test: add DB index and journal mode tests (131 tests)

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

Author: alexandre-mrt

tests/db-indexes.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, test } from "bun:test";
+
+process.env.DATABASE_URL = ":memory:";
+const { db } = await import("../src/services/db");
+
+describe("DB indexes", () => {
+	test("has index on drops.id", () => {
+		const indexes = db.prepare("PRAGMA index_list(drops)").all();
+		expect((indexes as any[]).length).toBeGreaterThan(0);
+	});
+
+	test("journal mode is set", () => {
+		const result = db.prepare("PRAGMA journal_mode").get() as { journal_mode: string };
+		expect(["wal","memory"]).toContain(result.journal_mode);
+	});
+});