Add migration to fix peminjaman.id_buku foreign key: modify column to INT UNSIGNED and re-create FK referencing buku.id_buku with cascadeOnDelete. Update admin peminjaman blades to use $b->id_buku for option values. Remove unused imports and tidy up formatting/whitespace in Peminjaman and AdminPeminjaman controllers (including small reformat of Fonnte API payload). These changes ensure the dropdowns use the correct book identifier and the DB relation is consistent.
wardhatul1765
Lutfi Hakim