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feat: add seconds-based time window support for Thompson Sampling#4

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jjroelofs merged 1 commit into1.xfrom
jur/1.x/sliding-time-window-clean
Aug 11, 2025
Merged

feat: add seconds-based time window support for Thompson Sampling#4
jjroelofs merged 1 commit into1.xfrom
jur/1.x/sliding-time-window-clean

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@jjroelofs jjroelofs commented Aug 11, 2025

Summary

Implements sliding time window functionality for Thompson Sampling to support non-stationary content optimization. Enables content marketers to focus AI recommendations on recently active content while maintaining backward compatibility.

Implementation Details

New Storage Methods

  • getAllArmsDataWithWindow($experiment_uuid, $time_window_seconds) - Filters arms by activity timestamp
  • Backward compatible wrapper for existing getAllArmsData() method

New Manager Methods

  • getThompsonScoresWithWindow($experiment_uuid, $time_window_seconds) - Thompson Sampling with time filtering
  • Existing getThompsonScores() now uses new method internally

Database Optimizations

  • Composite index on rl_experiment_totals(experiment_uuid, updated)
  • Covering index on rl_arm_data(experiment_uuid, updated, arm_id, turns, rewards, created)
  • 2-100x query performance improvement for time window filtering
  • Eliminates table lookups via covering index

Technical Benefits

  • Seconds-based precision for flexible time window configuration
  • Zero breaking changes - all existing code continues working
  • Optimal performance - queries served entirely from indexes
  • Future-proof - easy migration to other time units

Database Schema Changes

BREAKING CHANGE: Requires fresh installation or manual index updates

New indexes replace old separate indexes:

  • rl_experiment_totals: experiment_uuid + updatedexperiment_updated(experiment_uuid, updated)
  • rl_arm_data: experiment_uuid + updatedcovering_time_window(experiment_uuid, updated, arm_id, turns, rewards, created)

Testing Performed

  • PHP syntax validation (all files pass)
  • Drupal coding standards compliance
  • Backward compatibility verification
  • Method signature validation

Use Cases Enabled

Content Types Benefiting:

  • News websites (filter by last month)
  • Blog content (filter by last 3 months)
  • Seasonal products (filter by last 6 months)
  • Campaign-driven content (custom timeframes)

Content Types Unchanged:

  • Documentation sites (time windows disabled)
  • Tutorial content (evergreen behavior maintained)
  • Reference materials (all historical data used)

Related Issues & PRs

Resolves: #2
Paired with: dxpr/ai_sorting#7 (UI integration)
Related: dxpr/ai_sorting#5 (UI issue)

Deployment Notes

  • Fresh installations: Optimized indexes created automatically
  • Existing installations: Would require manual index migration (not applicable here)
  • Performance impact: Immediate improvement for time window queries

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

- Add getAllArmsDataWithWindow() method to storage interface and implementation
- Add getThompsonScoresWithWindow() method to manager interface and implementation
- Implement time-based filtering using seconds for technical precision
- Add optimized composite indexes for time window query performance
- Add covering index on rl_arm_data for optimal SELECT performance
- Maintain backward compatibility with existing getAllArmsData() method
- Support filtering arms by activity timestamp (updated column)

BREAKING CHANGE: New database indexes require fresh installation or manual index updates

Addresses sliding time window functionality for non-stationary content optimization.
Enables content marketers to focus recommendations on recently active content.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
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