Initial commit

backend/app/entities/child.py

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+"""Domain entity: Child (per-child entitlement anchor)."""
+
+from dataclasses import dataclass
+from datetime import date, datetime
+from uuid import UUID
+
+
+@dataclass
+class Child:
+    id: UUID
+    workspace_id: UUID
+    name: str
+    birth_date: date  # use expected_birth_date (due date) if unborn
+    preschool_start_date: date | None = None  # drives the preschool-day reserve tip
+    created_at: datetime | None = None