Add persistent history stacks

src/db/schema/project-history-stack-entries.ts

@@ -0,0 +1,35 @@
+import { sql } from "drizzle-orm";
+import {
+  check,
+  integer,
+  sqliteTable,
+  text,
+  unique,
+} from "drizzle-orm/sqlite-core";
+import { projectChangeSets } from "./project-change-sets.js";
+import { projects } from "./projects.js";
+
+export const projectHistoryStackEntries = sqliteTable(
+  "project_history_stack_entries",
+  {
+    changeSetId: text("change_set_id")
+      .primaryKey()
+      .references(() => projectChangeSets.id, { onDelete: "cascade" }),
+    projectId: text("project_id")
+      .notNull()
+      .references(() => projects.id, { onDelete: "cascade" }),
+    stack: text("stack").notNull(),
+    position: integer("position").notNull(),
+  },
+  (table) => [
+    check(
+      "project_history_stack_entries_stack_check",
+      sql`${table.stack} in ('undo', 'redo')`
+    ),
+    unique("project_history_stack_entries_position_unique").on(
+      table.projectId,
+      table.stack,
+      table.position
+    ),
+  ]
+);