Add project revision foundation

src/db/schema/project-change-sets.ts

@@ -0,0 +1,19 @@
+import { integer, sqliteTable, text, unique } from "drizzle-orm/sqlite-core";
+import { projectRevisions } from "./project-revisions.js";
+
+export const projectChangeSets = sqliteTable(
+  "project_change_sets",
+  {
+    id: text("id").primaryKey(),
+    projectRevisionId: text("project_revision_id")
+      .notNull()
+      .references(() => projectRevisions.id, { onDelete: "cascade" }),
+    commandType: text("command_type").notNull(),
+    payloadSchemaVersion: integer("payload_schema_version").notNull(),
+    forwardPayloadJson: text("forward_payload_json").notNull(),
+    inversePayloadJson: text("inverse_payload_json").notNull(),
+  },
+  (table) => [
+    unique("project_change_sets_revision_unique").on(table.projectRevisionId),
+  ]
+);