diff --git a/tools/integration-tests/test/reservedTurnDaemonApiRace.integration.test.ts b/tools/integration-tests/test/reservedTurnDaemonApiRace.integration.test.ts
new file mode 100644
index 0000000..09e0888
--- /dev/null
+++ b/tools/integration-tests/test/reservedTurnDaemonApiRace.integration.test.ts
@@ -0,0 +1,94 @@
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+
+import type { DatabaseClient } from '@sammo-ts/game-api/context.js';
+import {
+    ReservedTurnRevisionConflictError,
+    getGeneralTurnSnapshot,
+    setGeneralTurn,
+} from '@sammo-ts/game-api/turns/reservedTurns.js';
+import { InMemoryReservedTurnStore } from '@sammo-ts/game-engine/turn/reservedTurnStore.js';
+import { createGamePostgresConnector } from '@sammo-ts/infra';
+
+const databaseUrl = process.env.RESERVED_TURN_DATABASE_URL;
+const describeIntegration = databaseUrl ? describe : describe.skip;
+const GENERAL_ID = 2_147_400_010;
+
+describeIntegration('reserved turn daemon/API stale-cache race', () => {
+    const connector = databaseUrl ? createGamePostgresConnector({ url: databaseUrl }) : null;
+
+    beforeAll(async () => {
+        if (!connector) {
+            return;
+        }
+        await connector.connect();
+        await connector.prisma.generalTurn.deleteMany({ where: { generalId: GENERAL_ID } });
+        await connector.prisma.generalTurnRevision.deleteMany({ where: { generalId: GENERAL_ID } });
+        await connector.prisma.generalTurn.createMany({
+            data: [
+                { generalId: GENERAL_ID, turnIdx: 0, actionCode: 'che_훈련', arg: {} },
+                { generalId: GENERAL_ID, turnIdx: 1, actionCode: '휴식', arg: {} },
+            ],
+        });
+        await connector.prisma.generalTurnRevision.create({
+            data: { generalId: GENERAL_ID, revision: 0 },
+        });
+    });
+
+    afterAll(async () => {
+        if (!connector) {
+            return;
+        }
+        await connector.prisma.generalTurn.deleteMany({ where: { generalId: GENERAL_ID } });
+        await connector.prisma.generalTurnRevision.deleteMany({ where: { generalId: GENERAL_ID } });
+        await connector.disconnect();
+    });
+
+    it('refreshes an already-loaded daemon queue after an API write and serializes later writers', async () => {
+        if (!connector) {
+            throw new Error('integration connector is unavailable');
+        }
+        const store = new InMemoryReservedTurnStore(connector.prisma, {
+            maxGeneralTurns: 30,
+            maxNationTurns: 12,
+            leaseOwner: 'integration-stale-cache-daemon',
+            leaseDurationMs: 60_000,
+        });
+
+        await store.loadAll();
+        expect(store.getGeneralTurn(GENERAL_ID, 1).action).toBe('휴식');
+
+        const apiWrite = await connector.prisma.$transaction((transaction) =>
+            setGeneralTurn(transaction as unknown as DatabaseClient, GENERAL_ID, 1, 'che_화계', { destCityId: 7 }, 0)
+        );
+        expect(apiWrite.revision).toBe(1);
+
+        await store.prepareTurnsForExecution(GENERAL_ID);
+        expect(store.getGeneralTurn(GENERAL_ID, 1)).toEqual({
+            action: 'che_화계',
+            args: { destCityId: 7 },
+        });
+
+        await expect(
+            connector.prisma.$transaction((transaction) =>
+                setGeneralTurn(transaction as unknown as DatabaseClient, GENERAL_ID, 2, 'che_사기진작', {}, 1)
+            )
+        ).rejects.toBeInstanceOf(ReservedTurnRevisionConflictError);
+
+        store.shiftGeneralTurns(GENERAL_ID, -1);
+        const changes = store.peekDirtyState();
+        await connector.prisma.$transaction((transaction) => store.persistChanges(transaction, changes));
+        store.acknowledgeDirtyState(changes);
+
+        const afterDaemon = await getGeneralTurnSnapshot(connector.prisma as unknown as DatabaseClient, GENERAL_ID);
+        expect(afterDaemon.revision).toBe(2);
+        expect(afterDaemon.turns[0]).toMatchObject({
+            action: 'che_화계',
+            args: { destCityId: 7 },
+        });
+
+        const retry = await connector.prisma.$transaction((transaction) =>
+            setGeneralTurn(transaction as unknown as DatabaseClient, GENERAL_ID, 2, 'che_사기진작', {}, 2)
+        );
+        expect(retry.revision).toBe(3);
+    });
+});