feat: switch to postgres only sync, removed nats publishing

migrations/002_ussd_data.sql

@@ -0,0 +1,14 @@
+CREATE TABLE IF NOT EXISTS ussd_data(
+    id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    phone_number TEXT UNIQUE,
+    blockchain_address TEXT UNIQUE,
+    first_name TEXT,
+    last_name TEXT,
+    yob INT,
+    location_name TEXT,
+    gender TEXT,
+    commodities TEXT,
+    active_voucher TEXT,
+    lang_code TEXT
+);
+