refactor(api): extract timeline batch shift support

packages/api/src/__tests__/timeline-allocation-batch-shift-support.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from "vitest";
+import {
+  buildTimelineBatchShiftAuditChanges,
+  shiftTimelineAllocationWindow,
+} from "../router/timeline-allocation-batch-shift-support.js";
+
+describe("timeline allocation batch shift support", () => {
+  it("shifts and clamps allocation windows for each batch-shift mode", () => {
+    expect(
+      shiftTimelineAllocationWindow({
+        startDate: new Date("2026-04-10T00:00:00.000Z"),
+        endDate: new Date("2026-04-12T00:00:00.000Z"),
+        daysDelta: 2,
+        mode: "move",
+      }),
+    ).toEqual({
+      startDate: new Date("2026-04-12T00:00:00.000Z"),
+      endDate: new Date("2026-04-14T00:00:00.000Z"),
+    });
+
+    expect(
+      shiftTimelineAllocationWindow({
+        startDate: new Date("2026-04-10T00:00:00.000Z"),
+        endDate: new Date("2026-04-12T00:00:00.000Z"),
+        daysDelta: 5,
+        mode: "resize-start",
+      }),
+    ).toEqual({
+      startDate: new Date("2026-04-12T00:00:00.000Z"),
+      endDate: new Date("2026-04-12T00:00:00.000Z"),
+    });
+
+    expect(
+      shiftTimelineAllocationWindow({
+        startDate: new Date("2026-04-10T00:00:00.000Z"),
+        endDate: new Date("2026-04-12T00:00:00.000Z"),
+        daysDelta: -5,
+        mode: "resize-end",
+      }),
+    ).toEqual({
+      startDate: new Date("2026-04-10T00:00:00.000Z"),
+      endDate: new Date("2026-04-10T00:00:00.000Z"),
+    });
+  });
+
+  it("builds batch-shift audit payloads", () => {
+    expect(
+      buildTimelineBatchShiftAuditChanges({
+        mode: "move",
+        daysDelta: 3,
+        count: 2,
+      }),
+    ).toEqual({
+      operation: "batchShift",
+      mode: "move",
+      daysDelta: 3,
+      count: 2,
+    });
+  });
+});

packages/api/src/__tests__/timeline-allocation-mutation-support.test.ts

@@ -4,8 +4,6 @@ import {
   assertTimelineDateRangeValid,
   buildTimelineAllocationEntryUpdate,
   buildTimelineAllocationMetadata,
-  buildTimelineBatchShiftAuditChanges,
-  shiftTimelineAllocationWindow,
   validateTimelineAllocationDateRanges,
 } from "../router/timeline-allocation-mutation-support.js";
 
@@ -36,59 +34,6 @@ describe("timeline allocation mutation support", () => {
       )).toThrowError(TRPCError);
   });
 
-  it("shifts and clamps allocation windows for each batch-shift mode", () => {
-    expect(
-      shiftTimelineAllocationWindow({
-        startDate: new Date("2026-04-10T00:00:00.000Z"),
-        endDate: new Date("2026-04-12T00:00:00.000Z"),
-        daysDelta: 2,
-        mode: "move",
-      }),
-    ).toEqual({
-      startDate: new Date("2026-04-12T00:00:00.000Z"),
-      endDate: new Date("2026-04-14T00:00:00.000Z"),
-    });
-
-    expect(
-      shiftTimelineAllocationWindow({
-        startDate: new Date("2026-04-10T00:00:00.000Z"),
-        endDate: new Date("2026-04-12T00:00:00.000Z"),
-        daysDelta: 5,
-        mode: "resize-start",
-      }),
-    ).toEqual({
-      startDate: new Date("2026-04-12T00:00:00.000Z"),
-      endDate: new Date("2026-04-12T00:00:00.000Z"),
-    });
-
-    expect(
-      shiftTimelineAllocationWindow({
-        startDate: new Date("2026-04-10T00:00:00.000Z"),
-        endDate: new Date("2026-04-12T00:00:00.000Z"),
-        daysDelta: -5,
-        mode: "resize-end",
-      }),
-    ).toEqual({
-      startDate: new Date("2026-04-10T00:00:00.000Z"),
-      endDate: new Date("2026-04-10T00:00:00.000Z"),
-    });
-  });
-
-  it("builds batch-shift audit payloads", () => {
-    expect(
-      buildTimelineBatchShiftAuditChanges({
-        mode: "move",
-        daysDelta: 3,
-        count: 2,
-      }),
-    ).toEqual({
-      operation: "batchShift",
-      mode: "move",
-      daysDelta: 3,
-      count: 2,
-    });
-  });
-
   it("validates date ranges in bulk", () => {
     expect(() =>
       validateTimelineAllocationDateRanges([

packages/api/src/router/timeline-allocation-batch-shift-support.ts

@@ -0,0 +1,47 @@
+import { Prisma } from "@capakraken/db";
+
+export type TimelineBatchShiftMode = "move" | "resize-start" | "resize-end";
+
+export function shiftTimelineAllocationWindow(input: {
+  startDate: Date;
+  endDate: Date;
+  daysDelta: number;
+  mode: TimelineBatchShiftMode;
+}): { startDate: Date; endDate: Date } {
+  const startDate = new Date(input.startDate);
+  const endDate = new Date(input.endDate);
+
+  if (input.mode === "move") {
+    startDate.setDate(startDate.getDate() + input.daysDelta);
+    endDate.setDate(endDate.getDate() + input.daysDelta);
+    return { startDate, endDate };
+  }
+
+  if (input.mode === "resize-start") {
+    startDate.setDate(startDate.getDate() + input.daysDelta);
+    if (startDate > endDate) {
+      startDate.setTime(endDate.getTime());
+    }
+    return { startDate, endDate };
+  }
+
+  endDate.setDate(endDate.getDate() + input.daysDelta);
+  if (endDate < startDate) {
+    endDate.setTime(startDate.getTime());
+  }
+
+  return { startDate, endDate };
+}
+
+export function buildTimelineBatchShiftAuditChanges(input: {
+  mode: TimelineBatchShiftMode;
+  daysDelta: number;
+  count: number;
+}): Prisma.InputJsonValue {
+  return {
+    operation: "batchShift",
+    mode: input.mode,
+    daysDelta: input.daysDelta,
+    count: input.count,
+  } as unknown as Prisma.InputJsonValue;
+}

packages/api/src/router/timeline-allocation-mutation-support.ts

@@ -1,8 +1,5 @@
-import { Prisma } from "@capakraken/db";
 import { TRPCError } from "@trpc/server";
 
-export type TimelineBatchShiftMode = "move" | "resize-start" | "resize-end";
-
 export function assertTimelineDateRangeValid(startDate: Date, endDate: Date): void {
   if (endDate >= startDate) {
     return;
@@ -39,37 +36,6 @@ export function validateTimelineAllocationDateRanges(
   }
 }
 
-export function shiftTimelineAllocationWindow(input: {
-  startDate: Date;
-  endDate: Date;
-  daysDelta: number;
-  mode: TimelineBatchShiftMode;
-}): { startDate: Date; endDate: Date } {
-  const startDate = new Date(input.startDate);
-  const endDate = new Date(input.endDate);
-
-  if (input.mode === "move") {
-    startDate.setDate(startDate.getDate() + input.daysDelta);
-    endDate.setDate(endDate.getDate() + input.daysDelta);
-    return { startDate, endDate };
-  }
-
-  if (input.mode === "resize-start") {
-    startDate.setDate(startDate.getDate() + input.daysDelta);
-    if (startDate > endDate) {
-      startDate.setTime(endDate.getTime());
-    }
-    return { startDate, endDate };
-  }
-
-  endDate.setDate(endDate.getDate() + input.daysDelta);
-  if (endDate < startDate) {
-    endDate.setTime(startDate.getTime());
-  }
-
-  return { startDate, endDate };
-}
-
 export function buildTimelineAllocationUpdateAuditChanges(input: {
   allocationId: string;
   previousHoursPerDay: number;
@@ -80,7 +46,7 @@ export function buildTimelineAllocationUpdateAuditChanges(input: {
   nextStartDate: Date;
   nextEndDate: Date;
   includeSaturday: boolean;
-}): Prisma.InputJsonValue {
+}) {
   return {
     before: {
       id: input.allocationId,
@@ -95,7 +61,7 @@ export function buildTimelineAllocationUpdateAuditChanges(input: {
       endDate: input.nextEndDate,
       includeSaturday: input.includeSaturday,
     },
-  } as unknown as Prisma.InputJsonValue;
+  } as const;
 }
 
 export function buildTimelineAllocationEntryUpdate(input: {
@@ -124,16 +90,3 @@ export function buildTimelineAllocationEntryUpdate(input: {
     },
   };
 }
-
-export function buildTimelineBatchShiftAuditChanges(input: {
-  mode: TimelineBatchShiftMode;
-  daysDelta: number;
-  count: number;
-}): Prisma.InputJsonValue {
-  return {
-    operation: "batchShift",
-    mode: input.mode,
-    daysDelta: input.daysDelta,
-    count: input.count,
-  } as unknown as Prisma.InputJsonValue;
-}

packages/api/src/router/timeline-allocation-shift-support.ts

@@ -5,7 +5,7 @@ import {
   buildTimelineBatchShiftAuditChanges,
   shiftTimelineAllocationWindow,
   type TimelineBatchShiftMode,
-} from "./timeline-allocation-mutation-support.js";
+} from "./timeline-allocation-batch-shift-support.js";
 
 export async function applyTimelineBatchAllocationShift(input: {
   db: PrismaClient;