Scope device uniqueness per parent, null type/location for sub-components, hide sub-components from list, flat battery summary for parent devices

models.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import Column, Integer, String, Text, ForeignKey, Table
+from sqlalchemy import Column, Integer, String, Text, ForeignKey, Table, UniqueConstraint
 from sqlalchemy.orm import declarative_base, relationship
 
 Base = declarative_base()
@@ -25,7 +25,7 @@ class Device(Base):
     __tablename__ = "device"
 
     id = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(String(100), nullable=False, unique=True)
+    name = Column(String(100), nullable=False)
     battery_slots = Column(Integer, nullable=False, default=1)
     device_type   = Column(String(50),  nullable=True)
     battery_size  = Column(String(20),  nullable=True)   # AA, AAA, 9V, CR2032 …; null for parent-only devices
@@ -33,6 +33,11 @@ class Device(Base):
     notes = Column(Text, nullable=True)
     ha_entity_id = Column(String(100), nullable=True)   # e.g. "sensor.tv_remote_battery"
     parent_id = Column(Integer, ForeignKey("device.id", ondelete="SET NULL"), nullable=True)
+    parent_key = Column(Integer, nullable=False, default=-1)  # -1 for top-level, parent_id for sub-components
+
+    __table_args__ = (
+        UniqueConstraint("parent_key", "name", name="uq_device_parent_key_name"),
+    )
 
     batteries = relationship("Battery", back_populates="device")
     logbook_entries = relationship(
@@ -71,6 +76,16 @@ class Device(Base):
     def is_subcomponent(self):
         return self.parent_id is not None
 
+    def effective_installed_count(self):
+        if self.has_children():
+            return sum(c.installed_count() for c in self.children)
+        return self.installed_count()
+
+    def effective_slots(self):
+        if self.has_children():
+            return sum(c.battery_slots for c in self.children)
+        return self.battery_slots
+
     def __repr__(self):
         return f"<Device {self.name}>"