-- ============================================================================
-- Schema: trading
-- Table: watchlist_items
-- Description: Items individuales dentro de watchlists
-- Dependencies: trading.watchlists, trading.symbols
-- ============================================================================

CREATE TABLE trading.watchlist_items (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  -- Referencias
  watchlist_id UUID NOT NULL REFERENCES trading.watchlists(id) ON DELETE CASCADE,
  symbol_id UUID NOT NULL REFERENCES trading.symbols(id) ON DELETE CASCADE,

  -- Configuración personalizada
  notes TEXT,
  alert_price_high DECIMAL(20,8),
  alert_price_low DECIMAL(20,8),

  -- Ordenamiento
  display_order INTEGER DEFAULT 0,

  -- Timestamps
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

  -- Constraint: un símbolo solo una vez por watchlist
  CONSTRAINT uq_watchlist_items_watchlist_symbol UNIQUE (watchlist_id, symbol_id)
);

-- Índices
CREATE INDEX idx_watchlist_items_watchlist ON trading.watchlist_items(watchlist_id);
CREATE INDEX idx_watchlist_items_symbol ON trading.watchlist_items(symbol_id);

-- Comentarios
COMMENT ON TABLE trading.watchlist_items IS 'Símbolos individuales dentro de una watchlist';
COMMENT ON COLUMN trading.watchlist_items.alert_price_high IS 'Precio superior para alertas';
COMMENT ON COLUMN trading.watchlist_items.alert_price_low IS 'Precio inferior para alertas';