feat(fase3): add Queue and QueueAgent database models

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/api-gateway/app/models/queue.py

@@ -0,0 +1,46 @@
+import uuid
+from datetime import datetime
+from sqlalchemy import Column, String, Boolean, DateTime, Integer, ForeignKey, Enum as SQLEnum
+from sqlalchemy.dialects.postgresql import UUID, JSONB, ARRAY
+from sqlalchemy.orm import relationship
+import enum
+from app.core.database import Base
+
+
+class AssignmentMethod(str, enum.Enum):
+    ROUND_ROBIN = "round_robin"
+    LEAST_BUSY = "least_busy"
+    SKILL_BASED = "skill_based"
+
+
+class Queue(Base):
+    __tablename__ = "queues"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    name = Column(String(100), nullable=False)
+    description = Column(String(500), nullable=True)
+    assignment_method = Column(SQLEnum(AssignmentMethod), default=AssignmentMethod.ROUND_ROBIN, nullable=False)
+    max_per_agent = Column(Integer, default=10, nullable=False)
+    sla_first_response = Column(Integer, default=300, nullable=False)
+    sla_resolution = Column(Integer, default=86400, nullable=False)
+    business_hours = Column(JSONB, default=dict)
+    fallback_flow_id = Column(UUID(as_uuid=True), ForeignKey("flows.id"), nullable=True)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+
+    agents = relationship("QueueAgent", back_populates="queue")
+    conversations = relationship("Conversation", back_populates="queue")
+
+
+class QueueAgent(Base):
+    __tablename__ = "queue_agents"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    queue_id = Column(UUID(as_uuid=True), ForeignKey("queues.id"), nullable=False)
+    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
+    is_supervisor = Column(Boolean, default=False, nullable=False)
+    skills = Column(ARRAY(String), default=list)
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+
+    queue = relationship("Queue", back_populates="agents")
+    user = relationship("User")