refactor

backend/migrations/202512010050_drop_correspondent_roles/down.sql

@@ -0,0 +1,7 @@
+ALTER TABLE document_correspondents DROP CONSTRAINT document_correspondents_pkey;
+ALTER TABLE document_correspondents ADD COLUMN role VARCHAR(32) NOT NULL DEFAULT 'other';
+UPDATE document_correspondents SET role = 'other';
+ALTER TABLE document_correspondents ALTER COLUMN role DROP DEFAULT;
+ALTER TABLE document_correspondents
+    ADD CONSTRAINT document_correspondents_pkey
+    PRIMARY KEY (document_id, correspondent_id, role);

backend/migrations/202512010050_drop_correspondent_roles/up.sql

@@ -0,0 +1,24 @@
+WITH ranked AS (
+    SELECT
+        document_id,
+        correspondent_id,
+        role,
+        assigned_at,
+        assigned_by,
+        tenant_id,
+        ROW_NUMBER() OVER (PARTITION BY document_id, correspondent_id ORDER BY assigned_at DESC) AS rn
+    FROM document_correspondents
+)
+DELETE FROM document_correspondents dc
+USING ranked r
+WHERE dc.document_id = r.document_id
+  AND dc.correspondent_id = r.correspondent_id
+  AND dc.role = r.role
+  AND dc.tenant_id = r.tenant_id
+  AND r.rn > 1;
+
+ALTER TABLE document_correspondents DROP CONSTRAINT document_correspondents_pkey;
+ALTER TABLE document_correspondents DROP COLUMN role;
+ALTER TABLE document_correspondents
+    ADD CONSTRAINT document_correspondents_pkey
+    PRIMARY KEY (document_id, correspondent_id);