core: make account login upgrades safe while adding multi-account workspace auth (#15487)

Co-authored-by: Kit Langton <kit.langton@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/opencode/migration/20260228203230_blue_harpoon/migration.sql

@@ -0,0 +1,17 @@
+CREATE TABLE `account` (
+	`id` text PRIMARY KEY,
+	`email` text NOT NULL,
+	`url` text NOT NULL,
+	`access_token` text NOT NULL,
+	`refresh_token` text NOT NULL,
+	`token_expiry` integer,
+	`selected_org_id` text,
+	`time_created` integer NOT NULL,
+	`time_updated` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `account_state` (
+	`id` integer PRIMARY KEY NOT NULL,
+	`active_account_id` text,
+	FOREIGN KEY (`active_account_id`) REFERENCES `account`(`id`) ON UPDATE no action ON DELETE set null
+);