feat: add LearningAssistantCourseEnabled model to store course overrides

This commit adds a LearningAssistantCourseEnabled model to store overrides for whether the Learning Assistant feature is enabled. Although whether the feature is enabled will first be controlled by a CourseWaffleFlag, eventually, this model will allow course team members to selectively disable or re-enable the feature themselves.

learning_assistant/migrations/0005_learningassistantcourseenabled.py

@@ -0,0 +1,29 @@
+# Generated by Django 3.2.23 on 2024-01-04 15:02
+
+from django.db import migrations, models
+import django.utils.timezone
+import model_utils.fields
+import opaque_keys.edx.django.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('learning_assistant', '0004_remove_courseprompt_prompt'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='LearningAssistantCourseEnabled',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created', model_utils.fields.AutoCreatedField(default=django.utils.timezone.now, editable=False, verbose_name='created')),
+                ('modified', model_utils.fields.AutoLastModifiedField(default=django.utils.timezone.now, editable=False, verbose_name='modified')),
+                ('course_id', opaque_keys.edx.django.models.CourseKeyField(db_index=True, max_length=255, unique=True)),
+                ('enabled', models.BooleanField()),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

learning_assistant/models.py

@@ -30,3 +30,20 @@ def get_json_prompt_content_by_course_id(cls, course_id):
         except cls.DoesNotExist:
             json_prompt_content = None
         return json_prompt_content
+
+
+class LearningAssistantCourseEnabled(TimeStampedModel):
+    """
+    This model stores whether the Learning Assistant is enabled for a particular course ID.
+
+    For now, the purpose of this model is to store overrides added by course team members. By default, the Learning
+    Assistant will be enabled via a CourseWaffleFlag. This model will store whether course team members have manually
+    disabled the Learning Assistant.
+
+    .. no_pii: This model has no PII.
+    """
+
+    # course ID with for the course in which the Learning Assistant is enabled or disabled
+    course_id = CourseKeyField(max_length=255, db_index=True, unique=True)
+
+    enabled = models.BooleanField()