diff --git a/analytics/analytics/analytic_types/detector_typing.py b/analytics/analytics/analytic_types/detector_typing.py
index 39bc689..b339035 100644
--- a/analytics/analytics/analytic_types/detector_typing.py
+++ b/analytics/analytics/analytic_types/detector_typing.py
@@ -1,16 +1,29 @@
-import utils.meta
 from analytic_types import ModelCache
+from analytic_types.segment import Segment
+
+from typing import List, Optional
 
 
-@utils.meta.JSONClass
 class DetectionResult:
 
     def __init__(
         self,
-        cache: ModelCache = ModelCache(),
-        segments: list = [],
+        cache: Optional[ModelCache] = None,
+        segments: Optional[List[Segment]] = None,
         last_detection_time: int = None
     ):
+        if cache is None:
+            cache = {}
+        if segments is None:
+            segments = []
         self.cache = cache
         self.segments = segments
         self.last_detection_time = last_detection_time
+
+    # TODO: use @utils.meta.JSONClass (now it can't serialize list of objects)
+    def to_json(self):
+        return {
+            'cache': self.cache,
+            'segments': list(map(lambda segment: segment.to_json(), self.segments)),
+            'lastDetectionTime': self.last_detection_time
+        }
diff --git a/analytics/analytics/analytic_types/segment.py b/analytics/analytics/analytic_types/segment.py
new file mode 100644
index 0000000..516b888
--- /dev/null
+++ b/analytics/analytics/analytic_types/segment.py
@@ -0,0 +1,18 @@
+from typing import Optional
+
+class Segment:
+    '''
+    Used for segment manipulation instead of { 'from': ..., 'to': ... } dict
+    '''
+
+    def __init__(self, from_timestamp: int, to_timestamp: int):
+        if to_timestamp < from_timestamp:
+            raise ValueError(f'Can`t create segment with to < from: {to_timestamp} < {from_timestamp}')
+        self.from_timestamp = from_timestamp
+        self.to_timestamp = to_timestamp
+
+    def to_json(self):
+        return {
+            'from': self.from_timestamp,
+            'to': self.to_timestamp
+        }
diff --git a/analytics/analytics/analytic_unit_worker.py b/analytics/analytics/analytic_unit_worker.py
index c3f9636..f0e838d 100644
--- a/analytics/analytics/analytic_unit_worker.py
+++ b/analytics/analytics/analytic_unit_worker.py
@@ -59,7 +59,7 @@ class AnalyticUnitWorker:
             chunk_dataframe = prepare_data(chunk)
             detected = self._detector.detect(chunk_dataframe, cache)
             self.__append_detection_result(detection_result, detected)
-        detection_result.segments = self._detector.get_intersections(detection_result.segments)
+        detection_result.segments = self._detector.merge_segments(detection_result.segments)
         return detection_result.to_json()
 
     def cancel(self):
@@ -77,7 +77,7 @@ class AnalyticUnitWorker:
             detected = self._detector.consume_data(chunk_dataframe, cache)
             self.__append_detection_result(detection_result, detected)
         
-        detection_result.segments = self._detector.get_intersections(detection_result.segments)
+        detection_result.segments = self._detector.merge_segments(detection_result.segments)
 
         if detection_result.last_detection_time is None:
             return None
@@ -85,7 +85,7 @@ class AnalyticUnitWorker:
             return detection_result.to_json()
 
     # TODO: move result concatenation to Detectors
-    def __append_detection_result(self, detection_result: DetectionResult, new_chunk: dict):
+    def __append_detection_result(self, detection_result: DetectionResult, new_chunk: DetectionResult):
         if new_chunk is not None:
             detection_result.cache = new_chunk.cache
             detection_result.last_detection_time = new_chunk.last_detection_time
diff --git a/analytics/analytics/detectors/anomaly_detector.py b/analytics/analytics/detectors/anomaly_detector.py
index 79f8df2..1c7f7bf 100644
--- a/analytics/analytics/detectors/anomaly_detector.py
+++ b/analytics/analytics/detectors/anomaly_detector.py
@@ -5,6 +5,7 @@ from typing import Optional, Union, List, Tuple
 from analytic_types import AnalyticUnitId, ModelCache
 from analytic_types.detector_typing import DetectionResult
 from analytic_types.data_bucket import DataBucket
+from analytic_types.segment import Segment
 from detectors import Detector
 import utils
 
@@ -40,9 +41,10 @@ class AnomalyDetector(Detector):
         for idx, val in enumerate(data.values):
             if val > upper_bound.values[idx] or val < lower_bound.values[idx]:
                 anomaly_indexes.append(data.index[idx])
+        # TODO: use Segment in utils
         segments = utils.close_filtering(anomaly_indexes, 1)
         segments = utils.get_start_and_end_of_segments(segments)
-        segments = [(
+        segments = [Segment(
             utils.convert_pd_timestamp_to_ms(dataframe['timestamp'][segment[0]]),
             utils.convert_pd_timestamp_to_ms(dataframe['timestamp'][segment[1]]),
         ) for segment in segments]
@@ -67,8 +69,6 @@ class AnomalyDetector(Detector):
                 break
         return level
 
-    def get_intersections(self, segments: List[dict]) -> List[dict]:
-        segments = [[segment['from'], segment['to']] for segment in segments]
-        segments = utils.merge_intersecting_intervals(segments)
-        segments = [{'from': segment[0], 'to': segment[1]} for segment in segments]
+    def merge_segments(self, segments: List[Segment]) -> List[Segment]:
+        segments = utils.merge_intersecting_segments(segments)
         return segments
diff --git a/analytics/analytics/detectors/detector.py b/analytics/analytics/detectors/detector.py
index 2232d70..82034a9 100644
--- a/analytics/analytics/detectors/detector.py
+++ b/analytics/analytics/detectors/detector.py
@@ -4,6 +4,7 @@ from typing import Optional, Union, List
 
 from analytic_types import ModelCache
 from analytic_types.detector_typing import DetectionResult
+from analytic_types.segment import Segment
 
 
 class Detector(ABC):
@@ -27,6 +28,5 @@ class Detector(ABC):
     def get_window_size(self, cache: Optional[ModelCache]) -> int:
         pass
 
-    @abstractmethod
-    def get_intersections(self, segments: List[dict]) -> List[dict]:
-        pass
+    def merge_segments(self, segments: List[Segment]) -> List[Segment]:
+        return segments
diff --git a/analytics/analytics/detectors/pattern_detector.py b/analytics/analytics/detectors/pattern_detector.py
index 65d4cfe..406e075 100644
--- a/analytics/analytics/detectors/pattern_detector.py
+++ b/analytics/analytics/detectors/pattern_detector.py
@@ -12,6 +12,7 @@ from analytic_types.data_bucket import DataBucket
 from utils import convert_pd_timestamp_to_ms
 from analytic_types import AnalyticUnitId, ModelCache
 from analytic_types.detector_typing import DetectionResult
+from analytic_types.segment import Segment
 
 
 logger = logging.getLogger('PATTERN_DETECTOR')
@@ -78,7 +79,7 @@ class PatternDetector(Detector):
 
         detected = self.model.detect(dataframe, self.analytic_unit_id)
 
-        segments = [{ 'from': segment[0], 'to': segment[1] } for segment in detected['segments']]
+        segments = [Segment(segment[0], segment[1]) for segment in detected['segments']]
         new_cache = detected['cache'].to_json()
         last_dataframe_time = dataframe.iloc[-1]['timestamp']
         last_detection_time = convert_pd_timestamp_to_ms(last_dataframe_time)
@@ -123,7 +124,6 @@ class PatternDetector(Detector):
 
     def get_window_size(self, cache: Optional[ModelCache]) -> int:
         if cache is None: return self.DEFAULT_WINDOW_SIZE
+        # TODO: windowSize -> window_size
         return cache.get('windowSize', self.DEFAULT_WINDOW_SIZE)
 
-    def get_intersections(self, segments: List[dict]) -> List[dict]:
-        return segments
diff --git a/analytics/analytics/detectors/threshold_detector.py b/analytics/analytics/detectors/threshold_detector.py
index c8ad572..186ffa0 100644
--- a/analytics/analytics/detectors/threshold_detector.py
+++ b/analytics/analytics/detectors/threshold_detector.py
@@ -6,6 +6,7 @@ from typing import Optional, List
 
 from analytic_types import ModelCache
 from analytic_types.detector_typing import DetectionResult
+from analytic_types.segment import Segment
 from detectors import Detector
 from time import time
 from utils import convert_sec_to_ms, convert_pd_timestamp_to_ms
@@ -40,17 +41,16 @@ class ThresholdDetector(Detector):
 
         segments = []
         for index, row in dataframe.iterrows():
+            current_value = row['value']
             current_timestamp = convert_pd_timestamp_to_ms(row['timestamp'])
-            segment = { 'from': current_timestamp, 'to': current_timestamp }
+            segment = Segment(current_timestamp, current_timestamp)
+
             # TODO: merge segments
-            if pd.isnull(row['value']):
+            if pd.isnull(current_value):
                 if condition == 'NO_DATA':
-                    segment['params'] = { value: None }
                     segments.append(segment)
                 continue
 
-            current_value = row['value']
-            segment['params'] = { value: row['value'] }
             if condition == '>':
                 if current_value > value:
                     segments.append(segment)
@@ -78,6 +78,3 @@ class ThresholdDetector(Detector):
 
     def get_window_size(self, cache: Optional[ModelCache]) -> int:
         return self.WINDOW_SIZE
-
-    def get_intersections(self, segments: List[dict]) -> List[dict]:
-        return segments
diff --git a/analytics/analytics/models/__init__.py b/analytics/analytics/models/__init__.py
index 2acf839..646427e 100644
--- a/analytics/analytics/models/__init__.py
+++ b/analytics/analytics/models/__init__.py
@@ -1,4 +1,4 @@
-from models.model import Model, ModelState
+from models.model import Model, ModelState, AnalyticSegment
 from models.drop_model import DropModel, DropModelState
 from models.peak_model import PeakModel, PeakModelState
 from models.jump_model import JumpModel, JumpModelState
diff --git a/analytics/analytics/models/custom_model.py b/analytics/analytics/models/custom_model.py
index 20f7852..ab7a856 100644
--- a/analytics/analytics/models/custom_model.py
+++ b/analytics/analytics/models/custom_model.py
@@ -1,10 +1,17 @@
-from models import Model
+from models import Model, AnalyticSegment
 import utils
 import pandas as pd
+from typing import List
 
 
 class CustomModel(Model):
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: list, deleted_segments: list) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         pass
 
     def do_detect(self, dataframe: pd.DataFrame) -> list:
diff --git a/analytics/analytics/models/drop_model.py b/analytics/analytics/models/drop_model.py
index 2720690..3053d8e 100644
--- a/analytics/analytics/models/drop_model.py
+++ b/analytics/analytics/models/drop_model.py
@@ -1,4 +1,4 @@
-from models import Model, ModelState
+from models import Model, ModelState, AnalyticSegment
 
 import scipy.signal
 from scipy.fftpack import fft
@@ -43,7 +43,13 @@ class DropModel(Model):
     def get_state(self, cache: Optional[dict] = None) -> DropModelState:
         return DropModelState.from_json(cache)
 
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         data = utils.cut_dataframe(dataframe)
         data = data['value']
         window_size = self.state.window_size
diff --git a/analytics/analytics/models/general_model.py b/analytics/analytics/models/general_model.py
index 421be58..d2911bd 100644
--- a/analytics/analytics/models/general_model.py
+++ b/analytics/analytics/models/general_model.py
@@ -1,5 +1,5 @@
 from analytic_types import AnalyticUnitId
-from models import Model, ModelState
+from models import Model, ModelState, AnalyticSegment
 from typing import Union, List, Generator
 import utils
 import utils.meta
@@ -43,7 +43,13 @@ class GeneralModel(Model):
     def get_state(self, cache: Optional[dict] = None) -> GeneralModelState:
         return GeneralModelState.from_json(cache)
 
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         data = utils.cut_dataframe(dataframe)
         data = data['value']
         last_pattern_center = self.state.pattern_center
diff --git a/analytics/analytics/models/jump_model.py b/analytics/analytics/models/jump_model.py
index 77035e2..7a6b056 100644
--- a/analytics/analytics/models/jump_model.py
+++ b/analytics/analytics/models/jump_model.py
@@ -1,4 +1,4 @@
-from models import Model, ModelState
+from models import Model, ModelState, AnalyticSegment
 
 import utils
 import utils.meta
@@ -44,7 +44,13 @@ class JumpModel(Model):
     def get_state(self, cache: Optional[dict] = None) -> JumpModelState:
         return JumpModelState.from_json(cache)
 
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         data = utils.cut_dataframe(dataframe)
         data = data['value']
         window_size = self.state.window_size
diff --git a/analytics/analytics/models/model.py b/analytics/analytics/models/model.py
index 071288e..e72bf31 100644
--- a/analytics/analytics/models/model.py
+++ b/analytics/analytics/models/model.py
@@ -6,30 +6,50 @@ from typing import Optional, List, Tuple
 import pandas as pd
 import math
 import logging
-from analytic_types import AnalyticUnitId
+from analytic_types import AnalyticUnitId, ModelCache
+from analytic_types.segment import Segment
 
 import utils.meta
 
-class Segment(AttrDict):
+class AnalyticSegment(Segment):
+    '''
+    Segment with specific analytics fields used by models:
+    - `labeled` / `deleted` flags
+    - `from` / `to` / `center` indices
+    - `length`
+    - `data`
+    - etc
+    '''
 
-    def __init__(self, dataframe: pd.DataFrame, segment_map: dict, center_finder = None):
-        self.update(segment_map)
-        self.start = utils.timestamp_to_index(dataframe, pd.to_datetime(self['from'], unit='ms'))
-        self.end = utils.timestamp_to_index(dataframe, pd.to_datetime(self['to'], unit='ms'))
-        self.length = abs(self.end - self.start)
+    def __init__(
+        self,
+        from_timestamp: int,
+        to_timestamp: int,
+        labeled: bool,
+        deleted: bool,
+        dataframe: pd.DataFrame,
+        center_finder = None
+    ):
+        super().__init__(from_timestamp, to_timestamp)
+        self.labeled = labeled
+        self.deleted = deleted
+
+        self.from_index = utils.timestamp_to_index(dataframe, pd.to_datetime(self.from_timestamp, unit='ms'))
+        self.to_index = utils.timestamp_to_index(dataframe, pd.to_datetime(self.to_timestamp, unit='ms'))
+        self.length = abs(self.to_index - self.from_index)
         self.__percent_of_nans = 0
 
         if callable(center_finder):
-            self.center_index = center_finder(dataframe, self.start, self.end)
+            self.center_index = center_finder(dataframe, self.from_index, self.to_index)
             self.pattern_timestamp = dataframe['timestamp'][self.center_index]
         else:
-            self.center_index = self.start + math.ceil(self.length / 2)
+            self.center_index = self.from_index + math.ceil(self.length / 2)
             self.pattern_timestamp = dataframe['timestamp'][self.center_index]
 
-        assert len(dataframe['value']) >= self.end + 1, \
-            'segment {}-{} out of dataframe length={}'.format(self.start, self.end+1, len(dataframe['value']))
+        assert len(dataframe['value']) >= self.to_index + 1, \
+            'segment {}-{} out of dataframe length={}'.format(self.from_index, self.to_index + 1, len(dataframe['value']))
 
-        self.data = dataframe['value'][self.start: self.end + 1]
+        self.data = dataframe['value'][self.from_index: self.to_index + 1]
 
     @property
     def percent_of_nans(self):
@@ -71,7 +91,13 @@ class Model(ABC):
     DEL_CONV_ERROR = 0.02
 
     @abstractmethod
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         pass
 
     @abstractmethod
@@ -87,7 +113,7 @@ class Model(ABC):
         pass
 
     @abstractmethod
-    def get_state(self, cache: Optional[dict] = None) -> ModelState:
+    def get_state(self, cache: Optional[ModelCache] = None) -> ModelState:
         pass
 
     def fit(self, dataframe: pd.DataFrame, segments: List[dict], id: AnalyticUnitId) -> ModelState:
@@ -98,9 +124,16 @@ class Model(ABC):
         deleted = []
         for segment_map in segments:
             if segment_map['labeled'] or segment_map['deleted']:
-                segment = Segment(dataframe, segment_map, self.find_segment_center)
+                segment = AnalyticSegment(
+                    segment_map['from'],
+                    segment_map['to'],
+                    segment_map['labeled'],
+                    segment_map['deleted'],
+                    dataframe,
+                    self.find_segment_center
+                )
                 if segment.percent_of_nans > 0.1 or len(segment.data) == 0:
-                    logging.debug(f'segment {segment.start}-{segment.end} skip because of invalid data')
+                    logging.debug(f'segment {segment.from_index}-{segment.to_index} skip because of invalid data')
                     continue
                 if segment.percent_of_nans > 0:
                     segment.convert_nan_to_zero()
@@ -113,6 +146,7 @@ class Model(ABC):
         if self.state.window_size == 0:
             self.state.window_size = math.ceil(max_length / 2) if max_length else 0
         model, model_type = self.get_model_type()
+        # TODO: learning_info: dict -> class
         learning_info = self.get_parameters_from_segments(dataframe, labeled, deleted, model, model_type)
         self.do_fit(dataframe, labeled, deleted, learning_info)
         logging.debug('fit complete successful with self.state: {} for analytic unit: {}'.format(self.state, id))
@@ -169,7 +203,7 @@ class Model(ABC):
                 learning_info['pattern_height'].append(utils.find_confidence(aligned_segment)[1])
                 learning_info['patterns_value'].append(aligned_segment.values.max())
             if model == 'jump' or model == 'drop':
-                pattern_height, pattern_length = utils.find_parameters(segment.data, segment.start, model)
+                pattern_height, pattern_length = utils.find_parameters(segment.data, segment.from_index, model)
                 learning_info['pattern_height'].append(pattern_height)
                 learning_info['pattern_width'].append(pattern_length)
                 learning_info['patterns_value'].append(aligned_segment.values[self.state.window_size])
diff --git a/analytics/analytics/models/peak_model.py b/analytics/analytics/models/peak_model.py
index 53ac3f1..2f993bf 100644
--- a/analytics/analytics/models/peak_model.py
+++ b/analytics/analytics/models/peak_model.py
@@ -1,4 +1,4 @@
-from models import Model, ModelState
+from models import Model, ModelState, AnalyticSegment
 
 import scipy.signal
 from scipy.fftpack import fft
@@ -45,7 +45,13 @@ class PeakModel(Model):
     def get_state(self, cache: Optional[dict] = None) -> PeakModelState:
         return PeakModelState.from_json(cache)
 
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         data = utils.cut_dataframe(dataframe)
         data = data['value']
         window_size = self.state.window_size
diff --git a/analytics/analytics/models/trough_model.py b/analytics/analytics/models/trough_model.py
index 5b0fc3c..47838b7 100644
--- a/analytics/analytics/models/trough_model.py
+++ b/analytics/analytics/models/trough_model.py
@@ -1,4 +1,4 @@
-from models import Model, ModelState
+from models import Model, ModelState, AnalyticSegment
 
 import scipy.signal
 from scipy.fftpack import fft
@@ -45,7 +45,13 @@ class TroughModel(Model):
     def get_state(self, cache: Optional[dict] = None) -> TroughModelState:
         return TroughModelState.from_json(cache)
 
-    def do_fit(self, dataframe: pd.DataFrame, labeled_segments: List[dict], deleted_segments: List[dict], learning_info: dict) -> None:
+    def do_fit(
+        self,
+        dataframe: pd.DataFrame,
+        labeled_segments: List[AnalyticSegment],
+        deleted_segments: List[AnalyticSegment],
+        learning_info: dict
+    ) -> None:
         data = utils.cut_dataframe(dataframe)
         data = data['value']
         window_size = self.state.window_size
diff --git a/analytics/analytics/utils/__init__.py b/analytics/analytics/utils/__init__.py
index 851cfdd..d2c3555 100644
--- a/analytics/analytics/utils/__init__.py
+++ b/analytics/analytics/utils/__init__.py
@@ -1,4 +1,3 @@
 from utils.common import *
-from utils.segments import *
 from utils.time import *
 from utils.dataframe import *
diff --git a/analytics/analytics/utils/common.py b/analytics/analytics/utils/common.py
index 06bacff..1278035 100644
--- a/analytics/analytics/utils/common.py
+++ b/analytics/analytics/utils/common.py
@@ -11,6 +11,7 @@ import utils
 import logging
 from itertools import islice
 from collections import deque
+from analytic_types.segment import Segment
 
 SHIFT_FACTOR = 0.05
 CONFIDENCE_FACTOR = 0.5
@@ -127,24 +128,22 @@ def close_filtering(pattern_list: List[int], win_size: int) -> List[Tuple[int, i
             s.append([pattern_list[i]])
     return s
 
-
-def merge_intersecting_intervals(intervals: List[Tuple[int, int]]) -> List[Tuple[int, int]]:
+def merge_intersecting_segments(segments: List[Segment]) -> List[Segment]:
     '''
-    At the entrance - list of intervals with start and end.
-    Find intersecting intervals in this list and merge it.
+    Find intersecting segments in segments list and merge it.
     '''
-    if len(intervals) < 2:
-        return intervals
-    intervals = sorted(intervals)
-    last_couple = intervals[0]
-    for i in range(1,len(intervals)):
-        if intervals[i][0] <= last_couple[1]:
-            intervals[i][0] = min(last_couple[0], intervals[i][0])
-            intervals[i][1] = max(last_couple[1], intervals[i][1])
-            intervals[i-1] = []
-        last_couple = intervals[i]
-    intervals = [x for x in intervals if x != []]
-    return intervals
+    if len(segments) < 2:
+        return segments
+    segments = sorted(segments, key = lambda segment: segment.from_timestamp)
+    previous_segment = segments[0]
+    for i in range(1, len(segments)):
+        if segments[i].from_timestamp <= previous_segment.to_timestamp:
+            segments[i].from_timestamp = min(previous_segment.from_timestamp, segments[i].from_timestamp)
+            segments[i].to_timestamp = max(previous_segment.to_timestamp, segments[i].to_timestamp)
+            segments[i - 1] = None
+        previous_segment = segments[i]
+    segments = [x for x in segments if x is not None]
+    return segments
 
 def get_start_and_end_of_segments(segments: List[List[int]]) -> List[Tuple[int, int]]:
     '''
diff --git a/analytics/analytics/utils/segments.py b/analytics/analytics/utils/segments.py
deleted file mode 100644
index 9455529..0000000
--- a/analytics/analytics/utils/segments.py
+++ /dev/null
@@ -1,9 +0,0 @@
-import pandas as pd
-
-from utils.common import timestamp_to_index
-
-def parse_segment(segment: dict, dataframe: pd.DataFrame):
-    start = timestamp_to_index(dataframe, pd.to_datetime(segment['from'], unit='ms'))
-    end = timestamp_to_index(dataframe, pd.to_datetime(segment['to'], unit='ms'))
-    data = dataframe['value'][start: end + 1]
-    return {'from': start, 'to': end, 'data': data}
diff --git a/analytics/tests/test_detectors.py b/analytics/tests/test_detectors.py
index f3444ba..ea499b9 100644
--- a/analytics/tests/test_detectors.py
+++ b/analytics/tests/test_detectors.py
@@ -44,5 +44,5 @@ class TestAnomalyDetector(unittest.TestCase):
         }
         detector = anomaly_detector.AnomalyDetector()
         detect_result = detector.detect(dataframe, cache)
-        result = [(1523889000005.0, 1523889000005.0)]
-        self.assertEqual(result, detect_result.segments)
+        result = [{ 'from': 1523889000005.0, 'to': 1523889000005.0 }]
+        self.assertEqual(result, detect_result.to_json()['segments'])
diff --git a/analytics/tests/test_utils.py b/analytics/tests/test_utils.py
index 494e70e..5fd7145 100644
--- a/analytics/tests/test_utils.py
+++ b/analytics/tests/test_utils.py
@@ -1,3 +1,5 @@
+from analytic_types.segment import Segment
+
 import utils
 import unittest
 import numpy as np
@@ -291,9 +293,8 @@ class TestUtils(unittest.TestCase):
         segments = [[1, 2, 3, 4], [5, 6, 7], [8], [], [12, 12]]
         result = [[1, 4], [5, 7], [8, 8], [12, 12]]
         utils_result = utils.get_start_and_end_of_segments(segments)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
+        for got, expected in zip(utils_result, result):
+            self.assertEqual(got, expected)
 
     def test_get_start_and_end_of_segments_empty(self):
         segments = []
@@ -301,73 +302,51 @@ class TestUtils(unittest.TestCase):
         utils_result = utils.get_start_and_end_of_segments(segments)
         self.assertEqual(result, utils_result)
 
-    def test_merge_intersecting_intervals(self):
-        index = [[10, 20], [30, 40]]
-        result = [[10, 20], [30, 40]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
-
-    def test_merge_intersecting_intervals_1(self):
-        index = [[10, 20], [13, 23], [15, 17], [20, 40]]
-        result = [[10, 40]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
-
-    def test_merge_intersecting_intervals_empty(self):
-        index = []
-        result = []
-        utils_result = utils.merge_intersecting_intervals(index)
-        self.assertEqual(result, utils_result)
-
-    def test_merge_intersecting_intervals_one(self):
-        index = [[10, 20]]
-        result = [[10, 20]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        self.assertEqual(result, utils_result)
-
-    def test_merge_intersecting_intervals_2(self):
-        index = [[10, 20], [13, 23], [25, 30], [35, 40]]
-        result = [[10, 23], [25, 30], [35, 40]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
-
-    def test_merge_intersecting_intervals_3(self):
-        index = [[10, 50], [5, 40], [15, 25], [6, 50]]
-        result = [[5, 50]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
-
-    def test_merge_intersecting_intervals_4(self):
-        index = [[5, 10], [10, 20], [25, 50]]
-        result = [[5, 20], [25, 50]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
-
-    def test_merge_intersecting_intervals_5(self):
-        index = [[20, 40], [10, 15], [50, 60]]
-        result = [[10, 15], [20, 40], [50, 60]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
+    def test_merge_intersecting_segments(self):
+        test_cases = [
+            {
+                'index': [Segment(10, 20), Segment(30, 40)],
+                'result': [[10, 20], [30, 40]]
+            },
+            {
+                'index': [Segment(10, 20), Segment(13, 23), Segment(15, 17), Segment(20, 40)],
+                'result': [[10, 40]]
+            },
+            {
+                'index': [],
+                'result': []
+            },
+            {
+                'index': [Segment(10, 20)],
+                'result': [[10, 20]]
+            },
+            {
+                'index': [Segment(10, 20), Segment(13, 23), Segment(25, 30), Segment(35, 40)],
+                'result': [[10, 23], [25, 30], [35, 40]]
+            },
+            {
+                'index': [Segment(10, 50), Segment(5, 40), Segment(15, 25), Segment(6, 50)],
+                'result': [[5, 50]]
+            },
+            {
+                'index': [Segment(5, 10), Segment(10, 20), Segment(25, 50)],
+                'result': [[5, 20], [25, 50]]
+            },
+            {
+                'index': [Segment(20, 40), Segment(10, 15), Segment(50, 60)],
+                'result': [[10, 15], [20, 40], [50, 60]]
+            },
+            {
+                'index': [Segment(20, 40), Segment(10, 20), Segment(50, 60)],
+                'result': [[10, 40], [50, 60]]
+            },
+        ]
 
-    def test_merge_intersecting_intervals_6(self):
-        index = [[20, 40], [10, 20], [50, 60]]
-        result = [[10, 40], [50, 60]]
-        utils_result = utils.merge_intersecting_intervals(index)
-        for idx, val in enumerate(utils_result):
-            self.assertEqual(result[idx][0], val[0])
-            self.assertEqual(result[idx][1], val[1])
+        for case in test_cases:
+            utils_result = utils.merge_intersecting_segments(case['index'])
+            for got, expected in zip(utils_result, case['result']):
+                self.assertEqual(got.from_timestamp, expected[0])
+                self.assertEqual(got.to_timestamp, expected[1])
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/server/src/services/alert_service.ts b/server/src/services/alert_service.ts
index ccbef95..371383e 100644
--- a/server/src/services/alert_service.ts
+++ b/server/src/services/alert_service.ts
@@ -26,9 +26,7 @@ export class Alert {
       from: segment.from,
       to: segment.to 
     };
-    if(segment.params) {
-      alert.params = segment.params;
-    }
+
     return alert;
   }
 }