refactor: add table primitive and migrations by date; feat: add mcp connectors

backend/migrations/20260424_01_docx_version_display_name.sql

@@ -0,0 +1,35 @@
+-- Migration date: 2026-04-24
+
+-- Migration: per-version user-editable display name + user_upload source.
+-- Lets users rename individual versions (the assistant-edit default is
+-- "[Edited V{n}]") and differentiate manually-uploaded new versions from
+-- the original upload.
+
+ALTER TABLE public.document_versions
+  ADD COLUMN IF NOT EXISTS display_name text;
+
+-- Broaden source to include 'user_upload' for versions the user uploads
+-- after the original document creation.
+ALTER TABLE public.document_versions
+  DROP CONSTRAINT IF EXISTS document_versions_source_check;
+
+ALTER TABLE public.document_versions
+  ADD CONSTRAINT document_versions_source_check
+  CHECK (source = ANY (ARRAY[
+    'upload'::text,
+    'user_upload'::text,
+    'assistant_edit'::text,
+    'user_accept'::text,
+    'user_reject'::text,
+    'generated'::text
+  ]));
+
+-- Backfill: default display_name to the parent document's filename. New
+-- assistant edits inherit the prior version's display_name (see
+-- runEditDocument), so the version number is no longer baked into the
+-- default label — it's surfaced as a separate tag in the UI.
+UPDATE public.document_versions dv
+SET display_name = d.filename
+FROM public.documents d
+WHERE dv.display_name IS NULL
+  AND d.id = dv.document_id;