these 4 derivations will be built:
  /nix/store/bhjdif8difc43hr8cljvl9vkx8gvf5jk-harvest-exporter-0.1.0.drv
  /nix/store/1gyl7dam0nzywhq6ziby25iz17882riz-treefmt.toml.drv
  /nix/store/57c9jzw5kdh3wkd6wd4d5hsrv0z891qb-treefmt.drv
  /nix/store/6mz8cab637l2mrh85xh8q0cmbh9gsahr-treefmt-check.drv
these 2 paths will be fetched (25.7 KiB download, 100.0 KiB unpacked):
  /nix/store/4lfkl9bcard9rp4lx0f8l27my31ikbah-python3.14-types-requests-2.32.4.20260107
  /nix/store/xr09wffyfa2vfrvwdx4z8nbkv3hs4q65-python3.14-types-urllib3-1.26.25.14
error: Cannot build '/nix/store/6mz8cab637l2mrh85xh8q0cmbh9gsahr-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/jyb519ddn2vdskxp22pzsp0dvzh2952x-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 8.24s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/6mz8cab637l2mrh85xh8q0cmbh9gsahr-treefmt-check.drv