feat: add dashboard persistence store

drizzle/0000_dashboard_persistence.sql

@@ -0,0 +1,20 @@
+CREATE TABLE `dashboard_documents` (
+	`id` text PRIMARY KEY NOT NULL,
+	`current_revision_id` text,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `dashboard_revisions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`dashboard_id` text NOT NULL,
+	`schema_version` text NOT NULL,
+	`document` text NOT NULL,
+	`actor` text NOT NULL,
+	`message` text,
+	`operation` text NOT NULL,
+	`source_revision_id` text,
+	`created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX `idx_dashboard_revisions_dashboard_created` ON `dashboard_revisions` (`dashboard_id`,`created_at`);