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backend/app/models/metric.py

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+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import DateTime, Float, ForeignKey, Index, Integer, String, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from ..core.db import Base
+
+
+class DeviceMetric(Base):
+    __tablename__ = "device_metrics"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    device_id: Mapped[int] = mapped_column(
+        ForeignKey("devices.id", ondelete="CASCADE"), nullable=False, index=True
+    )
+    cpu_load: Mapped[float | None] = mapped_column(Float)
+    mem_used_pct: Mapped[float | None] = mapped_column(Float)
+    free_memory: Mapped[int | None] = mapped_column(Integer)
+    total_memory: Mapped[int | None] = mapped_column(Integer)
+    uptime_seconds: Mapped[int | None] = mapped_column(Integer)
+    internet_ok: Mapped[bool | None] = mapped_column()
+    rx_bps: Mapped[int | None] = mapped_column(Integer)
+    tx_bps: Mapped[int | None] = mapped_column(Integer)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), nullable=False, index=True
+    )
+
+    __table_args__ = (
+        Index("ix_device_metrics_device_time", "device_id", "created_at"),
+    )