-- Migration 070: optionales OpenRouter-Modell pro Prompt-Zeile
-- Leer/NULL → Umgebungsvariable OPENROUTER_MODEL (wie bisher).

ALTER TABLE ai_prompts ADD COLUMN IF NOT EXISTS openrouter_model VARCHAR(200);

COMMENT ON COLUMN ai_prompts.openrouter_model IS
    'Optional: OpenRouter model id (z.B. anthropic/claude-3.5-haiku); NULL = OPENROUTER_MODEL aus Env';