diff --git a/packages/api/src/__tests__/timeline-project-load-support.test.ts b/packages/api/src/__tests__/timeline-project-load-support.test.ts
new file mode 100644
index 0000000..86f99c4
--- /dev/null
+++ b/packages/api/src/__tests__/timeline-project-load-support.test.ts
@@ -0,0 +1,165 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+vi.mock("@capakraken/application", () => ({
+  listAssignmentBookings: vi.fn(),
+}));
+
+vi.mock("../router/project-planning-read-model.js", () => ({
+  loadProjectPlanningReadModel: vi.fn(),
+}));
+
+vi.mock("../router/timeline-project-query-support.js", () => ({
+  findTimelineProjectOrThrow: vi.fn(),
+  projectShiftContextSelect: { id: true },
+  timelineProjectContextSelect: { id: true },
+}));
+
+vi.mock("../router/timeline-shift-planning.js", () => ({
+  buildTimelineShiftPlan: vi.fn(),
+}));
+
+vi.mock("../router/timeline-project-read-support.js", () => ({
+  buildTimelineShiftValidationBookings: vi.fn(),
+}));
+
+vi.mock("../router/timeline-read-shared.js", async () => {
+  const actual = await vi.importActual<typeof import("../router/timeline-read-shared.js")>(
+    "../router/timeline-read-shared.js",
+  );
+
+  return {
+    ...actual,
+    getAssignmentResourceIds: vi.fn(),
+  };
+});
+
+vi.mock("../router/timeline-shift-support.js", () => ({
+  buildTimelineProjectShiftValidation: vi.fn(),
+}));
+
+import { listAssignmentBookings } from "@capakraken/application";
+import { loadProjectPlanningReadModel } from "../router/project-planning-read-model.js";
+import {
+  loadProjectShiftContext,
+  loadTimelineProjectContext,
+  previewTimelineProjectShift,
+} from "../router/timeline-project-load-support.js";
+import { findTimelineProjectOrThrow } from "../router/timeline-project-query-support.js";
+import { buildTimelineShiftPlan } from "../router/timeline-shift-planning.js";
+import { buildTimelineShiftValidationBookings } from "../router/timeline-project-read-support.js";
+import { getAssignmentResourceIds } from "../router/timeline-read-shared.js";
+import { buildTimelineProjectShiftValidation } from "../router/timeline-shift-support.js";
+
+const findTimelineProjectOrThrowMock = vi.mocked(findTimelineProjectOrThrow);
+const loadProjectPlanningReadModelMock = vi.mocked(loadProjectPlanningReadModel);
+const listAssignmentBookingsMock = vi.mocked(listAssignmentBookings);
+const getAssignmentResourceIdsMock = vi.mocked(getAssignmentResourceIds);
+const buildTimelineShiftValidationBookingsMock = vi.mocked(buildTimelineShiftValidationBookings);
+const buildTimelineShiftPlanMock = vi.mocked(buildTimelineShiftPlan);
+const buildTimelineProjectShiftValidationMock = vi.mocked(buildTimelineProjectShiftValidation);
+
+describe("timeline project load support", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("loads shift context with booking windows when assignment resources exist", async () => {
+    findTimelineProjectOrThrowMock.mockResolvedValueOnce({ id: "project_1" } as never);
+    loadProjectPlanningReadModelMock.mockResolvedValueOnce({
+      demandRequirements: [{ id: "demand_1" }],
+      assignments: [{ id: "assignment_1" }],
+      readModel: {
+        allocations: [],
+        demands: [],
+        assignments: [{ resourceId: "resource_1" }],
+      },
+    } as never);
+    getAssignmentResourceIdsMock.mockReturnValueOnce(["resource_1"]);
+    listAssignmentBookingsMock.mockResolvedValueOnce([{ id: "booking_1" }] as never);
+    buildTimelineShiftValidationBookingsMock.mockReturnValueOnce([{ id: "window_1" }] as never);
+    buildTimelineShiftPlanMock.mockReturnValueOnce({ shifts: 1 } as never);
+
+    await expect(loadProjectShiftContext({} as never, "project_1")).resolves.toEqual({
+      project: { id: "project_1" },
+      demandRequirements: [{ id: "demand_1" }],
+      assignments: [{ id: "assignment_1" }],
+      shiftPlan: { shifts: 1 },
+    });
+
+    expect(listAssignmentBookingsMock).toHaveBeenCalledWith({}, {
+      resourceIds: ["resource_1"],
+    });
+    expect(buildTimelineShiftValidationBookingsMock).toHaveBeenCalledWith([{ id: "booking_1" }]);
+    expect(buildTimelineShiftPlanMock).toHaveBeenCalledWith({
+      demandRequirements: [{ id: "demand_1" }],
+      assignments: [{ id: "assignment_1" }],
+      allAssignmentWindows: [{ id: "window_1" }],
+    });
+  });
+
+  it("loads project context and skips booking lookup without assignment resources", async () => {
+    findTimelineProjectOrThrowMock.mockResolvedValueOnce({
+      id: "project_1",
+      startDate: new Date("2026-04-01T00:00:00.000Z"),
+      endDate: new Date("2026-04-10T00:00:00.000Z"),
+    } as never);
+    loadProjectPlanningReadModelMock.mockResolvedValueOnce({
+      readModel: {
+        allocations: [{ id: "allocation_1" }],
+        demands: [{ id: "demand_1" }],
+        assignments: [{ id: "assignment_1" }],
+      },
+    } as never);
+    getAssignmentResourceIdsMock.mockReturnValueOnce([]);
+
+    await expect(loadTimelineProjectContext({} as never, "project_1")).resolves.toEqual({
+      project: {
+        id: "project_1",
+        startDate: new Date("2026-04-01T00:00:00.000Z"),
+        endDate: new Date("2026-04-10T00:00:00.000Z"),
+      },
+      allocations: [{ id: "allocation_1" }],
+      demands: [{ id: "demand_1" }],
+      assignments: [{ id: "assignment_1" }],
+      allResourceAllocations: [],
+      resourceIds: [],
+    });
+
+    expect(listAssignmentBookingsMock).not.toHaveBeenCalled();
+  });
+
+  it("builds project shift previews from loaded context", async () => {
+    findTimelineProjectOrThrowMock.mockResolvedValueOnce({ id: "project_1" } as never);
+    loadProjectPlanningReadModelMock.mockResolvedValueOnce({
+      demandRequirements: [{ id: "demand_1" }],
+      assignments: [{ id: "assignment_1" }],
+      readModel: {
+        allocations: [],
+        demands: [],
+        assignments: [{ resourceId: null }],
+      },
+    } as never);
+    getAssignmentResourceIdsMock.mockReturnValueOnce([]);
+    buildTimelineShiftPlanMock.mockReturnValueOnce({ shifts: [] } as never);
+    buildTimelineProjectShiftValidationMock.mockReturnValueOnce({ ok: true } as never);
+
+    await expect(
+      previewTimelineProjectShift({} as never, {
+        projectId: "project_1",
+        newStartDate: new Date("2026-04-02T00:00:00.000Z"),
+        newEndDate: new Date("2026-04-08T00:00:00.000Z"),
+      }),
+    ).resolves.toEqual({ ok: true });
+
+    expect(buildTimelineProjectShiftValidationMock).toHaveBeenCalledWith({
+      context: {
+        project: { id: "project_1" },
+        demandRequirements: [{ id: "demand_1" }],
+        assignments: [{ id: "assignment_1" }],
+        shiftPlan: { shifts: [] },
+      },
+      newStartDate: new Date("2026-04-02T00:00:00.000Z"),
+      newEndDate: new Date("2026-04-08T00:00:00.000Z"),
+    });
+  });
+});
diff --git a/packages/api/src/router/timeline-project-load-support.ts b/packages/api/src/router/timeline-project-load-support.ts
new file mode 100644
index 0000000..2622216
--- /dev/null
+++ b/packages/api/src/router/timeline-project-load-support.ts
@@ -0,0 +1,93 @@
+import { listAssignmentBookings } from "@capakraken/application";
+import { loadProjectPlanningReadModel } from "./project-planning-read-model.js";
+import {
+  findTimelineProjectOrThrow,
+  projectShiftContextSelect,
+  timelineProjectContextSelect,
+} from "./timeline-project-query-support.js";
+import { buildTimelineShiftPlan } from "./timeline-shift-planning.js";
+import { getAssignmentResourceIds, ShiftDbClient } from "./timeline-read-shared.js";
+import { buildTimelineProjectShiftValidation } from "./timeline-shift-support.js";
+import { buildTimelineShiftValidationBookings } from "./timeline-project-read-support.js";
+
+export async function loadProjectShiftContext(db: ShiftDbClient, projectId: string) {
+  const [project, planningRead] = await Promise.all([
+    findTimelineProjectOrThrow(db, {
+      projectId,
+      select: projectShiftContextSelect,
+    }),
+    loadProjectPlanningReadModel(db, { projectId, activeOnly: true }),
+  ]);
+
+  const { demandRequirements, assignments, readModel: projectReadModel } = planningRead;
+
+  const resourceIds = getAssignmentResourceIds(projectReadModel);
+  const allAssignmentWindows =
+    resourceIds.length === 0
+      ? []
+      : buildTimelineShiftValidationBookings(
+          await listAssignmentBookings(db, {
+            resourceIds,
+          }),
+        );
+
+  const shiftPlan = buildTimelineShiftPlan({
+    demandRequirements,
+    assignments,
+    allAssignmentWindows,
+  });
+
+  return {
+    project,
+    demandRequirements,
+    assignments,
+    shiftPlan,
+  };
+}
+
+export async function loadTimelineProjectContext(db: ShiftDbClient, projectId: string) {
+  const [project, planningRead] = await Promise.all([
+    findTimelineProjectOrThrow(db, {
+      projectId,
+      select: timelineProjectContextSelect,
+    }),
+    loadProjectPlanningReadModel(db, {
+      projectId,
+      activeOnly: true,
+    }),
+  ]);
+
+  const resourceIds = getAssignmentResourceIds(planningRead.readModel);
+  const allResourceAllocations =
+    resourceIds.length === 0
+      ? []
+      : await listAssignmentBookings(db, {
+          resourceIds,
+        });
+
+  return {
+    project,
+    allocations: planningRead.readModel.allocations,
+    demands: planningRead.readModel.demands,
+    assignments: planningRead.readModel.assignments,
+    allResourceAllocations,
+    resourceIds,
+  };
+}
+
+export async function previewTimelineProjectShift(
+  db: ShiftDbClient,
+  input: {
+    projectId: string;
+    newStartDate: Date;
+    newEndDate: Date;
+  },
+) {
+  const context = await loadProjectShiftContext(db, input.projectId);
+
+  return buildTimelineProjectShiftValidation({
+    context,
+    newStartDate: input.newStartDate,
+    newEndDate: input.newEndDate,
+  });
+}
diff --git a/packages/api/src/router/timeline-project-read.ts b/packages/api/src/router/timeline-project-read.ts
index d23f64d..63b209c 100644
--- a/packages/api/src/router/timeline-project-read.ts
+++ b/packages/api/src/router/timeline-project-read.ts
@@ -4,10 +4,13 @@ import { ShiftProjectSchema } from "@capakraken/shared";
 import { z } from "zod";
 import { getAnonymizationDirectory } from "../lib/anonymization.js";
 import { controllerProcedure } from "../trpc.js";
-import { loadProjectPlanningReadModel } from "./project-planning-read-model.js";
 import {
   loadTimelineProjectContextDetailArtifacts,
 } from "./timeline-project-context-support.js";
+import {
+  loadTimelineProjectContext,
+  previewTimelineProjectShift,
+} from "./timeline-project-load-support.js";
 import {
   buildTimelineProjectContextDetailResponse,
   buildTimelineProjectContextResponse,
@@ -16,100 +19,12 @@ import {
   buildTimelineBudgetStatusAllocations,
   buildTimelineBudgetStatusResponse,
   buildTimelineShiftPreviewDetailResponse,
-  buildTimelineShiftValidationBookings,
 } from "./timeline-project-read-support.js";
 import {
   findTimelineProjectOrThrow,
-  projectShiftContextSelect,
   timelineBudgetStatusProjectSelect,
-  timelineProjectContextSelect,
   timelineShiftPreviewProjectSelect,
 } from "./timeline-project-query-support.js";
-import { buildTimelineShiftPlan } from "./timeline-shift-planning.js";
-import { getAssignmentResourceIds, ShiftDbClient } from "./timeline-read-shared.js";
-import { buildTimelineProjectShiftValidation } from "./timeline-shift-support.js";
-
-export async function loadProjectShiftContext(db: ShiftDbClient, projectId: string) {
-  const [project, planningRead] = await Promise.all([
-    findTimelineProjectOrThrow(db, {
-      projectId,
-      select: projectShiftContextSelect,
-    }),
-    loadProjectPlanningReadModel(db, { projectId, activeOnly: true }),
-  ]);
-
-  const { demandRequirements, assignments, readModel: projectReadModel } = planningRead;
-
-  const resourceIds = getAssignmentResourceIds(projectReadModel);
-  const allAssignmentWindows =
-    resourceIds.length === 0
-      ? []
-      : buildTimelineShiftValidationBookings(
-          await listAssignmentBookings(db, {
-            resourceIds,
-          }),
-        );
-
-  const shiftPlan = buildTimelineShiftPlan({
-    demandRequirements,
-    assignments,
-    allAssignmentWindows,
-  });
-
-  return {
-    project,
-    demandRequirements,
-    assignments,
-    shiftPlan,
-  };
-}
-
-export async function loadTimelineProjectContext(db: ShiftDbClient, projectId: string) {
-  const [project, planningRead] = await Promise.all([
-    findTimelineProjectOrThrow(db, {
-      projectId,
-      select: timelineProjectContextSelect,
-    }),
-    loadProjectPlanningReadModel(db, {
-      projectId,
-      activeOnly: true,
-    }),
-  ]);
-
-  const resourceIds = getAssignmentResourceIds(planningRead.readModel);
-  const allResourceAllocations =
-    resourceIds.length === 0
-      ? []
-      : await listAssignmentBookings(db, {
-          resourceIds,
-        });
-
-  return {
-    project,
-    allocations: planningRead.readModel.allocations,
-    demands: planningRead.readModel.demands,
-    assignments: planningRead.readModel.assignments,
-    allResourceAllocations,
-    resourceIds,
-  };
-}
-
-export async function previewTimelineProjectShift(
-  db: ShiftDbClient,
-  input: {
-    projectId: string;
-    newStartDate: Date;
-    newEndDate: Date;
-  },
-) {
-  const context = await loadProjectShiftContext(db, input.projectId);
-
-  return buildTimelineProjectShiftValidation({
-    context,
-    newStartDate: input.newStartDate,
-    newEndDate: input.newEndDate,
-  });
-}
 
 export const timelineProjectReadProcedures = {
   getProjectContext: controllerProcedure
diff --git a/packages/api/src/router/timeline.ts b/packages/api/src/router/timeline.ts
index d983eae..1dcb437 100644
--- a/packages/api/src/router/timeline.ts
+++ b/packages/api/src/router/timeline.ts
@@ -3,7 +3,7 @@ import { emitProjectShifted } from "../sse/event-bus.js";
 import { createTRPCRouter, managerProcedure, requirePermission } from "../trpc.js";
 import { timelineAllocationMutationProcedures } from "./timeline-allocation-mutations.js";
 import { timelineReadProcedures } from "./timeline-read.js";
-import { loadProjectShiftContext } from "./timeline-project-read.js";
+import { loadProjectShiftContext } from "./timeline-project-load-support.js";
 import { applyTimelineProjectShift } from "./timeline-shift-support.js";
 
 export const timelineRouter = createTRPCRouter({