feat: add index for snapshots (#8163)

packages/backend/server/migrations/20240908130725_add_workspace_level_snapshot_index/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.
+
+*/
+-- AlterTable
+ALTER TABLE "snapshots" DROP CONSTRAINT "snapshots_pkey",
+ADD CONSTRAINT "snapshots_pkey" PRIMARY KEY ("workspace_id", "guid");
+
+-- CreateIndex
+CREATE INDEX "snapshots_workspace_id_updated_at_idx" ON "snapshots"("workspace_id", "updated_at");