f03cc6039b
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run_all_aggregations() previously used datetime.now(UTC) for weekly through annual layers while using the trade date only for daily, causing data misalignment on backfill. Now all layers consistently use the latest trade timestamp. Also adds "Z" suffix handling for fromisoformat() compatibility and strengthens test assertions to verify L4-L2 layer values end-to-end. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>