Enhanced Cohort Units and Timestamp Handling

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📅 2025-09-16 — Session: Enhanced Cohort Units and Timestamp Handling

🕒 03:00–04:30
🏷️ Labels: Cohorts, Timestamp, CLI, Refactor, Python
📂 Project: Dev
⭐ Priority: MEDIUM

Session Goal:

The session aimed to enhance cohort unit generation, improve timestamp handling, and refactor CLI components for better data processing and management.

Key Activities:

  • Enhanced Cohort Units Function: Implemented a drop-in replacement for cohort_units_from_logs, allowing flexible cohort generation by time slices (daily, weekly, monthly, session-based) with stable IDs.
  • Timestamp Mismatch Fix: Addressed bugs in timestamp handling by normalizing timestamps in the _bucket_key function and ensuring consistent datetime storage during event ingestion.
  • Data Ingestion and Cohort Bucketing: Improved data ingestion processes for type consistency, aligned loader behaviors, and enhanced cohort bucketing without merging files.
  • Legacy Log Normalization: Revised normalize_log_line function to maintain legacy behavior while ensuring timezone-aware datetime and reducing extras field size.
  • Robust Time Helper Refactor: Refactored time helpers for UTC normalization, preventing formatting issues like +00:00Z.
  • Datetime Handling in Event Class: Standardized datetime representation in the Event class for consistency and safety.
  • Cohort Unit Tagbag Management: Managed time-sliced tagbags and improved CLI usage to avoid parameter confusion.
  • Timestamp Parsing Enhancements: Improved timestamp parsing in select.py with a tolerant UTC parser and overlap semantics.
  • CLI Pruning and Refactoring: Planned CLI refactoring to remove dead code and enhance user experience.

Achievements:

  • Successfully implemented enhancements and refactors across multiple components, improving data handling and processing robustness.
  • Addressed timestamp handling issues, ensuring compatibility with legacy systems.

Pending Tasks:

  • Further testing of CLI enhancements and refactoring strategies to ensure stability and user experience improvements.
  • Continue refining datetime handling in the Event class to cover all edge cases.

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