User repository (#3795)

* It builds with the new user repository

* fix(test): fix broken test

* fix(api): fix registration endpoint that was broken after the change

* fix(test): update test to reflect new user repository

* fix: use interface type instead of concrete type

* fix: restore commented out code

utils/db.go

@@ -0,0 +1,20 @@
+package utils
+
+import (
+	"database/sql"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// MustExec will execute a SQL statement on a provided database instance.
+func MustExec(s string, db *sql.DB) {
+	stmt, err := db.Prepare(s)
+	if err != nil {
+		log.Panic(err)
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec()
+	if err != nil {
+		log.Warnln(err)
+	}
+}