fix: fix bug in rebalanace, stale session values being read

api/tests/variable-categories.manual-rebalance.test.ts

@@ -44,6 +44,37 @@ describe("manual rebalance", () => {
     await seedBasics();
   });
 
+  it("uses live category balances when session availableCents is stale", async () => {
+    await prisma.budgetSession.updateMany({
+      where: { userId: U },
+      data: { availableCents: 1234n },
+    });
+
+    const getRes = await request(app.server)
+      .get("/variable-categories/manual-rebalance")
+      .set("x-user-id", U);
+
+    expect(getRes.statusCode).toBe(200);
+    expect(getRes.body?.availableCents).toBe(10_000);
+
+    const cats = await prisma.variableCategory.findMany({ where: { userId: U }, orderBy: { priority: "asc" } });
+    const targets = cats.map((c) => ({ id: c.id, targetCents: 2500 })); // 4 * 2500 = 10000
+    const postRes = await request(app.server)
+      .post("/variable-categories/manual-rebalance")
+      .set("x-user-id", U)
+      .send({ targets });
+
+    expect(postRes.statusCode).toBe(200);
+    expect(postRes.body?.availableCents).toBe(10_000);
+
+    const session = await prisma.budgetSession.findFirst({
+      where: { userId: U },
+      orderBy: { periodStart: "desc" },
+      select: { availableCents: true },
+    });
+    expect(Number(session?.availableCents ?? 0n)).toBe(10_000);
+  });
+
   it("rebalances when sums match available", async () => {
     const cats = await prisma.variableCategory.findMany({ where: { userId: U }, orderBy: { priority: "asc" } });
     const targets = cats.map((c) => ({ id: c.id, targetCents: 2500 })); // 4 * 2500 = 10000