Enable WAL mode on the database

src/db/migrations/008_wal.ts

@@ -0,0 +1,9 @@
+import { Kysely, sql } from '@/deps.ts';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  await sql`PRAGMA journal_mode = WAL`.execute(db);
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  await sql`PRAGMA journal_mode = DELETE`.execute(db);
+}