test: add DB schema validation (129 tests)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: alexandre-mrt

tests/db-schema.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, test } from "bun:test";
+
+process.env.DATABASE_URL = ":memory:";
+const { db } = await import("../src/services/db");
+
+describe("DB schema", () => {
+	test("drops table exists", () => {
+		const result = db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='drops'").get();
+		expect(result).toBeTruthy();
+	});
+
+	test("drops table has expected columns", () => {
+		const cols = db.prepare("PRAGMA table_info(drops)").all();
+		const names = (cols as Array<{name: string}>).map(c => c.name);
+		expect(names).toContain("id");
+		expect(names).toContain("root_hash");
+		expect(names).toContain("file_name");
+		expect(names).toContain("downloads");
+	});
+});