feat(16-01): update test helper to seed user and return { db, userId }

- createTestDb uses PGlite with drizzle-pg migrations
- Seeds test user with logtoSub and per-user Uncategorized category
- Returns { db, userId } instead of just db
- Add createSecondTestUser helper for cross-user isolation tests

tests/helpers/db.ts

@@ -1,21 +1,40 @@
-import { Database } from "bun:sqlite";
-import { drizzle } from "drizzle-orm/bun-sqlite";
-import { migrate } from "drizzle-orm/bun-sqlite/migrator";
+import { PGlite } from "@electric-sql/pglite";
+import { drizzle } from "drizzle-orm/pglite";
+import { migrate } from "drizzle-orm/pglite/migrator";
 import * as schema from "../../src/db/schema.ts";
 
-export function createTestDb() {
-	const sqlite = new Database(":memory:");
-	sqlite.run("PRAGMA foreign_keys = ON");
+type Db = ReturnType<typeof drizzle<typeof schema>>;
 
-	const db = drizzle(sqlite, { schema });
+export async function createTestDb() {
+	const client = new PGlite();
+	const db = drizzle(client, { schema });
 
 	// Apply all migrations to create tables
-	migrate(db, { migrationsFolder: "./drizzle" });
+	await migrate(db, { migrationsFolder: "./drizzle-pg" });
 
-	// Seed default Uncategorized category
-	db.insert(schema.categories)
-		.values({ name: "Uncategorized", icon: "package" })
-		.run();
+	// Seed a test user
+	const [user] = await db
+		.insert(schema.users)
+		.values({ logtoSub: "test-user-sub" })
+		.returning();
 
-	return db;
+	// Seed per-user Uncategorized category
+	await db
+		.insert(schema.categories)
+		.values({ name: "Uncategorized", icon: "package", userId: user.id });
+
+	return { db, userId: user.id };
+}
+
+export async function createSecondTestUser(db: Db) {
+	const [user] = await db
+		.insert(schema.users)
+		.values({ logtoSub: "test-user-2-sub" })
+		.returning();
+
+	await db
+		.insert(schema.categories)
+		.values({ name: "Uncategorized", icon: "package", userId: user.id });
+
+	return user.id;
 }