Add persistent history stacks

src/db/migrations/0013_project_history_stacks.sql

@@ -0,0 +1,11 @@
+CREATE TABLE `project_history_stack_entries` (
+	`change_set_id` text PRIMARY KEY NOT NULL,
+	`project_id` text NOT NULL,
+	`stack` text NOT NULL,
+	`position` integer NOT NULL,
+	FOREIGN KEY (`change_set_id`) REFERENCES `project_change_sets`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON UPDATE no action ON DELETE cascade,
+	CONSTRAINT "project_history_stack_entries_stack_check" CHECK("project_history_stack_entries"."stack" in ('undo', 'redo'))
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `project_history_stack_entries_position_unique` ON `project_history_stack_entries` (`project_id`,`stack`,`position`);

src/db/migrations/meta/_journal.json

@@ -92,6 +92,13 @@
       "when": 1784833957929,
       "tag": "0012_project_revision_foundation",
       "breakpoints": true
+    },
+    {
+      "idx": 13,
+      "version": "6",
+      "when": 1784835703230,
+      "tag": "0013_project_history_stacks",
+      "breakpoints": true
     }
   ]
 }