FEAT: Adicionado tabela para validar atividade do agente

database/migrations/015_agent_presence_pause.sql

@@ -0,0 +1,52 @@
+-- ============================================================
+-- Migration 015: Presenca do agente e reserva de chamados em pausa
+-- Tabelas:
+--   agent_presence
+--   whatsapp_chat_atribuicoes
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS agent_presence (
+  user_id INTEGER PRIMARY KEY REFERENCES usuarios(id) ON DELETE CASCADE,
+  status VARCHAR(40) NOT NULL DEFAULT 'offline',
+  paused_at TIMESTAMP WITH TIME ZONE,
+  last_seen_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1
+    FROM pg_constraint
+    WHERE conname = 'chk_agent_presence_status'
+  ) THEN
+    ALTER TABLE agent_presence
+      ADD CONSTRAINT chk_agent_presence_status
+      CHECK (status IN ('available', 'paused', 'offline'));
+  END IF;
+END $$;
+
+INSERT INTO agent_presence (user_id, status, last_seen_at, updated_at)
+SELECT id, 'available', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
+FROM usuarios
+ON CONFLICT (user_id) DO NOTHING;
+
+ALTER TABLE whatsapp_chat_atribuicoes
+  ADD COLUMN IF NOT EXISTS reserved_user_id INTEGER REFERENCES usuarios(id) ON DELETE SET NULL,
+  ADD COLUMN IF NOT EXISTS reserved_at TIMESTAMP WITH TIME ZONE,
+  ADD COLUMN IF NOT EXISTS pause_released_at TIMESTAMP WITH TIME ZONE;
+
+CREATE INDEX IF NOT EXISTS idx_agent_presence_status
+  ON agent_presence (status);
+
+CREATE INDEX IF NOT EXISTS idx_agent_presence_paused_at
+  ON agent_presence (paused_at)
+  WHERE status = 'paused';
+
+CREATE INDEX IF NOT EXISTS idx_whatsapp_atribuicoes_reserved_user
+  ON whatsapp_chat_atribuicoes (reserved_user_id, status)
+  WHERE reserved_user_id IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_whatsapp_atribuicoes_reserved_queue
+  ON whatsapp_chat_atribuicoes (area_id, status, reserved_user_id)
+  WHERE status = 'queued';