Remove several fields from DataSerializer (#7663)

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### Motivation and context
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`original_chunk_type` and `compressed_chunk_type` have no effect,
because the task creation code overwrites these values based on
`use_zip_chunks`. With `size`, the code relies on the default of zero,
and attempting to overriding it will just lead to an incorrect value
being saved to the database.

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[cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning)
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changelog.d/20240322_193952_roman_clean_data_serializer.md

@@ -0,0 +1,6 @@
+### Removed
+
+- The `POST /api/tasks/{id}/data` endpoint no longer accepts several
+  parameters that didn't have any useful function: `size`,
+  `compressed_chunk_type`, `original_chunk_type`
+  (<https://github.com/opencv/cvat/pull/7663>)

cvat/apps/engine/backup.py

@@ -431,7 +431,7 @@ def serialize_custom_file_mapping(db_segment: models.Segment):
         def serialize_data():
             data_serializer = DataSerializer(self._db_data)
             data = data_serializer.data
-            data['chunk_type'] = data.pop('compressed_chunk_type')
+            data['chunk_type'] = self._db_data.compressed_chunk_type
 
             # There are no deleted frames in DataSerializer so we need to pick it
             data['deleted_frames'] = self._db_data.deleted_frames

cvat/apps/engine/serializers.py

@@ -942,8 +942,7 @@ class DataSerializer(serializers.ModelSerializer):
     class Meta:
         model = models.Data
         fields = (
-            'chunk_size', 'size', 'image_quality', 'start_frame', 'stop_frame', 'frame_filter',
-            'compressed_chunk_type', 'original_chunk_type',
+            'chunk_size', 'image_quality', 'start_frame', 'stop_frame', 'frame_filter',
             'client_files', 'server_files', 'remote_files',
             'use_zip_chunks', 'server_files_exclude',
             'cloud_storage_id', 'use_cache', 'copy_data', 'storage_method',
@@ -952,7 +951,6 @@ class Meta:
         )
         extra_kwargs = {
             'chunk_size': { 'help_text': "Maximum number of frames per chunk" },
-            'size': { 'help_text': "The number of frames" },
             'start_frame': { 'help_text': "First frame index" },
             'stop_frame': { 'help_text': "Last frame index" },
             'frame_filter': { 'help_text': "Frame filter. The only supported syntax is: 'step=N'" },

cvat/schema.yml

@@ -6738,11 +6738,6 @@ components:
           minimum: 0
           nullable: true
           description: Maximum number of frames per chunk
-        size:
-          type: integer
-          maximum: 2147483647
-          minimum: 0
-          description: The number of frames
         image_quality:
           type: integer
           maximum: 100
@@ -6762,10 +6757,6 @@ components:
           type: string
           description: 'Frame filter. The only supported syntax is: ''step=N'''
           maxLength: 256
-        compressed_chunk_type:
-          $ref: '#/components/schemas/ChunkType'
-        original_chunk_type:
-          $ref: '#/components/schemas/ChunkType'
         client_files:
           type: array
           items: