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Backend (patterns.py): - POST /api/patterns/find-similar — GPT-4o-mini compares a library pattern against all others; returns merge_as_instance | counter_scenario | new_pattern - POST /api/patterns/merge — full transactional merge: remaps pattern_id in pattern_score_history, trade_entry_prices, ai_reasoning_traces, ai_call_logs, skipped_trades; unions historical_instances (dedup); sums backtest counters; deletes the discarded pattern Frontend (PatternExplorer.tsx + useApi.ts): - ScanSearch button on each non-builtin card triggers find-similar - Inline result panel: duplicate → merge CTA with confirmation + destructive warning counter_scenario → apply regime_tag CTA; new_pattern → green "unique" badge - useFindSimilarPattern + useMergePatterns hooks invalidate all-patterns on success Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>