these 4 derivations will be built:
  /nix/store/qllxjnjbmzqnhqjdrvk39vz8jx1vnpff-harvest-exporter-0.1.0.drv
  /nix/store/0aaybqklz63l8xyy7vl4lr97ndxmx624-treefmt.toml.drv
  /nix/store/izakjadjfs783y66ndsnl2i74vssa6za-treefmt.drv
  /nix/store/l0cfndb8xpbpyhb4zzvflyj6dkhlgi50-treefmt-check.drv
these 3 paths will be fetched (52.4 KiB download, 229.3 KiB unpacked):
  /nix/store/ck8kh7phg7y4smg2q898gqsx80vfaghp-python3.14-click-option-group-0.5.9
  /nix/store/d5wsnw0p41bhsssp189vmxwi67v71wlx-python3.14-types-requests-2.32.4.20260107
  /nix/store/yiyfiisd34w9lb865yx1m0267lwsggg6-python3.14-types-urllib3-1.26.25.14
error: Cannot build '/nix/store/l0cfndb8xpbpyhb4zzvflyj6dkhlgi50-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/mg8645dvhd5xhpsy2zq0c5wkljmqgibf-treefmt-check
       Last 25 log lines:
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/db.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/fetch.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/i18n.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/mail.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/model.py:1:1
       >
       > CPY001 Missing copyright notice at top of file
       > --> packages/harvest-invoicer/src/harvest_invoicer/render.py:1:1
       >
       > Found 16 errors (1 fixed, 15 remaining).
       >
       > traversed 200 files
       > emitted 115 files for processing
       > formatted 18 files (1 changed) in 5.927s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/l0cfndb8xpbpyhb4zzvflyj6dkhlgi50-treefmt-check.drv