When writing to a database/graph store, make the storage adapter the source of truth for schema details and persist data idempotently.

Apply these rules:

• Don’t set storage-specific element metadata (e.g., vertex_type, edge_type) in business logic. Provide only domain fields; let the adapter derive types from its schema/config.
• Persist through adapter methods (not ad-hoc insert logic). Prefer upsert* APIs for vertices/edges/chunks/relations so repeated loads don’t create duplicates.
• Keep DB-wide configuration (charset/collation) at the database level, not per-table.

Example (graph store):

# Bad: callers forcing storage element typing
# graph.upsert_vertex(Vertex(name, description=summary, vertex_type='entity'))

# Good: callers provide only domain data; adapter assigns types
graph.upsert_vertex(Vertex(name, description=summary))

# And when building relations from chunks/documents, route through adapter upsert helpers
graph_adapter.upsert_document_include_chunk(chunk=chunk, doc_vid=doc_vid)
graph_adapter.upsert_chunk_next_chunk(prev_chunk=prev, next_chunk=chunk)

Example (DB config principle):

• Set charset/collation when creating/configuring the database, rather than configuring it separately for each table.