We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
New CSV imports use autogenerated column names.
## Description
<!-- A clear and concise description of what the bug is. -->
According to #459, newly imported CSVs are supposed to use the first row as headers by default. However, newly uploaded CSVs are showing autogenerated column names.

## Expected behavior
<!-- A clear and concise description of what you expected to happen. -->
The first row of the CSV should be used as header names by default.

## To Reproduce
<!-- How can we recreate this bug? Please try to provide a Minimal, Complete, and Verifiable (http://stackoverflow.com/help/mcve) example if code-related. -->
Upload a CSV from the Mathesar UI. Column names will be of the form `column_0`, etc.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `mathesar/serializers.py`
Content:
```
1 from django.urls import reverse
2 from rest_framework import serializers
3 
4 from mathesar.models import Table, Schema, DataFile, Database
5 
6 
7 class NestedTableSerializer(serializers.HyperlinkedModelSerializer):
8     url = serializers.SerializerMethodField()
9 
10     class Meta:
11         model = Table
12         fields = ['id', 'name', 'url']
13 
14     def get_url(self, obj):
15         request = self.context['request']
16         return request.build_absolute_uri(reverse('table-detail', kwargs={'pk': obj.pk}))
17 
18 
19 class ModelNameField(serializers.CharField):
20     """
21     De-serializes the request field as a string, but serializes the response field as
22     `model.name`. Required to support passing and returing a model name from the
23     endpoint, while also storing the model as a related field.
24     """
25     def to_representation(self, value):
26         return value.name
27 
28 
29 class SchemaSerializer(serializers.HyperlinkedModelSerializer):
30     tables = NestedTableSerializer(many=True, read_only=True)
31     name = serializers.CharField()
32     database = ModelNameField(max_length=128)
33 
34     class Meta:
35         model = Schema
36         fields = ['id', 'name', 'tables', 'database', 'has_dependencies']
37 
38 
39 class SimpleColumnSerializer(serializers.Serializer):
40     name = serializers.CharField()
41     type = serializers.CharField()
42 
43 
44 class ColumnSerializer(SimpleColumnSerializer):
45     index = serializers.IntegerField(source='column_index', read_only=True)
46     nullable = serializers.BooleanField(default=True)
47     primary_key = serializers.BooleanField(default=False)
48     valid_target_types = serializers.ListField(read_only=True)
49 
50 
51 class TableSerializer(serializers.ModelSerializer):
52     columns = SimpleColumnSerializer(many=True, read_only=True, source='sa_columns')
53     records = serializers.SerializerMethodField()
54     name = serializers.CharField()
55     data_files = serializers.PrimaryKeyRelatedField(required=False, many=True, queryset=DataFile.objects.all())
56 
57     class Meta:
58         model = Table
59         fields = ['id', 'name', 'schema', 'created_at', 'updated_at',
60                   'columns', 'records', 'data_files', 'has_dependencies']
61 
62     def get_records(self, obj):
63         if isinstance(obj, Table):
64             # Only get records if we are serializing an existing table
65             request = self.context['request']
66             return request.build_absolute_uri(reverse('table-record-list', kwargs={'table_pk': obj.pk}))
67         else:
68             return None
69 
70 
71 class RecordSerializer(serializers.BaseSerializer):
72     def to_representation(self, instance):
73         return instance._asdict()
74 
75 
76 class RecordListParameterSerializer(serializers.Serializer):
77     filters = serializers.JSONField(required=False, default=[])
78     order_by = serializers.JSONField(required=False, default=[])
79     group_count_by = serializers.JSONField(required=False, default=[])
80 
81 
82 class DatabaseSerializer(serializers.ModelSerializer):
83     supported_types = serializers.ListField(child=serializers.CharField())
84 
85     class Meta:
86         model = Database
87         fields = ['id', 'name', 'deleted', 'supported_types']
88         read_only_fields = ['id', 'name', 'deleted', 'supported_types']
89 
90 
91 class DataFileSerializer(serializers.ModelSerializer):
92     user = serializers.PrimaryKeyRelatedField(
93         default=serializers.CurrentUserDefault(), read_only=True
94     )
95 
96     class Meta:
97         model = DataFile
98         fields = [
99             'id', 'file', 'table_imported_to', 'user', 'header', 'delimiter', 'escapechar', 'quotechar'
100         ]
101         extra_kwargs = {'delimiter': {'trim_whitespace': False},
102                         'escapechar': {'trim_whitespace': False},
103                         'quotechar': {'trim_whitespace': False}}
104         # We only currently support importing to a new table, so setting a table via API is invalid.
105         # User should be set automatically, not submitted via the API.
106         read_only_fields = ['table_imported_to']
107 
108     def save(self, **kwargs):
109         """
110         Set user to current user while saving the data file.
111         """
112         current_user = self.fields['user'].get_default()
113         if current_user.is_authenticated:
114             kwargs['user'] = current_user
115         return super().save(**kwargs)
116
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/mathesar/serializers.py b/mathesar/serializers.py
--- a/mathesar/serializers.py
+++ b/mathesar/serializers.py
@@ -100,7 +100,8 @@
         ]
         extra_kwargs = {'delimiter': {'trim_whitespace': False},
                         'escapechar': {'trim_whitespace': False},
-                        'quotechar': {'trim_whitespace': False}}
+                        'quotechar': {'trim_whitespace': False},
+                        'header': {'required': True}}
         # We only currently support importing to a new table, so setting a table via API is invalid.
         # User should be set automatically, not submitted via the API.
         read_only_fields = ['table_imported_to']

{"golden_diff": "diff --git a/mathesar/serializers.py b/mathesar/serializers.py\n--- a/mathesar/serializers.py\n+++ b/mathesar/serializers.py\n@@ -100,7 +100,8 @@\n         ]\n         extra_kwargs = {'delimiter': {'trim_whitespace': False},\n                         'escapechar': {'trim_whitespace': False},\n-                        'quotechar': {'trim_whitespace': False}}\n+                        'quotechar': {'trim_whitespace': False},\n+                        'header': {'required': True}}\n         # We only currently support importing to a new table, so setting a table via API is invalid.\n         # User should be set automatically, not submitted via the API.\n         read_only_fields = ['table_imported_to']\n", "issue": "New CSV imports use autogenerated column names.\n## Description\r\n<!-- A clear and concise description of what the bug is. -->\r\nAccording to #459, newly imported CSVs are supposed to use the first row as headers by default. However, newly uploaded CSVs are showing autogenerated column names.\r\n\r\n## Expected behavior\r\n<!-- A clear and concise description of what you expected to happen. -->\r\nThe first row of the CSV should be used as header names by default.\r\n\r\n## To Reproduce\r\n<!-- How can we recreate this bug? Please try to provide a Minimal, Complete, and Verifiable (http://stackoverflow.com/help/mcve) example if code-related. -->\r\nUpload a CSV from the Mathesar UI. Column names will be of the form `column_0`, etc.\n", "before_files": [{"content": "from django.urls import reverse\nfrom rest_framework import serializers\n\nfrom mathesar.models import Table, Schema, DataFile, Database\n\n\nclass NestedTableSerializer(serializers.HyperlinkedModelSerializer):\n    url = serializers.SerializerMethodField()\n\n    class Meta:\n        model = Table\n        fields = ['id', 'name', 'url']\n\n    def get_url(self, obj):\n        request = self.context['request']\n        return request.build_absolute_uri(reverse('table-detail', kwargs={'pk': obj.pk}))\n\n\nclass ModelNameField(serializers.CharField):\n    \"\"\"\n    De-serializes the request field as a string, but serializes the response field as\n    `model.name`. Required to support passing and returing a model name from the\n    endpoint, while also storing the model as a related field.\n    \"\"\"\n    def to_representation(self, value):\n        return value.name\n\n\nclass SchemaSerializer(serializers.HyperlinkedModelSerializer):\n    tables = NestedTableSerializer(many=True, read_only=True)\n    name = serializers.CharField()\n    database = ModelNameField(max_length=128)\n\n    class Meta:\n        model = Schema\n        fields = ['id', 'name', 'tables', 'database', 'has_dependencies']\n\n\nclass SimpleColumnSerializer(serializers.Serializer):\n    name = serializers.CharField()\n    type = serializers.CharField()\n\n\nclass ColumnSerializer(SimpleColumnSerializer):\n    index = serializers.IntegerField(source='column_index', read_only=True)\n    nullable = serializers.BooleanField(default=True)\n    primary_key = serializers.BooleanField(default=False)\n    valid_target_types = serializers.ListField(read_only=True)\n\n\nclass TableSerializer(serializers.ModelSerializer):\n    columns = SimpleColumnSerializer(many=True, read_only=True, source='sa_columns')\n    records = serializers.SerializerMethodField()\n    name = serializers.CharField()\n    data_files = serializers.PrimaryKeyRelatedField(required=False, many=True, queryset=DataFile.objects.all())\n\n    class Meta:\n        model = Table\n        fields = ['id', 'name', 'schema', 'created_at', 'updated_at',\n                  'columns', 'records', 'data_files', 'has_dependencies']\n\n    def get_records(self, obj):\n        if isinstance(obj, Table):\n            # Only get records if we are serializing an existing table\n            request = self.context['request']\n            return request.build_absolute_uri(reverse('table-record-list', kwargs={'table_pk': obj.pk}))\n        else:\n            return None\n\n\nclass RecordSerializer(serializers.BaseSerializer):\n    def to_representation(self, instance):\n        return instance._asdict()\n\n\nclass RecordListParameterSerializer(serializers.Serializer):\n    filters = serializers.JSONField(required=False, default=[])\n    order_by = serializers.JSONField(required=False, default=[])\n    group_count_by = serializers.JSONField(required=False, default=[])\n\n\nclass DatabaseSerializer(serializers.ModelSerializer):\n    supported_types = serializers.ListField(child=serializers.CharField())\n\n    class Meta:\n        model = Database\n        fields = ['id', 'name', 'deleted', 'supported_types']\n        read_only_fields = ['id', 'name', 'deleted', 'supported_types']\n\n\nclass DataFileSerializer(serializers.ModelSerializer):\n    user = serializers.PrimaryKeyRelatedField(\n        default=serializers.CurrentUserDefault(), read_only=True\n    )\n\n    class Meta:\n        model = DataFile\n        fields = [\n            'id', 'file', 'table_imported_to', 'user', 'header', 'delimiter', 'escapechar', 'quotechar'\n        ]\n        extra_kwargs = {'delimiter': {'trim_whitespace': False},\n                        'escapechar': {'trim_whitespace': False},\n                        'quotechar': {'trim_whitespace': False}}\n        # We only currently support importing to a new table, so setting a table via API is invalid.\n        # User should be set automatically, not submitted via the API.\n        read_only_fields = ['table_imported_to']\n\n    def save(self, **kwargs):\n        \"\"\"\n        Set user to current user while saving the data file.\n        \"\"\"\n        current_user = self.fields['user'].get_default()\n        if current_user.is_authenticated:\n            kwargs['user'] = current_user\n        return super().save(**kwargs)\n", "path": "mathesar/serializers.py"}], "after_files": [{"content": "from django.urls import reverse\nfrom rest_framework import serializers\n\nfrom mathesar.models import Table, Schema, DataFile, Database\n\n\nclass NestedTableSerializer(serializers.HyperlinkedModelSerializer):\n    url = serializers.SerializerMethodField()\n\n    class Meta:\n        model = Table\n        fields = ['id', 'name', 'url']\n\n    def get_url(self, obj):\n        request = self.context['request']\n        return request.build_absolute_uri(reverse('table-detail', kwargs={'pk': obj.pk}))\n\n\nclass ModelNameField(serializers.CharField):\n    \"\"\"\n    De-serializes the request field as a string, but serializes the response field as\n    `model.name`. Required to support passing and returing a model name from the\n    endpoint, while also storing the model as a related field.\n    \"\"\"\n    def to_representation(self, value):\n        return value.name\n\n\nclass SchemaSerializer(serializers.HyperlinkedModelSerializer):\n    tables = NestedTableSerializer(many=True, read_only=True)\n    name = serializers.CharField()\n    database = ModelNameField(max_length=128)\n\n    class Meta:\n        model = Schema\n        fields = ['id', 'name', 'tables', 'database', 'has_dependencies']\n\n\nclass SimpleColumnSerializer(serializers.Serializer):\n    name = serializers.CharField()\n    type = serializers.CharField()\n\n\nclass ColumnSerializer(SimpleColumnSerializer):\n    index = serializers.IntegerField(source='column_index', read_only=True)\n    nullable = serializers.BooleanField(default=True)\n    primary_key = serializers.BooleanField(default=False)\n    valid_target_types = serializers.ListField(read_only=True)\n\n\nclass TableSerializer(serializers.ModelSerializer):\n    columns = SimpleColumnSerializer(many=True, read_only=True, source='sa_columns')\n    records = serializers.SerializerMethodField()\n    name = serializers.CharField()\n    data_files = serializers.PrimaryKeyRelatedField(required=False, many=True, queryset=DataFile.objects.all())\n\n    class Meta:\n        model = Table\n        fields = ['id', 'name', 'schema', 'created_at', 'updated_at',\n                  'columns', 'records', 'data_files', 'has_dependencies']\n\n    def get_records(self, obj):\n        if isinstance(obj, Table):\n            # Only get records if we are serializing an existing table\n            request = self.context['request']\n            return request.build_absolute_uri(reverse('table-record-list', kwargs={'table_pk': obj.pk}))\n        else:\n            return None\n\n\nclass RecordSerializer(serializers.BaseSerializer):\n    def to_representation(self, instance):\n        return instance._asdict()\n\n\nclass RecordListParameterSerializer(serializers.Serializer):\n    filters = serializers.JSONField(required=False, default=[])\n    order_by = serializers.JSONField(required=False, default=[])\n    group_count_by = serializers.JSONField(required=False, default=[])\n\n\nclass DatabaseSerializer(serializers.ModelSerializer):\n    supported_types = serializers.ListField(child=serializers.CharField())\n\n    class Meta:\n        model = Database\n        fields = ['id', 'name', 'deleted', 'supported_types']\n        read_only_fields = ['id', 'name', 'deleted', 'supported_types']\n\n\nclass DataFileSerializer(serializers.ModelSerializer):\n    user = serializers.PrimaryKeyRelatedField(\n        default=serializers.CurrentUserDefault(), read_only=True\n    )\n\n    class Meta:\n        model = DataFile\n        fields = [\n            'id', 'file', 'table_imported_to', 'user', 'header', 'delimiter', 'escapechar', 'quotechar'\n        ]\n        extra_kwargs = {'delimiter': {'trim_whitespace': False},\n                        'escapechar': {'trim_whitespace': False},\n                        'quotechar': {'trim_whitespace': False},\n                        'header': {'required': True}}\n        # We only currently support importing to a new table, so setting a table via API is invalid.\n        # User should be set automatically, not submitted via the API.\n        read_only_fields = ['table_imported_to']\n\n    def save(self, **kwargs):\n        \"\"\"\n        Set user to current user while saving the data file.\n        \"\"\"\n        current_user = self.fields['user'].get_default()\n        if current_user.is_authenticated:\n            kwargs['user'] = current_user\n        return super().save(**kwargs)\n", "path": "mathesar/serializers.py"}]}