Implement server-side push notifications with scheduler and always-remind option

drizzle/0004_sweet_gravity.sql

@@ -0,0 +1,11 @@
+CREATE TABLE `push_subscriptions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`endpoint` text NOT NULL,
+	`p256dh` text NOT NULL,
+	`auth` text NOT NULL,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `push_subscriptions_endpoint_unique` ON `push_subscriptions` (`endpoint`);