Tables and indexing

ensure() creates an empty table containing Anvia's reserved row ID, document ID, document, metadata, and vector columns when missing, then validates it. validate() requires the named table to exist and checks its schema.

The adapter replaces rows for re-ingested document IDs — deleting matches before table.add() — and does not create a LanceDB scalar or vector index. For a growing production corpus:

1. Provision or open the durable table outside request handling.
2. Create and tune indexes through LanceDB administration.
3. Delete rows for document IDs that leave the corpus; re-upserted IDs are replaced automatically.
4. Run compaction or optimization according to your LanceDB deployment.

dimensions is required and validated: the constructor rejects non-positive values, and validate() throws when the __anvia_vector column's list size differs from the configured dimensions.