update:database persist

backend/drizzle.config.ts

@@ -5,6 +5,6 @@ export default defineConfig({
   out:    './drizzle',
   dialect: 'sqlite',
   dbCredentials: {
-    url: 'file:app.db',
+    url: `file:${process.env.DB_PATH ?? 'app.db'}`,
   },
 })

backend/src/db/index.ts

@@ -2,5 +2,5 @@ import { Database } from 'bun:sqlite'
 import { drizzle } from 'drizzle-orm/bun-sqlite'
 import { tickets, users, sessions, ticketReplies } from './schema.ts'
 
-const sqlite = new Database('app.db')
+const sqlite = new Database(process.env.DB_PATH ?? 'app.db')
 export const db = drizzle(sqlite, { schema: { tickets, users, sessions, ticketReplies } })