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Expert retry loop (max 3 attempts): - On SQL error, re-plans with error context injected - "PREVIOUS ATTEMPTS FAILED" section tells LLM what went wrong - Breaks out of tool sequence on error, retries full plan - Only reports failure after exhausting retries - Recovery test: 13/13 Schema fixes: - geraete: Geraetenummer, Bezeichnung, Beschreibung (were Fabriknummer, Funkkennung) - geraeteverbraeuche: all columns verified - nutzer: all columns verified Action routing: - Button clicks route through PA→Expert in v4 (was missing has_pa check) - WS handler catches exceptions, sends error HUD instead of crashing Nodes panel: - Fixed pipeline order, no re-sorting - Normalized names (pa_v1→pa, expert_eras→eras) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>