Added notification manager

sql/00011.sql

@@ -0,0 +1,10 @@
+ CREATE TYPE notification_type AS ENUM('NTFY', 'PUSHOVER', 'HTTP', 'EMAIL');
+
+CREATE TABLE public.notification (
+	id serial4 NOT NULL,
+	service notification_type DEFAULT 'NTFY' NOT NULL,
+	"configuration" jsonb DEFAULT '{}'::jsonb NOT NULL,
+	prio int4 DEFAULT 0 NOT NULL,
+	CONSTRAINT notification_pk PRIMARY KEY (id),
+	CONSTRAINT notification_unique UNIQUE (prio)
+);