-- Migration 016: Workflow Support in ai_prompts (Phase 5)
-- Erweitert ai_prompts für type='workflow' (Option B - Backward-kompatibel)

-- Neue Spalte für Workflow-Graphen
ALTER TABLE ai_prompts ADD COLUMN graph_data JSONB;

-- Index für Workflow-Queries
CREATE INDEX IF NOT EXISTS idx_ai_prompts_type ON ai_prompts(type);
CREATE INDEX IF NOT EXISTS idx_ai_prompts_graph_data ON ai_prompts USING GIN (graph_data);

-- Kommentar
COMMENT ON COLUMN ai_prompts.graph_data IS 'Workflow-Graph (nur für type=workflow): {nodes: [...], edges: [...], metadata: {...}}';

-- Beispiel-Struktur (Dokumentation):
-- {
--   "nodes": [
--     {"id": "start", "type": "start", "label": "Start", "position": {"x": 100, "y": 100}},
--     {"id": "analysis_1", "type": "analysis", "prompt_id": 5, "questions": [...], ...},
--     {"id": "logic_1", "type": "logic", "condition": {...}, ...},
--     {"id": "join_1", "type": "join", "join_strategy": "wait_all", ...},
--     {"id": "end", "type": "end", "label": "Ende", "position": {"x": 500, "y": 300}}
--   ],
--   "edges": [
--     {"id": "e1", "source": "start", "target": "analysis_1"},
--     {"id": "e2", "source": "analysis_1", "target": "logic_1"},
--     {"id": "e3", "source": "logic_1", "target": "join_1"},
--     {"id": "e4", "source": "join_1", "target": "end"}
--   ],
--   "metadata": {
--     "created_at": "2026-04-04T12:00:00Z",
--     "version": "1.0"
--   }
-- }

-- Migration erfolgreich