Stabilize id/schema

backend/migrations/0001_init.sql

@@ -1,17 +1,19 @@
 CREATE TABLE IF NOT EXISTS tenants (
   pubkey TEXT PRIMARY KEY,
-  status TEXT NOT NULL
+  status TEXT NOT NULL,
+  tenant_nwc_url TEXT NOT NULL DEFAULT ""
 );
 
 CREATE TABLE IF NOT EXISTS relays (
   id TEXT PRIMARY KEY,
   tenant TEXT NOT NULL,
   name TEXT NOT NULL,
-  subdomain TEXT NOT NULL,
-  schema TEXT NOT NULL,
+  subdomain TEXT NOT NULL UNIQUE,
   description TEXT NOT NULL,
   plan TEXT NOT NULL,
   status TEXT NOT NULL,
+  icon TEXT NOT NULL DEFAULT "",
+  config TEXT,
   FOREIGN KEY (tenant) REFERENCES tenants(pubkey)
 );