Add firmware update logic

backend/app/models/firmware_update.py

@@ -0,0 +1,20 @@
+import uuid
+from sqlalchemy import Column, DateTime, Enum, ForeignKey, Integer, String, Uuid
+
+from app.database import Base
+from app.schemas.firmware_update import FirmwareUpdateStatus
+
+class FirmwareUpdate(Base):
+    __tablename__ = "firmware_updates"
+
+    id = Column(Uuid, primary_key=True, default=uuid.uuid4)
+    request_id = Column(Integer)
+    status = Column(Enum(FirmwareUpdateStatus))
+
+    retries = Column(Integer)
+    retry_interval = Column(Integer)
+    location = Column(String)
+    retrieve_date_time = Column(DateTime)
+    install_date_time = Column(DateTime, nullable=True)
+
+    chargepoint_id = Column(Uuid, ForeignKey("chargepoints.id"), index=True)