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.

backend/devices/router.py

@@ -451,11 +451,17 @@ async def remove_user_from_device(
     data = device_doc.to_dict() or {}
     user_list = data.get("user_list", []) or []
 
-    # Remove any entry that resolves to this user_id
-    new_list = [
-        entry for entry in user_list
-        if not (isinstance(entry, str) and entry.split("/")[-1] == user_id)
-    ]
+    from google.cloud.firestore_v1 import DocumentReference as DocRef
+
+    def resolves_to(entry, uid: str) -> bool:
+        if isinstance(entry, DocRef):
+            return entry.id == uid
+        if isinstance(entry, str):
+            return entry.split("/")[-1] == uid
+        return False
+
+    # Remove any entry that resolves to this user_id (handles both DocRef and string paths)
+    new_list = [entry for entry in user_list if not resolves_to(entry, user_id)]
     device_ref.update({"user_list": new_list})
 
     return {"status": "removed", "user_id": user_id}