fix: multiple fixes related with recyclers/stackers

feat: add bill destination unit for cash-in txs
feat: l-m communication regarding cash unit state

lib/postgresql_interface.js

@@ -40,6 +40,21 @@ exports.cassetteCounts = function cassetteCounts (deviceId) {
     })
 }
 
+exports.stackerCounts = function stackerCounts (deviceId) {
+  const sql = 'SELECT stacker1f, stacker1r, stacker2f, stacker2r, stacker3f, stacker3r, number_of_stackers FROM devices ' +
+    'WHERE device_id=$1'
+
+  return db.one(sql, [deviceId])
+    .then(row => {
+      const counts = []
+      _.forEach(it => {
+        counts.push(row[`stacker${it + 1}f`], row[`stacker${it + 1}r`])
+      }, _.times(_.identity(), row.number_of_stackers))
+
+      return { numberOfStackers: row.number_of_stackers, counts }
+    })
+}
+
 // Note: since we only prune on insert, we'll always have
 // last known state.
 exports.machineEvent = function machineEvent (rec) {