feat(server): add doc history support (#4970)

packages/backend/server/migrations/20231117062115_history/migration.sql

@@ -0,0 +1,14 @@
+-- AlterTable
+ALTER TABLE "blobs" ADD COLUMN "deleted_at" TIMESTAMPTZ(6);
+
+-- CreateTable
+CREATE TABLE "snapshot_histories" (
+    "workspace_id" VARCHAR(36) NOT NULL,
+    "guid" VARCHAR(36) NOT NULL,
+    "seq" INTEGER NOT NULL,
+    "blob" BYTEA NOT NULL,
+    "state" BYTEA,
+    "created_at" TIMESTAMPTZ(6) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "snapshot_histories_pkey" PRIMARY KEY ("workspace_id","guid","seq")
+);