Peer enhancements: notes, traffic quotas with auto-disable, batch create, usage tracking; relay subnets for bridging into other tunnels

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

app/models.py

@@ -22,6 +22,20 @@ class Peer(Base):
     enabled: Mapped[bool] = mapped_column(Boolean, default=True)
     expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)
+    note: Mapped[str] = mapped_column(String(256), default="")
+    quota_bytes: Mapped[int] = mapped_column(Integer, default=0)
+    cum_rx: Mapped[int] = mapped_column(Integer, default=0)
+    cum_tx: Mapped[int] = mapped_column(Integer, default=0)
+    last_rx: Mapped[int] = mapped_column(Integer, default=0)
+    last_tx: Mapped[int] = mapped_column(Integer, default=0)
+
+    @property
+    def cum_total(self) -> int:
+        return self.cum_rx + self.cum_tx
+
+    @property
+    def over_quota(self) -> bool:
+        return self.quota_bytes > 0 and self.cum_total >= self.quota_bytes
 
 
 class TrafficSample(Base):