Merged in feature/textExtractionsPart2 (pull request #193)

Continue finishing the parts of the text extraction plan

* add missing fields

internal/database/migrations/00000000000117_add_version_unique_constraint.down.sql

@@ -0,0 +1,10 @@
+-- Remove the unique constraint and documentId column
+
+DROP INDEX IF EXISTS idx_documentfieldextractionversions_documentid;
+DROP INDEX IF EXISTS idx_unique_version_per_document;
+
+ALTER TABLE documentFieldExtractionVersions
+DROP CONSTRAINT IF EXISTS fk_documentfieldextractionversions_documentid;
+
+ALTER TABLE documentFieldExtractionVersions
+DROP COLUMN IF EXISTS documentId;