feat: add `ON_CREATE_LINK`, `ON_DELETE_LINK` fields to support new rule engine triggers in Document Warehouse API v1
feat: deprecate DB_CLOUD_SQL_POSTGRES in Document Warehouse API v1
PiperOrigin-RevId: 555672042
Document Warehouse (DW) is an AI-integrated cloud-native GCP platform to store, search, organize, govern and analyze documents and their structured metadata (called Properties). Documents include structured (e.g. forms, invoices) and unstructured (e.g. contracts, research papers) and their Properties (metadata) includes AI-extracted data from documents and manually or AI-assigned tags (e.g. account number, loan ID, document type). It's a service provided to cloud enterprise customers.
PiperOrigin-RevId: 474419314