fix(ctl): import pyarrow lazily in the JSON importer

[fatih-acar]

Why

pyarrow was imported at module top-level in the line-delimited JSON importer (infrahub_sdk/transfer/importer/json.py). That module is reached from ctl.cli_commands at infrahubctl startup, so every infrahubctl command required pyarrow (the ctl extra) to be importable — even schema load, menu load, and run, which don't touch pyarrow at all.

This breaks slim installs that intentionally omit the heavy pyarrow dependency (e.g. the Infrahub server container image), where infrahubctl schema load fails at startup with Module pyarrow is not available.

What changed

• Import pyarrow.json lazily inside LineDelimitedJSONImporter.import_data — the only code path that uses it — instead of at module top-level.
• Raise a clear, actionable ModuleNotFoundError (pointing at the ctl extra) if pyarrow is missing when object load actually runs.

Only infrahubctl object load now requires the ctl extra; all other infrahubctl commands work without pyarrow.

How to test

uv sync                      # without the ctl extra (no pyarrow)
infrahubctl schema load --help   # works (previously failed at import)
infrahubctl object load ...      # clear "install the 'ctl' extra" error
uv sync --extra ctl
infrahubctl object load ...      # works

🤖 Generated with Claude Code

---

Summary by cubic

Lazy-load pyarrow in the line-delimited JSON importer so only infrahubctl object load requires the ctl extra; all other infrahubctl commands run without pyarrow. Fixes startup failures on slim installs (e.g., server image) where pyarrow isn’t installed.

• Bug Fixes
  • Moved pyarrow.json import into LineDelimitedJSONImporter.import_data.
  • Added clear ModuleNotFoundError with install hints: pip install 'infrahub-sdk[ctl]' or uv sync --extra ctl.

^{Written for commit e31a1da. Summary will update on new commits.}

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
infrahub_sdk/transfer/importer/json.py	50.00%	2 Missing ⚠️

@@                 Coverage Diff                  @@
##           infrahub-develop    #1160      +/-   ##
====================================================
- Coverage             82.35%   82.34%   -0.01%     
====================================================
  Files                   138      138              
  Lines                 12065    12070       +5     
  Branches               1805     1805              
====================================================
+ Hits                   9936     9939       +3     
- Misses                 1573     1575       +2     
  Partials                556      556              

Flag	Coverage Δ
integration-tests	40.96% <50.00%> (-0.02%)	⬇️
python-3.10	55.79% <0.00%> (-0.02%)	⬇️
python-3.11	55.79% <0.00%> (-0.04%)	⬇️
python-3.12	55.79% <0.00%> (-0.04%)	⬇️
python-3.13	55.79% <0.00%> (-0.04%)	⬇️
python-3.14	55.78% <0.00%> (-0.02%)	⬇️
python-filler-3.12	22.45% <0.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/transfer/importer/json.py	76.02% <50.00%> (-0.90%)	⬇️

... and 4 files with indirect coverage changes

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[cubic-dev-ai]

No issues found across 2 files

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