feat(db): add pure isBanActive predicate matching Laravel ban filtering

packages/db/src/bans/is-ban-active.test.ts

@@ -0,0 +1,22 @@
+import { describe, it, expect } from "vitest";
+import { isBanActive } from "./is-ban-active.js";
+
+describe("isBanActive", () => {
+  const now = 1_700_000_000; // fixed unix seconds
+
+  it("is active when ban_expire is in the future", () => {
+    expect(isBanActive({ banExpire: now + 100 }, now)).toBe(true);
+  });
+
+  it("is inactive when ban_expire is in the past", () => {
+    expect(isBanActive({ banExpire: now - 100 }, now)).toBe(false);
+  });
+
+  it("is inactive when ban_expire equals now (Laravel uses strict >)", () => {
+    expect(isBanActive({ banExpire: now }, now)).toBe(false);
+  });
+
+  it("is inactive for the default 0 expiry", () => {
+    expect(isBanActive({ banExpire: 0 }, now)).toBe(false);
+  });
+});