[Web] Time limited aliases: show create date; create aliases with 1yr retention by default; create temp alias in alias domain; better random names; accept any validity time

[Web] Replace spam score slider by nouislider and rework table a bit

data/web/inc/init_db.inc.php

@@ -3,7 +3,7 @@ function init_db_schema() {
   try {
     global $pdo;
 
-    $db_version = "09032021_1000";
+    $db_version = "21052021_0900";
 
     $stmt = $pdo->query("SHOW TABLES LIKE 'versions'");
     $num_results = count($stmt->fetchAll(PDO::FETCH_ASSOC));
@@ -445,7 +445,9 @@ function init_db_schema() {
         "cols" => array(
           "address" => "VARCHAR(255) NOT NULL",
           "goto" => "TEXT NOT NULL",
-          "validity" => "INT(11) NOT NULL"
+          "created" => "DATETIME(0) NOT NULL DEFAULT NOW(0)",
+          "modified" => "DATETIME ON UPDATE CURRENT_TIMESTAMP",
+          "validity" => "INT(11)"
         ),
         "keys" => array(
           "primary" => array(