## Context Wallet stats API for participant profile modal. Parent epic: #238. ## Relevant files - `indexer/src/api.rs` - SQL aggregations over buy, podium payout, XP, CRED, WarBow epochs ## Acceptance criteria API returns: - [ ] `epochs_participated` (Last Buy epochs with ≥1 buy) - [ ] `prizes_won[]`: `{ podium, epoch, rank, amount_doub }` - [ ] `total_won_doub`, `total_spent_doub`, `buy_count` - [ ] `xp`, `level` - [ ] `highest_scores[]`: `{ podium, epoch, score, rank }` for Streak, TimeBooster, WarBow, LastBuy - [ ] Bonus stats: first buy timestamp, longest defended streak, WarBow steals/guards, referral CRED earned, CRED claimed, average buy size, max single buy, podium win rate, rank distribution ## Verification checklist - [ ] Integration test with fixture buys across 2 Last Buy epochs - [ ] p95 query latency acceptable on Anvil-rich dataset