Enhanced Cohort Units and Timestamp Handling

• Day: 2025-09-16
• Time: 03:00 to 04:30
• Project: Dev
• Workspace: WP 2: Operational
• Status: In Progress
• Priority: MEDIUM
• Assignee: Matías Nehuen Iglesias
• Tags: Cohorts, Timestamp, CLI, Refactor, Python

Description

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.

Evidence

• source_file=2025-09-16.sessions.jsonl, line_number=6, event_count=0, session_id=f246f1deddc395146425f3dd22ad6e91972d3e7f64c2b534f109db12c9bbfe65
• event_ids: []