diff --git a/server/src/controllers/analytics_controller.ts b/server/src/controllers/analytics_controller.ts
index 8bff203..b82f7e5 100644
--- a/server/src/controllers/analytics_controller.ts
+++ b/server/src/controllers/analytics_controller.ts
@@ -305,15 +305,16 @@ async function processDetectionResult(analyticUnitId: AnalyticUnit.AnalyticUnitI
       `Missing lastDetectionTime in result or it is corrupted: ${JSON.stringify(detectionResult)}`
     );
   }
-  console.debug(`got detection result with ${detectionResult.segments.length} segments`);
+  console.debug(`got detection result for ${analyticUnitId} with ${detectionResult.segments.length} segments`);
 
-  const segments = detectionResult.segments.map(
+  const sortedSegments: {from, to}[] = _.sortBy(detectionResult.segments, 'from');
+  const segments = sortedSegments.map(
     segment => new Segment.Segment(analyticUnitId, segment.from, segment.to, false, false)
   );
   const analyticUnit = await AnalyticUnit.findById(analyticUnitId);
   if (!_.isEmpty(segments) && analyticUnit.alert) {
     try {
-      alertService.recieveAlert(analyticUnit, _.last(segments));
+      alertService.receiveAlert(analyticUnit, _.last(segments));
     } catch(err) {
       console.error(`error while sending webhook: ${err.message}`);
     }
diff --git a/server/src/services/alert_service.ts b/server/src/services/alert_service.ts
index 73da7cd..bae8269 100644
--- a/server/src/services/alert_service.ts
+++ b/server/src/services/alert_service.ts
@@ -6,36 +6,52 @@ import { Segment } from '../models/segment_model';
 
 
 export class Alert {
-  constructor(protected analyticUnit: AnalyticUnit.AnalyticUnit, protected sender) {};
-  public recieve(segment: Segment) {
-    this.sender(this.analyticUnit, segment);
+  public enabled = true;
+  constructor(protected analyticUnit: AnalyticUnit.AnalyticUnit) {};
+  public receive(segment: Segment) {
+    if(this.enabled) {
+      sendWebhook(this.analyticUnit.name, segment);
+    }
   };
-  public update(now: number) {};
 }
 
-class PatternAlert extends Alert {};
+class PatternAlert extends Alert {
+
+  private lastSentSegment: Segment;
+
+  public receive(segment: Segment) {
+    if(this.lastSentSegment === undefined || !segment.equals(this.lastSentSegment) ) {
+      this.lastSentSegment = segment;
+      if(this.enabled) {
+        sendWebhook(this.analyticUnit.name, segment);
+      }
+    }
+  }
+};
 
 
 class ThresholdAlert extends Alert {
   EXPIRE_PERIOD_MS = 60000;
   lastOccurence = 0;
 
-  public recieve(segment: Segment) {
+  public receive(segment: Segment) {
     if(this.lastOccurence === 0) {
       this.lastOccurence = segment.from;
-      this.sender(this.analyticUnit, segment);
+      if(this.enabled) {
+        sendWebhook(this.analyticUnit.name, segment);
+      }
     } else {
 
       if(segment.from - this.lastOccurence > this.EXPIRE_PERIOD_MS) {
-        console.debug(`difference detween threshold occurences ${segment.from - this.lastOccurence}, send alert`);
-        this.sender(this.analyticUnit, segment);
+        if(this.enabled) {
+          console.debug(`time between threshold occurences ${segment.from - this.lastOccurence}ms, send alert`);
+          sendWebhook(this.analyticUnit.name, segment);
+        }
       }
 
       this.lastOccurence = segment.from;
     }
   }
-
-  public update(now: number) {}
 }
 
 
@@ -43,26 +59,23 @@ export class AlertService {
 
   private _alerts: { [id: string]: Alert; };
   private _alertingEnable: boolean;
-  private _sender: any;
 
   constructor() {
     this._alerts = {}
-    this._alertingEnable = false;
-    this._sender = (analyticUnit: AnalyticUnit.AnalyticUnit, segment: Segment) => {
-      if(this._alertingEnable) {
-        sendWebhook(analyticUnit.name, segment);
-      }
-    }
   }
 
-  public recieveAlert(analyticUnit: AnalyticUnit.AnalyticUnit, segment: Segment) {
+  public receiveAlert(analyticUnit: AnalyticUnit.AnalyticUnit, segment: Segment) {
+    if(!this._alertingEnable) {
+      return;
+    }
+
     let id = analyticUnit.id;
 
     if(!_.has(this._alerts, id)) {
       this.addAnalyticUnit(analyticUnit);
     }
 
-    this._alerts[id].recieve(segment);
+    this._alerts[id].receive(segment);
   };
 
   public addAnalyticUnit(analyticUnit: AnalyticUnit.AnalyticUnit) {
@@ -72,7 +85,7 @@ export class AlertService {
     alertsType[AnalyticUnit.DetectorType.THRESHOLD] = ThresholdAlert;
     alertsType[AnalyticUnit.DetectorType.PATTERN] = PatternAlert;
 
-    this._alerts[analyticUnit.id] = new alertsType[detector](analyticUnit, this._sender);
+    this._alerts[analyticUnit.id] = new alertsType[detector](analyticUnit);
   }
 
   public removeAnalyticUnit(analyticUnitId: AnalyticUnit.AnalyticUnitId) {
diff --git a/server/src/services/data_puller.ts b/server/src/services/data_puller.ts
index 3e20eed..c8df31d 100644
--- a/server/src/services/data_puller.ts
+++ b/server/src/services/data_puller.ts
@@ -56,7 +56,9 @@ export class DataPuller {
 
     try {
       this.analyticsService.sendTask(task);
-      console.log(`data puller successfuly pushed ${data.data.length} points for unit id: ${unit.id}`);
+      let fromTime = new Date(data.from).toLocaleTimeString();
+      let toTime = new Date(data.to).toLocaleTimeString();
+      console.log(`pushed ${data.data.length} points to unit: ${unit.id} ${fromTime}-${toTime}`);
     } catch(e) {
       console.log(`data puller got error while push data ${e.message}`);
     }
@@ -109,14 +111,14 @@ export class DataPuller {
       const detector = AnalyticUnit.getDetectorByType(analyticUnit.type);
       let payload = {
         data: payloadValues,
-        from: time,
+        from: this._unitTimes[analyticUnit.id],
         to: now,
         analyticUnitType: analyticUnit.type,
         detector,
         cache
       };
-      this._unitTimes[analyticUnit.id] = now;
       this.pushData(analyticUnit, payload);
+      this._unitTimes[analyticUnit.id] = now;
     }
   }
 
diff --git a/server/src/services/notification_service.ts b/server/src/services/notification_service.ts
index 6bdbae4..0ac6fd4 100644
--- a/server/src/services/notification_service.ts
+++ b/server/src/services/notification_service.ts
@@ -13,7 +13,9 @@ export async function sendWebhook(analyticUnitName: string, segment: Segment) {
     to: segment.to 
   };
 
-  console.log(`Sending alert name:${alert.analyticUnitName} from:${new Date(alert.from)} to:${new Date(alert.to)}`);
+  const fromTime = new Date(alert.from).toLocaleTimeString();
+  const toTime = new Date(alert.to).toLocaleTimeString();
+  console.log(`Sending alert unit:${alert.analyticUnitName} from: ${fromTime} to: ${toTime}`);
 
   if(HASTIC_WEBHOOK_URL === null) {
     throw new Error(`Can't send alert, HASTIC_WEBHOOK_URL is undefined`);