feat: automatic worktree suspension (#1231)

Author: jonathanlab

apps/code/src/main/db/migrations/0002_massive_bishop.sql

@@ -0,0 +1,13 @@
+CREATE TABLE `suspensions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`workspace_id` text NOT NULL,
+	`branch_name` text,
+	`checkpoint_id` text,
+	`suspended_at` text NOT NULL,
+	`reason` text NOT NULL,
+	`created_at` text DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
+	`updated_at` text DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
+	FOREIGN KEY (`workspace_id`) REFERENCES `workspaces`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `suspensions_workspaceId_unique` ON `suspensions` (`workspace_id`);