feat: Add timestamps to segments models (#4236)

api/segments/migrations/0024_add_timestamps_to_segments.py

@@ -0,0 +1,84 @@
+# Generated by Django 3.2.25 on 2024-06-25 19:46
+
+from django.apps.registry import Apps
+from django.db import migrations, models
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+
+
+def set_null_timestamps(apps: Apps, schema_editor: BaseDatabaseSchemaEditor) -> None:
+    Segment = apps.get_model("segments", "Segment")
+    Segment.objects.update(created_at=None, updated_at=None)
+    HistoricalSegment = apps.get_model("segments", "HistoricalSegment")
+    HistoricalSegment.objects.update(created_at=None, updated_at=None)
+    Condition = apps.get_model("segments", "Condition")
+    Condition.objects.update(created_at=None, updated_at=None)
+    HistoricalCondition = apps.get_model("segments", "HistoricalCondition")
+    HistoricalCondition.objects.update(created_at=None, updated_at=None)
+
+    # Note that segment rules don't presently have a matching
+    # HistoricalSegmentRule as the history is not set up.
+    SegmentRule = apps.get_model("segments", "SegmentRule")
+    SegmentRule.objects.update(created_at=None, updated_at=None)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("segments", "0023_add_versioning_to_segments"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="condition",
+            name="created_at",
+            field=models.DateTimeField(auto_now_add=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="condition",
+            name="updated_at",
+            field=models.DateTimeField(auto_now=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="historicalcondition",
+            name="created_at",
+            field=models.DateTimeField(blank=True, editable=False, null=True),
+        ),
+        migrations.AddField(
+            model_name="historicalcondition",
+            name="updated_at",
+            field=models.DateTimeField(blank=True, editable=False, null=True),
+        ),
+        migrations.AddField(
+            model_name="historicalsegment",
+            name="created_at",
+            field=models.DateTimeField(blank=True, editable=False, null=True),
+        ),
+        migrations.AddField(
+            model_name="historicalsegment",
+            name="updated_at",
+            field=models.DateTimeField(blank=True, editable=False, null=True),
+        ),
+        migrations.AddField(
+            model_name="segment",
+            name="created_at",
+            field=models.DateTimeField(auto_now_add=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="segment",
+            name="updated_at",
+            field=models.DateTimeField(auto_now=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="segmentrule",
+            name="created_at",
+            field=models.DateTimeField(auto_now_add=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="segmentrule",
+            name="updated_at",
+            field=models.DateTimeField(auto_now=True, null=True),
+        ),
+        migrations.RunPython(
+            set_null_timestamps, reverse_code=migrations.RunPython.noop
+        ),
+    ]

api/segments/models.py

@@ -70,6 +70,9 @@ class Segment(
     )
     metadata = GenericRelation(Metadata)
 
+    created_at = models.DateTimeField(null=True, auto_now_add=True)
+    updated_at = models.DateTimeField(null=True, auto_now=True)
+
     # Only serves segments that are the canonical version.
     objects = SegmentManager()
 
@@ -198,6 +201,9 @@ class SegmentRule(SoftDeleteExportableModel):
 
     type = models.CharField(max_length=50, choices=RULE_TYPES)
 
+    created_at = models.DateTimeField(null=True, auto_now_add=True)
+    updated_at = models.DateTimeField(null=True, auto_now=True)
+
     def clean(self):
         super().clean()
         parents = [self.segment, self.rule]
@@ -305,6 +311,9 @@ class Condition(
         SegmentRule, on_delete=models.CASCADE, related_name="conditions"
     )
 
+    created_at = models.DateTimeField(null=True, auto_now_add=True)
+    updated_at = models.DateTimeField(null=True, auto_now=True)
+
     def __str__(self):
         return "Condition for %s: %s %s %s" % (
             str(self.rule),