phase 14-15: docker build validation and helm deployment

infra/migrations/004_dedupe_indexes.sql

@@ -0,0 +1,13 @@
+-- Stonks Oracle - Dedupe support indexes
+
+-- Index on canonical_url for cross-source deduplication lookups.
+-- The dedupe module queries documents by canonical_url to detect
+-- the same article ingested from different source types.
+CREATE INDEX idx_documents_canonical_url ON documents(canonical_url)
+    WHERE canonical_url IS NOT NULL;
+
+-- Unique constraint on document_company_mentions to prevent duplicate
+-- company links when cross-source dedupe links an existing document
+-- to an additional company.
+CREATE UNIQUE INDEX idx_doc_mentions_unique
+    ON document_company_mentions(document_id, company_id);