refactor(infra): directory structure (#4615)

packages/backend/server/migrations/20231009081826_updates_manager/migration.sql

@@ -0,0 +1,19 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[workspace_id,guid,seq]` on the table `updates` will be added. If there are existing duplicate values, this will fail.
+  - Added the required column `seq` to the `updates` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- DropIndex
+DROP INDEX "updates_guid_workspace_id_idx";
+
+-- AlterTable
+ALTER TABLE "snapshots" ADD COLUMN     "seq" INTEGER NOT NULL DEFAULT 0,
+ADD COLUMN     "state" BYTEA;
+
+-- AlterTable
+ALTER TABLE "updates" ADD COLUMN     "seq" INTEGER NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "updates_workspace_id_guid_seq_key" ON "updates"("workspace_id", "guid", "seq");