Working device manager, added folders for better organization.

services/device_manager/db_models.py

@@ -0,0 +1,44 @@
+"""
+SQLAlchemy ORM models for device manager service.
+
+These models mirror the database schema defined in db_migrations.
+Kept separate to make the service independent.
+"""
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Text
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.sql import func
+
+Base = declarative_base()
+
+
+class Device(Base):
+    """IoT devices registered in the system."""
+
+    __tablename__ = "devices"
+
+    id = Column(Text, primary_key=True)
+    name = Column(Text, nullable=False)
+    location = Column(Text)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    def __repr__(self):
+        return f"<Device(id={self.id}, name={self.name})>"
+
+
+class DeviceCertificate(Base):
+    """X.509 certificates issued to devices for mTLS authentication."""
+
+    __tablename__ = "device_certificates"
+
+    device_id = Column(
+        Text, ForeignKey("devices.id", ondelete="CASCADE"), primary_key=True
+    )
+    certificate_pem = Column(Text, nullable=False)
+    private_key_pem = Column(Text)
+    issued_at = Column(DateTime(timezone=True), nullable=False)
+    expires_at = Column(DateTime(timezone=True), nullable=False)
+    revoked_at = Column(DateTime(timezone=True))
+
+    def __repr__(self):
+        return f"<DeviceCertificate(device_id={self.device_id}, expires={self.expires_at})>"