[ BOUNTY] Add deterministic seed support to data_generator (#4)

[xcapselx]

Summary

Add deterministic seed support to tools/data_generator.py so generated data can be reproduced exactly from a seed. The existing --seed flag was present but helper functions used the global random module instead of the seeded instance, breaking determinism.

Changes

• tools/data_generator.py:

  • Fixed random_phone(), random_email(), and random_datetime() to accept an optional rng parameter
  • Updated all DataGenerator method call sites to pass self.random to helper functions
  • Changed --seed default from 42 to None (random seed when not specified)
  • Added --print-seed flag to print the seed used so a random run can be reproduced
  • Auto-enable --print-seed when no --seed is supplied
  • Write _metadata.json with seed and parameters in output directory
  • Print reproduction command when --print-seed is active

• tests/test_data_generator_seed.py (new file):

  • test_same_seed_produces_identical_output — same seed = byte-for-byte identical
  • test_different_seeds_produce_different_output — different seeds = different output
  • test_deterministic_across_three_seeds — verifies 3 seeds (42, 123, 999) produce identical hashes across runs
  • test_print_seed_flag_exists — verifies --print-seed flag is recognized
  • test_seed_none_generates_random_seed — verifies default seed is None

• data/README.md:

  • Added "Test Data Generation" section with usage examples for --seed and --print-seed

Testing

python -m unittest tests.test_data_generator_seed -v

Result:

test_deterministic_across_three_seeds ... ok
test_different_seeds_produce_different_output ... ok
test_print_seed_flag_exists ... ok
test_same_seed_produces_identical_output ... ok
test_seed_none_generates_random_seed ... ok

Ran 5 tests in 0.021s
OK

Build diagnostic: diagnostic/build-549809c9.json (encryptly .logd unavailable on Windows; JSON metadata included).

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated (data/README.md)
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

Closes #4

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 94dd05cf-f5d7-4fce-bb5f-ce0581268d99

📥 Commits

Reviewing files that changed from the base of the PR and between 94e0fb0 and 7da0e03.

📒 Files selected for processing (4)

• data/README.md
• diagnostic/build-549809c9.json
• tests/test_data_generator_seed.py
• tools/data_generator.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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