fix: allow deletion of segments referencing strategies in archived f… (#6406)

Subset of #6392, allowing you to delete segments that are referenced in
strategies on archived features.

frontend/src/component/segments/SegmentDelete/SegmentDeleteConfirm/SegmentDeleteConfirm.tsx

@@ -3,7 +3,7 @@ import { Dialogue } from 'component/common/Dialogue/Dialogue';
 import Input from 'component/common/Input/Input';
 import { ISegment } from 'interfaces/segment';
 import { SEGMENT_DIALOG_NAME_ID } from 'utils/testIds';
-import { styled } from '@mui/material';
+import { Alert, styled } from '@mui/material';
 
 const StyledInput = styled(Input)(({ theme }) => ({
     marginTop: theme.spacing(2),
@@ -46,6 +46,11 @@ export const SegmentDeleteConfirm = ({
             onClose={handleCancel}
             formId={formId}
         >
+            <Alert sx={{ marginBottom: 2 }} severity='warning'>
+                Deleted segments may be referenced in strategies if the feature
+                flag is archived. Removing the segment will also remove the
+                segments from strategies of archived flags.
+            </Alert>
             <p>
                 In order to delete this segment, please enter the name of the
                 segment in the field below: <strong>{segment?.name}</strong>

src/lib/features/feature-toggle/feature-toggle-strategies-store.ts

@@ -814,7 +814,14 @@ class FeatureStrategiesStore implements IFeatureStrategiesStore {
                 `${T.featureStrategySegment}.feature_strategy_id`,
                 `${T.featureStrategies}.id`,
             )
-            .where(`${T.featureStrategySegment}.segment_id`, '=', segmentId);
+            .join(
+                T.features,
+                `${T.features}.name`,
+                `${T.featureStrategies}.feature_name`,
+            )
+            .where(`${T.featureStrategySegment}.segment_id`, '=', segmentId)
+            .andWhere(`${T.features}.archived_at`, 'IS', null);
+
         stopTimer();
         return rows.map(mapRow);
     }

src/lib/features/segment/admin-segment.e2e.test.ts

@@ -290,6 +290,36 @@ test('should not delete segments used by strategies', async () => {
     expect((await fetchSegments()).length).toEqual(1);
 });
 
+test('should delete segments used by strategies in archived feature toggles', async () => {
+    await app.createSegment({
+        name: 'a',
+        constraints: [],
+    });
+    const toggle = mockFeatureToggle();
+    await createFeatureToggle(app, toggle);
+    const [segment] = await fetchSegments();
+
+    await addStrategyToFeatureEnv(
+        app,
+        { ...toggle.strategies[0] },
+        'default',
+        toggle.name,
+    );
+    const [feature] = await fetchFeatures();
+    //@ts-ignore
+    await addSegmentsToStrategy([segment.id], feature.strategies[0].id);
+    const segments = await fetchSegments();
+    expect(segments.length).toEqual(1);
+
+    await app.archiveFeature(feature.name);
+
+    await app.request
+        .delete(`${SEGMENTS_BASE_PATH}/${segments[0].id}`)
+        .expect(204);
+
+    expect((await fetchSegments()).length).toEqual(0);
+});
+
 test('should list strategies by segment', async () => {
     await app.createSegment({
         name: 'S1',