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

backend/migrations/20260421_01_docx_editing.sql

@@ -0,0 +1,52 @@
+-- Migration date: 2026-04-21
+
+-- Migration: DOCX editing with tracked changes.
+-- Adds per-edit Accept/Reject state and a pointer to the document's current version.
+-- Assumes document_versions table already exists (see separate migration).
+
+-- 1. Broaden document_versions.source to include 'user_reject'.
+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,
+    'assistant_edit'::text,
+    'user_accept'::text,
+    'user_reject'::text,
+    'generated'::text
+  ]));
+
+-- 2. Point each document at its currently active version (null = original upload).
+ALTER TABLE public.documents
+  ADD COLUMN IF NOT EXISTS current_version_id uuid
+  REFERENCES public.document_versions(id) ON DELETE SET NULL;
+
+-- 3. Per-edit registry. One row per tracked change proposed by the assistant.
+--    change_id is the w:id written into document.xml so Accept/Reject can
+--    locate the specific w:ins/w:del pair on the latest version.
+CREATE TABLE IF NOT EXISTS public.document_edits (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  document_id uuid NOT NULL REFERENCES public.documents(id) ON DELETE CASCADE,
+  chat_message_id uuid REFERENCES public.chat_messages(id) ON DELETE SET NULL,
+  version_id uuid NOT NULL REFERENCES public.document_versions(id) ON DELETE CASCADE,
+  change_id text NOT NULL,
+  deleted_text text NOT NULL DEFAULT '',
+  inserted_text text NOT NULL DEFAULT '',
+  context_before text,
+  context_after text,
+  status text NOT NULL DEFAULT 'pending'
+    CHECK (status = ANY (ARRAY['pending'::text, 'accepted'::text, 'rejected'::text])),
+  created_at timestamptz NOT NULL DEFAULT now(),
+  resolved_at timestamptz
+);
+
+CREATE INDEX IF NOT EXISTS document_edits_document_id_idx
+  ON public.document_edits (document_id, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS document_edits_message_id_idx
+  ON public.document_edits (chat_message_id);
+
+CREATE INDEX IF NOT EXISTS document_edits_version_id_idx
+  ON public.document_edits (version_id);