[chore] refactor indexing scripts

src/db/index.ts

@@ -17,6 +17,7 @@ pool.on('error', (err) => {
 });
 
 export const db = drizzle({ client: pool, relations: relations, casing: 'snake_case' });
+export type DBInstance = typeof db;
 
 export const ClosePool = () => {
     pool.end();