Remove synthetic CSVs from git history with git-filter-repo

[louismagowan]

Background

PR #794 deleted 8 synthetic CSV files (~172KB) from the repo, but they remain in git history.
Using git-filter-repo would permanently remove them and reduce clone size.

Files to remove from history

• causalpy/data/did.csv
• causalpy/data/regression_discontinuity.csv
• causalpy/data/synthetic_control.csv
• causalpy/data/its.csv
• causalpy/data/its_simple.csv
• causalpy/data/ancova_generated.csv
• causalpy/data/geolift1.csv
• causalpy/data/geolift_multi_cell.csv
• causalpy/data/gt_social_media_data.csv

Trade-offs

Savings: ~172KB reduction in clone size

Cost: All commit hashes rewritten, all open PRs need rebasing, all contributors need to re-clone, external SHA links break.

Given the small savings vs. high disruption, this is low priority and should only be considered at a natural breakpoint (e.g. before a major release).

References

• Raised during review of PR Fix simulate_data.py reproducibility + remove synthetic CSVs  #794, e.g here
• Tool: git-filter-repo