Lighter odds refreshes

Odds-history and analysis refreshes use less working memory while preserving retained quotes and opening and closing reference rules.

Less memory during refreshes

Odds-history updates copy changed records instead of duplicating the entire history. History and analysis uploads are written in smaller pieces, reducing memory pressure during refreshes. This addresses a source of interrupted odds collection as history grows.

The same reference data

The change preserves retained quotes, market coverage, and the rules used for opening and closing references. Local validation checked that retained quote data stays the same. It does not establish a production speed or reliability guarantee.

Availability

These backend changes are merged into main. Availability depends on service deployment; production memory use and recovery after deployment have not been verified.