feat: implement multiple file support in Dataset

[Abdeali099]

No description provided.

[Abdeali099]

Can add here something like, Order can be made of multiple files.

make separator constant

[greptile-apps]

Confidence Score: 4/5

Safe to merge after restoring per-row file type validation; all other changes are well-structured.

One P1 finding: the SUPPORTED_FILE_TYPES guard was removed without replacement, meaning unsupported file types silently pass validation and only fail during background job execution. All other findings are P2 style/UX suggestions. Restoring the validation check in validate_files would bring this to 5/5.

parser_benchmark_dataset.py — the validate_files method needs a per-row file type check restored.

Important Files Changed

Filename	Overview
transaction_parser/parser_benchmark/doctype/parser_benchmark_dataset/parser_benchmark_dataset.py	Core model refactored from single-file to child-table; file type validation was removed without replacement, creating a regression where unsupported file types pass validation and only fail at background job execution time.
transaction_parser/parser_benchmark/doctype/parser_benchmark_dataset/parser_benchmark_dataset.json	DocType fields migrated from single Attach+Data to a child Table; the depends_on visibility guard for the PDF Processor section was dropped, making it permanently visible regardless of uploaded file types.
transaction_parser/parser_benchmark/runner.py	Runner updated to iterate over multiple file docs and join content with a separator; logic is clean and the empty-list guard in _get_file_docs prevents IndexError.
transaction_parser/patches/populate_dataset_files_table.py	Migration patch correctly reads previously-attached File docs and inserts them as child rows; uses db_insert() which is appropriate for a data migration patch.
transaction_parser/patches/remove_dataset_file_field.py	Pre-model-sync patch ensures File docs are properly linked before the old file column is dropped; handles orphan and missing File docs gracefully.

_{Reviews (1): Last reviewed commit: "refactor: enhance Parser Benchmark Datas..." | Re-trigger Greptile}