diff --git a/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.test.ts b/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.test.ts
new file mode 100644
index 0000000000..cb9a735ead
--- /dev/null
+++ b/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.test.ts
@@ -0,0 +1,135 @@
+import { IUser } from 'lib/server-impl';
+import dbInit, { ITestDb } from '../../../test/e2e/helpers/database-init';
+import getLogger from '../../../test/fixtures/no-logger';
+import { IChangeRequestSegmentUsageReadModel } from './change-request-segment-usage-read-model';
+import { createChangeRequestSegmentUsageModel } from './createChangeRequestSegmentUsageReadModel';
+import { randomId } from '../../../lib/util';
+
+let db: ITestDb;
+let user: IUser;
+
+const CR_ID = 123456;
+const FLAG_NAME = 'crarm-test-flag';
+
+let readModel: IChangeRequestSegmentUsageReadModel;
+
+beforeAll(async () => {
+    db = await dbInit('change_request_access_read_model_serial', getLogger);
+
+    user = await db.stores.userStore.insert({
+        username: 'cr-creator',
+    });
+
+    readModel = createChangeRequestSegmentUsageModel(db.rawDatabase);
+
+    await db.stores.featureToggleStore.create('default', {
+        name: FLAG_NAME,
+    });
+});
+
+afterAll(async () => {
+    await db.destroy();
+});
+
+afterEach(async () => {
+    await db.rawDatabase.table('change_requests').where('id', CR_ID).delete();
+    await db.rawDatabase
+        .table('change_request_events')
+        .where('change_request_id', CR_ID)
+        .delete();
+});
+
+const createCR = async (state) => {
+    await db.rawDatabase.table('change_requests').insert({
+        id: CR_ID,
+        environment: 'default',
+        state,
+        project: 'default',
+        created_by: user.id,
+        created_at: '2023-01-01 00:00:00',
+        min_approvals: 1,
+        title: 'My change request',
+    });
+};
+
+const addChangeRequestChange = async (flagName, action, change) => {
+    await db.rawDatabase.table('change_request_events').insert({
+        feature: flagName,
+        action,
+        payload: change,
+        created_at: '2023-01-01 00:01:00',
+        change_request_id: CR_ID,
+        created_by: user.id,
+    });
+};
+
+const addStrategyToCr = async (segmentId: number, flagName: string) => {
+    await addChangeRequestChange(flagName, 'addStrategy', {
+        name: 'flexibleRollout',
+        title: '',
+        disabled: false,
+        segments: [segmentId],
+        variants: [],
+        parameters: {
+            groupId: flagName,
+            rollout: '100',
+            stickiness: 'default',
+        },
+        constraints: [],
+    });
+};
+
+const updateStrategyInCr = async (
+    strategyId: string,
+    segmentId: number,
+    flagName: string,
+) => {
+    await addChangeRequestChange(flagName, 'updateStrategy', {
+        id: strategyId,
+        name: 'flexibleRollout',
+        title: '',
+        disabled: false,
+        segments: [segmentId],
+        variants: [],
+        parameters: {
+            groupId: flagName,
+            rollout: '100',
+            stickiness: 'default',
+        },
+        constraints: [],
+    });
+};
+
+describe.each([
+    [
+        'updateStrategy',
+        (segmentId: number) =>
+            updateStrategyInCr(randomId(), segmentId, FLAG_NAME),
+    ],
+    [
+        'addStrategy',
+        (segmentId: number) => addStrategyToCr(segmentId, FLAG_NAME),
+    ],
+])('Should handle %s changes correctly', (_, addOrUpdateStrategy) => {
+    test.each([
+        ['Draft', true],
+        ['In Review', true],
+        ['Scheduled', true],
+        ['Approved', true],
+        ['Rejected', false],
+        ['Cancelled', false],
+        ['Applied', false],
+    ])(
+        'Changes in %s CRs should make it %s',
+        async (state, expectedOutcome) => {
+            await createCR(state);
+
+            const segmentId = 3;
+            await addOrUpdateStrategy(segmentId);
+
+            expect(
+                await readModel.isSegmentUsedInActiveChangeRequests(segmentId),
+            ).toBe(expectedOutcome);
+        },
+    );
+});
diff --git a/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.ts b/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.ts
new file mode 100644
index 0000000000..08ba2f3217
--- /dev/null
+++ b/src/lib/features/change-request-segment-usage-read-model.ts/change-request-segment-usage-read-model.ts
@@ -0,0 +1,3 @@
+export interface IChangeRequestSegmentUsageReadModel {
+    isSegmentUsedInActiveChangeRequests(segmentId: number): Promise<boolean>;
+}
diff --git a/src/lib/features/change-request-segment-usage-read-model.ts/createChangeRequestSegmentUsageReadModel.ts b/src/lib/features/change-request-segment-usage-read-model.ts/createChangeRequestSegmentUsageReadModel.ts
new file mode 100644
index 0000000000..6865a20ae1
--- /dev/null
+++ b/src/lib/features/change-request-segment-usage-read-model.ts/createChangeRequestSegmentUsageReadModel.ts
@@ -0,0 +1,15 @@
+import { Db } from 'lib/server-impl';
+import { ChangeRequestSegmentUsageReadModel } from './sql-change-request-segment-usage-read-model';
+import { FakeChangeRequestSegmentUsageReadModel } from './fake-change-request-segment-usage-read-model';
+import { IChangeRequestSegmentUsageReadModel } from './change-request-segment-usage-read-model';
+
+export const createChangeRequestSegmentUsageModel = (
+    db: Db,
+): IChangeRequestSegmentUsageReadModel => {
+    return new ChangeRequestSegmentUsageReadModel(db);
+};
+
+export const createFakeChangeRequestAccessService =
+    (): IChangeRequestSegmentUsageReadModel => {
+        return new FakeChangeRequestSegmentUsageReadModel();
+    };
diff --git a/src/lib/features/change-request-segment-usage-read-model.ts/fake-change-request-segment-usage-read-model.ts b/src/lib/features/change-request-segment-usage-read-model.ts/fake-change-request-segment-usage-read-model.ts
new file mode 100644
index 0000000000..d5cb25554a
--- /dev/null
+++ b/src/lib/features/change-request-segment-usage-read-model.ts/fake-change-request-segment-usage-read-model.ts
@@ -0,0 +1,16 @@
+import { IChangeRequestSegmentUsageReadModel } from './change-request-segment-usage-read-model';
+
+export class FakeChangeRequestSegmentUsageReadModel
+    implements IChangeRequestSegmentUsageReadModel
+{
+    private isSegmentUsedInActiveChangeRequestsValue: boolean;
+
+    constructor(isSegmentUsedInActiveChangeRequests = false) {
+        this.isSegmentUsedInActiveChangeRequestsValue =
+            isSegmentUsedInActiveChangeRequests;
+    }
+
+    public async isSegmentUsedInActiveChangeRequests(): Promise<boolean> {
+        return this.isSegmentUsedInActiveChangeRequestsValue;
+    }
+}
diff --git a/src/lib/features/change-request-segment-usage-read-model.ts/sql-change-request-segment-usage-read-model.ts b/src/lib/features/change-request-segment-usage-read-model.ts/sql-change-request-segment-usage-read-model.ts
new file mode 100644
index 0000000000..47dbf632ae
--- /dev/null
+++ b/src/lib/features/change-request-segment-usage-read-model.ts/sql-change-request-segment-usage-read-model.ts
@@ -0,0 +1,30 @@
+import { Db } from '../../db/db';
+import { IChangeRequestSegmentUsageReadModel } from './change-request-segment-usage-read-model';
+
+export class ChangeRequestSegmentUsageReadModel
+    implements IChangeRequestSegmentUsageReadModel
+{
+    private db: Db;
+
+    constructor(db: Db) {
+        this.db = db;
+    }
+
+    public async isSegmentUsedInActiveChangeRequests(
+        segmentId: number,
+    ): Promise<boolean> {
+        const result = await this.db.raw(
+            `SELECT events.*
+             FROM change_request_events events
+             JOIN change_requests cr ON events.change_request_id = cr.id
+             WHERE cr.state IN ('Draft', 'In Review', 'Scheduled', 'Approved')
+             AND events.action IN ('updateStrategy', 'addStrategy');`,
+        );
+
+        const isUsed = result.rows.some((row) =>
+            row.payload?.segments?.includes(segmentId),
+        );
+
+        return isUsed;
+    }
+}