Contract 6.19.3

Faster level gaps and trends, and three more tools on the analytical budget. Wire shapes are unchanged.

• Every level gap (mean_level_gap on battles_cards, battles_decks, the two meta tools, players_summary and clans_standings) now reads the opponent's deck level from the battle row, not from a lookup per battle. A clan's season battles_meta_cards went from 8.2 s to 2.3 s, and battles_meta_decks from 6.7 s to 0.4 s. The values are the same.
• battles_trends no longer joins every battle back to the battle table for fields the participant row already carries.
• battles_trends, cards_card and cards_synergy join the analytical reads. They get the larger sort memory, and they return a structured query_timeout with a request id at the 18-second budget instead of racing the function's deadline. war_history was already one of these reads; the limits page now lists it.

Performance; the only behaviour change is which error an over-budget read returns.