add session_id -> tx_id migration

migrations/014-session-to-tx-id.js

@@ -0,0 +1,36 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+//    'alter table bills rename device_fingerprint to device_id',
+//    'alter table bills rename satoshis to crypto_atoms',
+//    'alter table bills rename session_id to cash_in_txs_id',
+
+    'alter table cached_responses rename device_fingerprint to device_id',
+    'alter table cached_responses rename session_id to tx_id',
+
+    'alter table cash_in_txs rename session_id to id',
+    'alter table cash_in_txs rename device_fingerprint to device_id',
+
+    'alter table cash_out_actions rename session_id to cash_out_txs_id',
+
+    'alter table cash_out_hds rename session_id to id',
+
+    'alter table cash_out_txs rename session_id to id',
+    'alter table cash_out_txs rename device_fingerprint to device_id',
+
+    'alter table devices rename fingerprint to device_id',
+
+    'alter table dispenses rename session_id to cash_out_txs_id',
+    'alter table dispenses rename device_fingerprint to device_id',
+
+    'alter table machine_configs rename device_fingerprint to device_id',
+
+    'alter table machine_events rename device_fingerprint to device_id'
+  ]
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}