V5.1 Modify Person table: split full name into first & last, added tags support

tests/api/test_v4_documents.py

@@ -37,7 +37,10 @@ def _seed_document_and_person(
     async def _seed() -> tuple[UUID, UUID]:
         async with session_scope(database_url=db_url) as session:
             document = Document(name=document_name)
-            person = Person(full_name=person_name)
+            tokens = [token for token in person_name.split() if token]
+            given_names = " ".join(tokens[:-1]) if len(tokens) >= 2 else person_name
+            last_name = tokens[-1] if len(tokens) >= 2 else person_name
+            person = Person(given_names=given_names, last_name=last_name)
             session.add(document)
             session.add(person)
             await session.commit()