Add backend

backend/migrations/0001_init.sql

@@ -0,0 +1,37 @@
+CREATE TABLE IF NOT EXISTS tenants (
+  pubkey TEXT PRIMARY KEY,
+  status TEXT NOT NULL
+);
+
+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,
+  description TEXT NOT NULL,
+  plan TEXT NOT NULL,
+  status TEXT NOT NULL,
+  FOREIGN KEY (tenant) REFERENCES tenants(pubkey)
+);
+
+CREATE TABLE IF NOT EXISTS invoices (
+  id TEXT PRIMARY KEY,
+  tenant TEXT NOT NULL,
+  amount INTEGER NOT NULL,
+  status TEXT NOT NULL,
+  created_at TEXT NOT NULL,
+  invoice TEXT NOT NULL,
+  FOREIGN KEY (tenant) REFERENCES tenants(pubkey)
+);
+
+CREATE TABLE IF NOT EXISTS invoice_items (
+  id TEXT PRIMARY KEY,
+  invoice TEXT NOT NULL,
+  relay TEXT NOT NULL,
+  amount INTEGER NOT NULL,
+  period_start TEXT NOT NULL,
+  period_end TEXT NOT NULL,
+  FOREIGN KEY (invoice) REFERENCES invoices(id),
+  FOREIGN KEY (relay) REFERENCES relays(id)
+);