Move document search_vector from documents to document_versions

Now that title lives on document_versions, the full-text search vector
belongs there too. Drop the generated column and GIN index from
documents, recreate them on document_versions, and update the document
filter to query the latest version's search_vector.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/coredata/document_filter.go

@@ -131,7 +131,13 @@ func (f *DocumentFilter) SQLFragment() string {
 (
 	CASE
 		WHEN @query::text IS NOT NULL AND @query::text != '' THEN
-			search_vector @@ (
+			(
+				SELECT dv.search_vector
+				FROM document_versions dv
+				WHERE dv.document_id = documents.id
+				ORDER BY dv.major DESC, dv.minor DESC
+				LIMIT 1
+			) @@ (
 				SELECT to_tsquery('simple', string_agg(lexeme || ':*', ' & '))
 				FROM unnest(regexp_split_to_array(trim(@query::text), '\s+')) AS lexeme
 			)

pkg/coredata/migrations/20260407T120000Z.sql

@@ -16,3 +16,14 @@
 ALTER TABLE documents ALTER COLUMN title DROP NOT NULL;
 
 ALTER TABLE documents DROP COLUMN description;
+
+-- Move search_vector from documents to document_versions.
+DROP INDEX documents_search_idx;
+ALTER TABLE documents DROP COLUMN search_vector;
+
+ALTER TABLE document_versions ADD COLUMN search_vector tsvector
+GENERATED ALWAYS AS (
+    to_tsvector('simple', COALESCE(title, ''))
+) STORED;
+
+CREATE INDEX document_versions_search_idx ON document_versions USING gin(search_vector);