_total_records = results.count()
+        interval_up_records = results.filter(status=True).count()
+        average_response_time = (
+            results.filter(status=True).aggregate(Avg("response_time"))[
+                "response_time__avg"
+            ]
+            or 0
+        )
+        all_results.append(
+            {
+                "uptime_percentage": (interval_up_records / interval_total_records)
+                * 100
+                if interval_total_records
+                else 0,
+                "average_response_time": average_response_time,
+                "time_start": timezone.localtime(end_time).strftime("%b. %-d, %H:%M"),
+            }
+        )
+        total_records += interval_total_records
+        total_up_records += interval_up_records
+        total_avg_response_time.append(average_response_time)
+        start_time = end_time
+
+    total_avg_response_time = sum(total_avg_response_time) / len(
+        total_avg_response_time
+    )
+    uptime_percentage = (total_up_records / total_records) * 100 if total_records else 0
+
+    summary = {
+        "time_range": time_range,
+        "total_records": total_records,
+        "uptime_percentage": uptime_percentage,
+        "average_response_time": total_avg_response_time,
+        "time_start": timezone.localtime(now()).strftime("%b. %-d, %H:%M"),
+        "time_end": timezone.localtime(now()).strftime("%b. %-d, %H:%M"),
+    }
+    response = {
+        "summary": summary,
+        "data": all_results,
+    }
+    return response
diff --git a/apps/monitoring/tasks.py b/apps/monitoring/tasks.py
index 1ae0be8..b4798bd 100644
--- a/apps/monitoring/tasks.py
+++ b/apps/monitoring/tasks.py
@@ -1,7 +1,7 @@
 from celery import shared_task
-from .models import Service, UptimeRecord
+from apps.monitoring.models import Service, UptimeRecord
 from apps.notification.models import NotificationChannel, NotificationLog
-from .utils import check_service_status
+from apps.monitoring.utils import check_service_status
 
 
 # logger = get_task_logger(__nae__)
@@ -29,16 +29,21 @@ def check_monitor_services_status(service_id=None):
         error_message=error_message,
         service=service,
     )
-    # breakpoint()
+    if not Service.objects.filter(id=service_id).exists():
+        return
     if not is_up:
         message = f"Service {service.name} is down."
-        channels = NotificationChannel.objects.all()  # Example: Notify all channels
+        channels = Service.objects.get(id=service_id).notification_channel.all()
         for channel in channels:
             was_success = channel.send_notification(service, message)
             NotificationLog.objects.create(
                 service=service, message=message, was_success=was_success
             )
     else:
+        # check the last three records are up or not, if all up, do not send notification
+        records = UptimeRecord.objects.filter(service=service).order_by("-check_at")[:3]
+        if len(records) == 3 and all(record.status for record in records):
+            return
         message = f"Service {service.name} is up."
         channels = NotificationChannel.objects.all()  # Example: Notify all channels
         for channel in channels:
@@ -46,3 +51,8 @@ def check_monitor_services_status(service_id=None):
             NotificationLog.objects.create(
                 service=service, message=message, was_success=was_success
             )
+
+
+if __name__ == "__main__":
+    check_monitor_services_status(service_id=1)
+    print("check_monitor_services_status()")
diff --git a/apps/monitoring/views.py b/apps/monitoring/views.py
index a2ed5bc..2671b07 100644
--- a/apps/monitoring/views.py
+++ b/apps/monitoring/views.py
@@ -1,12 +1,19 @@
 from rest_framework import viewsets
 from django_celery_beat.models import IntervalSchedule, PeriodicTask
+from rest_framework.decorators import action
+from rest_framework.response import Response
 
-from .models import UptimeRecord
-from .serializers import (
+from apps.monitoring.models import UptimeRecord
+from apps.monitoring.serializers import (
     IntervalScheduleSerializer,
     PeriodicTaskSerializer,
     UptimeRecordSerializer,
 )
+from apps.monitoring.statistics import (
+    QUERY_TIME_RANGE_TYPE,
+    calculate_past_summary,
+    calculate_past_chart,
+)
 
 
 class IntervalScheduleViewSet(viewsets.ModelViewSet):
@@ -22,3 +29,37 @@ class PeriodicTaskViewSet(viewsets.ModelViewSet):
 class UptimeRecordViewSet(viewsets.ModelViewSet):
     queryset = UptimeRecord.objects.all()
     serializer_class = UptimeRecordSerializer
+
+    @action(detail=False, methods=["get"])
+    def stats(self, request):
+        # service_id = request.query_params.get("service_id")
+        time_range = int(request.query_params.get("time_range", 1))
+
+        # Apply time_range if specified and valid
+        if time_range not in QUERY_TIME_RANGE_TYPE:
+            return Response({"error": "Invalid time range"}, status=400)
+        (
+            total_records,
+            uptime_percentage,
+            average_response_time,
+        ) = calculate_past_summary(time_range=time_range)
+
+        data = {
+            "total_records": total_records,
+            "uptime_percentage": uptime_percentage,
+            "average_response_time": average_response_time,
+        }
+
+        return Response(data)
+
+    @action(detail=False, methods=["get"])
+    def chart(self, request):
+        time_range = int(request.query_params.get("time_range", 1))
+        split_interval = int(request.query_params.get("split_interval", 6))
+        if time_range not in QUERY_TIME_RANGE_TYPE:
+            return Response({"error": "Invalid time range"}, status=400)
+
+        data = calculate_past_chart(
+            time_range=time_range, split_interval=split_interval
+        )
+        return Response(data)
diff --git a/apps/notification/serializers.py b/apps/notification/serializers.py
index 04652a7..ec8cd31 100644
--- a/apps/notification/serializers.py
+++ b/apps/notification/serializers.py
@@ -1,9 +1,15 @@
+from pydantic_core import ValidationError
 from rest_framework import serializers
 
 from apps.notification.models import NotificationChannel, NotificationType
+from apps.notification.notify_services.bark import Bark
+from apps.notification.notify_services.telegram import Telegram
 
 
 class NotificationChannelSerializer(serializers.HyperlinkedModelSerializer):
+    type = serializers.ChoiceField(choices=NotificationType.choices)
+    url = serializers.URLField(required=False)
+
     class Meta:
         model = NotificationChannel
         fields = (
@@ -13,4 +19,34 @@ class Meta:
             "type",
             "url",
         )  # Explicitly include 'id' and other fields you need
-        type = serializers.ChoiceField(choices=NotificationType.choices)
+
+    def validate(self, attrs):
+        details = attrs.get("details")
+        channel_type = attrs.get("type")
+        match channel_type:
+            case NotificationType.TELEGRAM:
+                pydantic_model = Telegram
+            case NotificationType.BARK:
+                pydantic_model = Bark
+            case _:
+                pydantic_model = None
+
+        if pydantic_model:
+            try:
+                # Validates the details using the Pydantic model
+                pydantic_model(**details)
+            except ValidationError as e:
+                raise serializers.ValidationError({"details": e.errors()})
+
+        return attrs
+
+    def create(self, validated_data):
+        channel = NotificationChannel.objects.create(**validated_data)
+        return channel
+
+    def update(self, instance, validated_data):
+        instance.name = validated_data.get("name", instance.name)
+        instance.details = validated_data.get("details", instance.details)
+        instance.type = validated_data.get("type", instance.type)
+        instance.save()
+        return instance
diff --git a/apps/service/serializers.py b/apps/service/serializers.py
index 8a1efff..2498379 100644
--- a/apps/service/serializers.py
+++ b/apps/service/serializers.py
@@ -49,6 +49,7 @@ class ServiceSerializer(serializers.HyperlinkedModelSerializer):
     class Meta:
         model = Service
         fields = (
+            "id",
             "name",
             "description",
             "monitoring_endpoint",
@@ -67,23 +68,31 @@ class Meta:
     def create(self, validated_data):
         periodic_task_data = validated_data.pop("periodic_task_data", None)
         notification_channels_data = validated_data.pop("notification_channel", [])
-
+        interval_data = periodic_task_data.pop("interval", None)
         service = Service.objects.create(**validated_data)
 
         if notification_channels_data:
             service.notification_channel.set(notification_channels_data)
 
-        if periodic_task_data:
-            periodic_task_data["kwargs"] = json.dumps(
-                {"service_id": service.id}
-            )  # Update this line based on the task argument structure
-            periodic_task_serializer = PeriodicTaskSerializer(data=periodic_task_data)
-            if periodic_task_serializer.is_valid(raise_exception=True):
-                periodic_task = periodic_task_serializer.save()
-                service.periodic_task = (
-                    periodic_task  # Bind the PeriodicTask to the Service
-                )
-                service.save()
+        if not periodic_task_data or not interval_data:
+            raise ValueError(
+                "Invalid or missing 'periodic_task_data' for Service creation."
+            )
+        # create interval schedule
+        interval_serializer = IntervalScheduleSerializer(data=interval_data)
+        if not interval_serializer.is_valid(raise_exception=True):
+            raise ValueError("Invalid 'interval' data for PeriodicTask creation.")
+        # overwrite periodic_task_data kwargs with service id
+        periodic_task_data["kwargs"] = json.dumps({"service_id": service.id})
+        # create periodic task
+        periodic_task_data["interval"] = interval_data
+        periodic_task_serializer = PeriodicTaskSerializer(data=periodic_task_data)
+        if periodic_task_serializer.is_valid(raise_exception=True):
+            periodic_task = periodic_task_serializer.save()
+            service.periodic_task = (
+                periodic_task  # Bind the PeriodicTask to the Service
+            )
+            service.save()
 
         return service
 
diff --git a/docs/readme-img/design.excalidraw b/docs/readme-img/design.excalidraw
new file mode 100644
index 0000000..9b6960e
--- /dev/null
+++ b/docs/readme-img/design.excalidraw
@@ -0,0 +1,3124 @@
+{
+  "type": "excalidraw",
+  "version": 2,
+  "source": "https://excalidraw.com",
+  "elements": [
+    {
+      "type": "rectangle",
+      "version": 71,
+      "versionNonce": 820586357,
+      "isDeleted": false,
+      "id": "xE8GUTKYtZVZiybNWbOqT",
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+      "opacity": 100,
+      "angle": 0,
+      "x": 385.49006872538797,
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+      "strokeColor": "#1e1e1e",
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+      "width": 367.1235880938769,
+      "height": 191.86733679032722,
+      "seed": 1744552520,
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+      "locked": false,
+      "fontSize": 20,
+      "fontFamily": 2,
+      "text": "scope:\n    1 support system services (smb, shairport)\n    2. docker container monitoring\n    3. database monitoring \n    ",
+      "textAlign": "left",
+      "verticalAlign": "top",
+      "containerId": null,
+      "originalText": "scope:\n    1 support system services (smb, shairport)\n    2. docker container monitoring\n    3. database monitoring \n    ",
+      "lineHeight": 1.15
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+}
diff --git a/ping_server b/ping_server
new file mode 100755
index 0000000..925d565
Binary files /dev/null and b/ping_server differ
diff --git a/test/ping_server.go b/test/ping_server.go
new file mode 100644
index 0000000..5047e18
--- /dev/null
+++ b/test/ping_server.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+   "fmt"
+   "net/http"
+    "time"
+)
+var pong = make(chan int)
+
+func ping(w http.ResponseWriter, req *http.Request,){
+    fmt.Fprintf(w,"pong")
+    pong <- 1
+}
+
+func main() {
+    fmt.Println("you can ping at http://localhost:8090/ping")
+    http.HandleFunc("/ping",ping)
+    go func(){
+    for range pong {
+        fmt.Println("pong",time.Now())
+        }
+    }()
+    http.ListenAndServe(":8090", nil)
+}
diff --git a/test/test_monitering.py b/test/test_monitering.py
index 10c3224..f1a7abd 100644
--- a/test/test_monitering.py
+++ b/test/test_monitering.py
@@ -1,8 +1,17 @@
 import pytest
+from dj_rest_auth.tests.mixins import APIClient
+from rest_framework import status
 from rest_framework.exceptions import ErrorDetail
 
+from apps.monitoring.models import UptimeRecord
 from apps.monitoring.serializers import PeriodicTaskSerializer
 from apps.notification.models import NotificationChannel, NotificationType
+from apps.service.models import Service
+
+
+@pytest.fixture
+def api_client():
+    return APIClient()
 
 
 # Setup a fixture for the notification channel that can be used across multiple tests
@@ -15,6 +24,25 @@ def notification_channel(db):
     )
 
 
+@pytest.fixture
+def test_service(db):
+    return Service.objects.create(
+        name="Test Service",
+        description="A test service.",
+        monitoring_endpoint="http://127.0.0.1",
+        is_active=True,
+    )
+
+
+@pytest.fixture
+def test_uptime_record(db, test_service):
+    return UptimeRecord.objects.create(
+        service=test_service,
+        status=True,
+        response_time=100.0,
+    )
+
+
 @pytest.mark.django_db
 def test_create_valid_periodic_task_data(notification_channel):
     """Test service creation with valid periodic_task data."""
@@ -86,3 +114,66 @@ def test_create_invalid_periodic_task_data_missing_interval(notification_channel
     assert serializer.errors == {
         "interval": [ErrorDetail(string="This field is required.", code="required")]
     }
+
+
+def test_create_valid_uptime_record(test_uptime_record):
+    """Test uptime record creation with valid data."""
+    assert test_uptime_record.status
+    assert test_uptime_record.response_time == 100.0
+    assert test_uptime_record.error_message is None
+
+
+def test_uptime_record_list(api_client, test_uptime_record):
+    """
+    Test fetching the list of uptime records.
+    """
+    response = api_client.get("/uptime/")
+    assert response.status_code == status.HTTP_200_OK
+    assert len(response.data) > 0
+
+
+def test_filter_uptime_records_by_service(api_client, test_service, test_uptime_record):
+    """
+    Test filtering uptime records by service.
+    """
+    response = api_client.get(f"/uptime/?service_id={test_service.id}")
+    assert response.status_code == status.HTTP_200_OK
+    assert len(response.data) == 1
+    assert response.data[0]["service"] == test_service.id
+
+
+def test_uptime_record_creation(api_client, test_service):
+    """
+    Test creating a new uptime record.
+    """
+    response = api_client.post(
+        "/uptime/",
+        {
+            "service": test_service.id,
+            "status": True,
+            "response_time": 50.0,
+        },
+    )
+
+    response = api_client.post(
+        "/uptime/",
+        {
+            "service": test_service.id,
+            "status": True,
+            "response_time": 150.0,
+        },
+    )
+    assert response.status_code == status.HTTP_201_CREATED
+    assert UptimeRecord.objects.count() == 2
+    assert UptimeRecord.objects.first().service == test_service
+    response = api_client.get(f"/uptime/?service_id={test_service.id}")
+    assert response.status_code == status.HTTP_200_OK
+    assert len(response.data) == 2
+    assert response.data[0]["service"] == test_service.id
+    #     / uptime / stats /?service_id = 17
+
+    response = api_client.get(f"/uptime/stats/?service_id={test_service.id}")
+    assert response.status_code == status.HTTP_200_OK
+    assert response.data["total_records"] == 2
+    assert response.data["uptime_percentage"] == 100.0
+    assert response.data["average_response_time"] == 100.0
diff --git a/test/test_notification.py b/test/test_notification.py
index e69de29..fcd31ca 100644
--- a/test/test_notification.py
+++ b/test/test_notification.py
@@ -0,0 +1,64 @@
+import pytest
+from rest_framework.exceptions import ValidationError
+from apps.notification.serializers import NotificationChannelSerializer
+
+
+@pytest.fixture
+def valid_telegram_data():
+    return {
+        "name": "Test Channel",
+        "details": {"token": "test_token", "chat_id": "test_chat_id"},
+        "type": "telegram",
+        "url": "http://example.com",
+    }
+
+
+@pytest.fixture
+def valid_bark_data():
+    return {
+        "name": "Test Channel bark",
+        "details": {
+            "bark-endpoint": "http://example.com",
+        },
+        "type": "bark",
+        "url": "http://example.com",
+    }
+
+
+@pytest.mark.django_db
+def test_notification_channel_serializer_with_valid_data(
+    valid_bark_data,
+):
+    serializer = NotificationChannelSerializer(data=valid_bark_data)
+    assert serializer.is_valid(), serializer.errors
+
+
+@pytest.mark.django_db
+def test_notification_channel_serializer_with_invalid_data(
+    valid_bark_data,
+):
+    # Change the data to make it invalid
+    valid_bark_data["type"] = "INVALID_TYPE"
+    serializer = NotificationChannelSerializer(data=valid_bark_data)
+    with pytest.raises(ValidationError):
+        assert serializer.is_valid(raise_exception=True)
+
+
+@pytest.mark.django_db
+def test_notification_channel_serializer_with_invalid_detail():
+    # Change the data to make it invalid
+    valid_bark_data = {
+        "name": "Test Channel bark",
+        "details": {
+            "NOT-REAL-bark-endpoint": "http://example.com",
+        },
+        "type": "bark",
+        "url": "http://example.com",
+    }
+    serializer = NotificationChannelSerializer(data=valid_bark_data)
+    with pytest.raises(ValidationError):
+        assert serializer.is_valid(raise_exception=True)
+
+    serializer = NotificationChannelSerializer(data=valid_bark_data)
+    assert not serializer.is_valid()
+    assert "(string='bark-endpoint'" in str(serializer.errors)
diff --git a/test/test_service.py b/test/test_service.py
index 18d6ae7..36e28af 100644
--- a/test/test_service.py
+++ b/test/test_service.py
@@ -71,6 +71,10 @@ def test_create_service_with_periodic_task_data(periodic_task_data):
     service = serializer.save()
     assert service.periodic_task is not None
     assert service.periodic_task.name == "Test Task"
+    assert (
+        service.periodic_task.interval.every == 10
+    ), service.periodic_task.interval.every
+    assert service.periodic_task.interval.period == "seconds"
 
 
 @pytest.mark.django_db
diff --git a/test/test_tasks.py b/test/test_tasks.py
new file mode 100644
index 0000000..de5552b
--- /dev/null
+++ b/test/test_tasks.py
@@ -0,0 +1,51 @@
+import pytest
+
+from apps.notification.models import NotificationChannel, NotificationType
+from apps.service.serializers import ServiceSerializer
+
+
+# Setup a fixture for the notification channel that can be used across multiple tests
+@pytest.fixture
+def notification_channel(db):
+    return NotificationChannel.objects.create(
+        name="Test Channel",
+        type=NotificationType.BARK,
+        details={"url": "https://bark.example.com"},
+    )
+
+
+# Setup a fixture for the periodic task data
+@pytest.fixture
+def periodic_task_data():
+    return {
+        "name": "Test Task",
+        "task": "apps.monitoring.tasks.check_monitor_services_status",
+        # "kwargs": {},
+        "interval": {
+            "every": 10,
+            "period": "seconds",
+        },
+        "enabled": True,
+    }
+
+
+@pytest.mark.django_db
+def test_create_service_with_notification_id(notification_channel, periodic_task_data):
+    """Test service creation with a_notification_id."""
+    data = {
+        "name": "brruno",
+        "description": "test",
+        "monitoring_endpoint": "http://localhost:8000/service/",
+        "is_active": True,
+        "notification_channel": [notification_channel.id],
+        "monitoring_type": "http",
+        "periodic_task_data": periodic_task_data,
+    }
+
+    assert isinstance(
+        notification_channel.id, int
+    ), "Notification channel id is not an integer"
+    serializer = ServiceSerializer(data=data)
+    assert serializer.is_valid(), serializer.errors
+    service = serializer.save()
+    assert service.notification_channel.first().id == notification_channel.id
diff --git a/uptimemonitor/settings.py b/uptimemonitor/settings.py
index eb2793e..24f3117 100644
--- a/uptimemonitor/settings.py
+++ b/uptimemonitor/settings.py
@@ -159,7 +159,7 @@
 REST_SESSION_LOGIN = False
 
 
-CELERY_TIMEZONE = "UTC"
+CELERY_TIMEZONE = "Europe/London"
 CELERY_TASK_TRACK_STARTED = True
 CELERY_TASK_TIME_LIMIT = 30 * 60