Functioning mqtt ingestion and db write, formating changes, device manager initiated

db_migrations/models.py

@@ -7,42 +7,61 @@ To modify schema:
 3. Review the generated migration in alembic/versions/
 4. Run: alembic upgrade head
 """
-from sqlalchemy import Boolean, Column, Float, ForeignKey, Index,Text, DateTime
+
+from sqlalchemy import Boolean, Column, Float, ForeignKey, Index, Text, DateTime
 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'
-    
+
+    __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)  # Optional: for backup/escrow
+    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})>"
+
+
 class Telemetry(Base):
     """
     Time-series telemetry data from devices.
-    This will be converted to a TimescaleDB hypertable.
     """
-    __tablename__ = 'telemetry'
-    
+
+    __tablename__ = "telemetry"
+
     time = Column(DateTime(timezone=True), primary_key=True, nullable=False)
-    device_id = Column(Text, ForeignKey('devices.id'), primary_key=True, nullable=False)
-    metric = Column(Text, primary_key=True, nullable=False)  # e.g., 'light', 'temperature'
+    device_id = Column(Text, ForeignKey("devices.id"), primary_key=True, nullable=False)
+    metric = Column(Text, primary_key=True, nullable=False)
     value = Column(Float, nullable=False)
     unit = Column(Text)
-    
-    __table_args__ = (
-        Index('idx_telemetry_device_time', 'device_id', 'time'),
-    )
-    
+
+    __table_args__ = (Index("idx_telemetry_device_time", "device_id", "time"),)
+
     def __repr__(self):
         return f"<Telemetry(device={self.device_id}, metric={self.metric}, value={self.value})>"
-