Initial commit

backend/migrations/202503120003_use_version_uuid/up.sql

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+ALTER TABLE documents ADD COLUMN current_version_id UUID;
+
+UPDATE documents AS d
+SET current_version_id = dv.id
+FROM document_versions AS dv
+WHERE dv.document_id = d.id
+  AND dv.version_number = d.current_version;
+
+ALTER TABLE documents
+    ALTER COLUMN current_version_id SET NOT NULL;
+
+ALTER TABLE documents
+    ADD CONSTRAINT documents_current_version_fk
+        FOREIGN KEY (current_version_id)
+        REFERENCES document_versions(id)
+        DEFERRABLE INITIALLY DEFERRED;
+
+CREATE INDEX idx_documents_current_version_id
+    ON documents(current_version_id);
+
+ALTER TABLE documents DROP COLUMN current_version;