refactor(infra): directory structure (#4615)

packages/backend/server/migrations/20230714065216_snapshot_id/migration.sql

@@ -0,0 +1,12 @@
+/*
+  Warnings:
+
+  - The primary key for the `snapshots` table will be changed. If it partially fails, the table could be left without primary key constraint.
+
+*/
+-- DropIndex
+DROP INDEX "snapshots_workspace_id_idx";
+
+-- AlterTable
+ALTER TABLE "snapshots" DROP CONSTRAINT "snapshots_pkey",
+ADD CONSTRAINT "snapshots_pkey" PRIMARY KEY ("guid", "workspace_id");