feat: add migration for index on item's deleted at (#2045)

Co-authored-by: kim <kim.phanhoang@epfl.ch>

Author: pyphilia

src/drizzle/0015_item-deleted-at-index.sql

@@ -0,0 +1 @@
+CREATE INDEX "IDX_item_deleted_at" ON "item" USING btree ("deleted_at");