users: rename createdAt to creationTime

migrations/schema.sql

@@ -20,7 +20,7 @@ CREATE TABLE IF NOT EXISTS users(
     email VARCHAR(254) NOT NULL UNIQUE,
     password VARCHAR(1024) NOT NULL,
     salt VARCHAR(512) NOT NULL,
-    createdAt VARCHAR(512) NOT NULL,
+    creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     displayName VARCHAR(512) DEFAULT "",
     fallbackEmail VARCHAR(512) DEFAULT "",
@@ -34,6 +34,7 @@ CREATE TABLE IF NOT EXISTS users(
     avatar MEDIUMBLOB,
     locationJson TEXT, // { locations: [{ ip, userAgent, city, country, ts }] }
 
+    INDEX creationTime_index (creationTime),
     PRIMARY KEY(id));
 
 CREATE TABLE IF NOT EXISTS userGroups(