Feat: save highVolumeTxs on DB and plugins code refactor

Fix: remove unused module and add space before '('

Chore: add jest tests for transactionNotify

lib/notifier/queries.js

@@ -1,3 +1,12 @@
 const dbm = require('../postgresql_interface')
+const db = require('../db')
+const { v4: uuidv4 } = require('uuid')
 
-module.exports = { machineEvents: dbm.machineEvents }
+const addHighValueTx = (tx) => {
+    const sql = `INSERT INTO notifications (id, type, device_id, message, created) values($1, $2, $3, $4, CURRENT_TIMESTAMP)`
+    const direction = tx.direction === "cashOut" ? 'cash-out' : 'cash-in'
+    const message = `${tx.fiat} ${tx.fiatCode} ${direction} transaction`
+    return db.oneOrNone(sql, [uuidv4(), 'highValueTransaction', tx.deviceId, message])
+}
+
+module.exports = { machineEvents: dbm.machineEvents, addHighValueTx }