feat: individual discounts migration

feat: loyalty panel routing
chore: rename promo-codes module to loyalty

migrations/1626891847835-add-individual-discounts.js

@@ -0,0 +1,21 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    `CREATE TYPE individual_discount_identification_type AS ENUM('phone', 'id_number')`,
+    `CREATE TABLE individual_discounts (
+      id UUID PRIMARY KEY,
+      identification individual_discount_identification_type NOT NULL,
+      value TEXT NOT NULL,
+      discount SMALLINT NOT NULL,
+      soft_deleted BOOLEAN DEFAULT false
+    )`,
+    `CREATE UNIQUE INDEX uq_individual_discount ON individual_discounts (value) WHERE NOT soft_deleted`
+  ]
+
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}