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;

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

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+-- Add unique constraint to prevent duplicate versions per document
+-- This ensures that concurrent requests cannot create the same version number
+
+-- First, add documentId column to versions table for easier constraint enforcement
+ALTER TABLE documentFieldExtractionVersions
+ADD COLUMN documentId uuid;
+
+-- Populate documentId from the joined extraction record
+UPDATE documentFieldExtractionVersions dfev
+SET documentId = dfe.documentId
+FROM documentFieldExtractions dfe
+WHERE dfev.fieldExtractionId = dfe.id;
+
+-- Make documentId NOT NULL after populating
+ALTER TABLE documentFieldExtractionVersions
+ALTER COLUMN documentId SET NOT NULL;
+
+-- Add foreign key constraint (documents table has 'id' as primary key)
+ALTER TABLE documentFieldExtractionVersions
+ADD CONSTRAINT fk_documentfieldextractionversions_documentid
+FOREIGN KEY (documentId) REFERENCES documents(id);
+
+-- Add unique constraint on documentId + version
+-- This prevents duplicate version numbers for the same document
+CREATE UNIQUE INDEX idx_unique_version_per_document
+ON documentFieldExtractionVersions(documentId, version);
+
+-- Add index for efficient lookups by documentId
+CREATE INDEX idx_documentfieldextractionversions_documentid
+ON documentFieldExtractionVersions(documentId);