Implement daily count extraction and invariance tests

[gelluisaac]

Implement daily count extraction function and tests

• Implement _extract_daily_counts helper function:
  • Convert timestamps to dates (day resolution)
  • Determine first and last transaction dates
  • Create complete date range from first to last
  • Count transactions per day using value_counts
  • Fill missing days with 0
  • Return numpy array of counts
  • Handle edge cases (empty timestamps, single timestamp)
• Write unit tests for _extract_daily_counts:
  • Multiple days with gaps
  • All transactions on same day
  • Single transaction
  • Empty timestamps
  • Days with zero transactions
• Write property test for timestamp order invariance:
  • Shuffle timestamps, verify daily counts are identical
• Requirements: 1.3, 2.2, 6.4

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[adewuyito]

@adewuyito has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Good sir, might i be vested the authority to smite they issue

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[uzochukwuV]

@uzochukwuV has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

hi , i would love to work on this issue, i have done this type of task before

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[anonfedora]

@anonfedora has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I'm Anonfedora, I'm a Fullstack Blockchain Engr. I'm proficient in Rust (soroban), Rust serverside with Axum and tokio, Nestjs, epxressjs have vast experience in contributing and building on the Stellar ecosystem with the Rust using soroban's SDK.
I'm also good at comprehensively testing features.
ETA: < 12 hours

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Congratulations, @adewuyito! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @adewuyito: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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