Initial Switch to V2. Completely Overhauled Backend, Frontend and General Structure.

backend/devices/orm.py

@@ -0,0 +1,31 @@
+from datetime import datetime, timezone
+from sqlalchemy import BigInteger, Column, DateTime, Index, String, Text, UniqueConstraint
+from sqlalchemy.dialects.postgresql import JSONB
+from database.postgres import Base
+
+
+def _now():
+    return datetime.now(timezone.utc)
+
+
+class DeviceAlert(Base):
+    """Current alert state per device+subsystem (upserted, not appended)."""
+    __tablename__ = "device_alerts"
+    __table_args__ = (
+        UniqueConstraint("device_serial", "subsystem"),
+        Index("idx_device_alerts_serial", "device_serial"),
+    )
+
+    id            = Column(BigInteger, primary_key=True, autoincrement=True)
+    device_serial = Column(String(128), nullable=False)
+    subsystem     = Column(String(128), nullable=False)
+    state         = Column(String(64), nullable=False)
+    message       = Column(Text)
+    updated_at    = Column(DateTime(timezone=True), nullable=False, default=_now, onupdate=_now)
+
+
+# NOTE: device_logs, commands, and heartbeats are NOT declared as ORM models here.
+# device_logs is a partitioned table — SQLAlchemy ORM does not support declarative
+# partitioned tables cleanly. All three tables are created via raw SQL in the
+# Alembic migration and accessed via raw queries in database/core.py (SQLite now)
+# and will be accessed via raw async SQL after Phase 5 cutover.