-- =====================================================
-- LLM SCHEMA - CONVERSATIONS TABLE
-- =====================================================
-- Description: Chat conversations with LLM agent
-- Schema: llm
-- Author: Database Agent
-- Date: 2025-12-06
-- =====================================================

CREATE TABLE llm.conversations (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  -- Usuario
  user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,

  -- Identificación
  title VARCHAR(200), -- Auto-generado o definido por usuario

  -- Tipo y contexto
  conversation_type llm.conversation_type DEFAULT 'general',

  -- Estado
  status llm.conversation_status DEFAULT 'active',

  -- Resumen de conversación (generado por LLM)
  summary TEXT,

  -- Metadata
  total_messages INTEGER DEFAULT 0,
  total_tokens_used INTEGER DEFAULT 0,

  -- Tags para búsqueda
  tags TEXT[] DEFAULT '{}',

  -- Contexto de negocio
  related_symbols VARCHAR(20)[] DEFAULT '{}', -- Símbolos discutidos
  related_topics TEXT[] DEFAULT '{}', -- Temas discutidos

  -- Fechas
  started_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  last_message_at TIMESTAMPTZ,
  archived_at TIMESTAMPTZ,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Índices
CREATE INDEX idx_conversations_user ON llm.conversations(user_id);
CREATE INDEX idx_conversations_status ON llm.conversations(status);
CREATE INDEX idx_conversations_type ON llm.conversations(conversation_type);
CREATE INDEX idx_conversations_active ON llm.conversations(user_id, last_message_at DESC)
  WHERE status = 'active';
CREATE INDEX idx_conversations_tags ON llm.conversations USING GIN(tags);
CREATE INDEX idx_conversations_symbols ON llm.conversations USING GIN(related_symbols);

-- Comentarios
COMMENT ON TABLE llm.conversations IS 'Chat conversations between users and LLM agent';
COMMENT ON COLUMN llm.conversations.title IS 'Conversation title (auto-generated from first messages or user-defined)';
COMMENT ON COLUMN llm.conversations.summary IS 'AI-generated summary of conversation content';
COMMENT ON COLUMN llm.conversations.total_tokens_used IS 'Cumulative token count for cost tracking';
COMMENT ON COLUMN llm.conversations.related_symbols IS 'Trading symbols mentioned in conversation';
COMMENT ON COLUMN llm.conversations.related_topics IS 'Topics discussed (e.g., technical_analysis, risk_management)';