diff --git a/amanuensis/backend/index.py b/amanuensis/backend/index.py
new file mode 100644
index 0000000..bdd8ac5
--- /dev/null
+++ b/amanuensis/backend/index.py
@@ -0,0 +1,30 @@
+"""
+Membership query interface
+"""
+
+from amanuensis.db import DbContext, ArticleIndex, IndexType
+from amanuensis.errors import ArgumentError
+
+
+def create(
+    db: DbContext,
+    lexicon_id: int,
+    index_type: IndexType,
+    pattern: str,
+    logical_order: int,
+    display_order: int,
+    capacity: int) -> ArticleIndex:
+    """
+    """
+
+    new_index = ArticleIndex(
+        lexicon_id=lexicon_id,
+        index_type=index_type,
+        pattern=pattern,
+        logical_order=logical_order,
+        display_order=display_order,
+        capacity=capacity,
+    )
+    db.session.add(new_index)
+    db.session.commit()
+    return new_index
diff --git a/tests/test_index.py b/tests/test_index.py
new file mode 100644
index 0000000..e69de29