implemented postgres support in repositories

src/baby_monitor/utils/verify_child_access.py

@@ -0,0 +1,28 @@
+"""Definition of verify_child_access function."""
+
+from fastapi import HTTPException
+from baby_monitor.repositories.interfaces import (
+    ChildRepositoryInterface,
+)
+
+
+def verify_child_access(
+    child_repo: ChildRepositoryInterface, child_id: int, user_id: int
+) -> None:
+    """Verify that user has access to the child.
+
+    Args:
+        child_repo: Child repository instance
+        child_id: ID of the child to verify access for
+        user_id: ID of the user requesting access
+
+    Raises:
+        HTTPException: 404 if child not found, 403 if user is not a parent
+    """
+    child = child_repo.get_by_id(child_id)
+    if not child:
+        raise HTTPException(status_code=404, detail="Child not found")
+
+    parent_ids = child_repo.get_parent_ids(child_id)
+    if user_id not in parent_ids:
+        raise HTTPException(status_code=403, detail="Access denied to this child")