-- Migration: adds AI assistant fields to bots table.
-- Safe to run multiple times (ADD COLUMN IF NOT EXISTS).

ALTER TABLE bots ADD COLUMN IF NOT EXISTS type VARCHAR(50) NOT NULL DEFAULT 'webhook';
ALTER TABLE bots ADD COLUMN IF NOT EXISTS system_prompt TEXT;
ALTER TABLE bots ADD COLUMN IF NOT EXISTS rag_enabled BOOLEAN NOT NULL DEFAULT FALSE;
ALTER TABLE bots ADD COLUMN IF NOT EXISTS rag_top_k INTEGER NOT NULL DEFAULT 5;
ALTER TABLE bots ADD COLUMN IF NOT EXISTS mcp_servers JSONB;
ALTER TABLE bots ADD COLUMN IF NOT EXISTS access_policy JSONB;