these 4 derivations will be built:
  /nix/store/3x34lc9mjjbxa95578h2hq4xfp39sirj-harvest-exporter-0.1.0.drv
  /nix/store/hj6n914633abxyjwiv17s406m0ky425n-treefmt.toml.drv
  /nix/store/n9rp9sg7mh13qrvagcxbvng9054cg3wc-treefmt.drv
  /nix/store/am65m48m62qniw2xg1kjqxfb8hrmza2v-treefmt-check.drv
these 2 paths will be fetched (25.7 KiB download, 100.0 KiB unpacked):
  /nix/store/wbqss1n5g5a9gyhjk9sc8gx60rmbrmmf-python3.14-types-requests-2.32.4.20260107
  /nix/store/z0g4f01f3mvmbdj64nzpgddr0nwb6ys8-python3.14-types-urllib3-1.26.25.14
error: Cannot build '/nix/store/am65m48m62qniw2xg1kjqxfb8hrmza2v-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/rq923253k1m5rg457762nf1nrjisvm2n-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 6.074s
       > Error: failed to finalise formatting: formatting failures detected
       For full logs, run:
         nix log /nix/store/am65m48m62qniw2xg1kjqxfb8hrmza2v-treefmt-check.drv