chg: [plugin:tags] Added migration script

plugins/Tags/config/Migrations/20210831121348_TagSystem.php

@@ -0,0 +1,89 @@
+<?php
+declare(strict_types=1);
+
+use Migrations\AbstractMigration;
+
+
+class TagSystem extends AbstractMigration
+{
+    public function change() {
+        $tags = $this->table('tags_tags')
+            ->addColumn('namespace', 'string', [
+                'default' => null,
+                'limit' => 255,
+                'null' => true,
+            ])
+            ->addColumn('predicate', 'string', [
+                'default' => null,
+                'limit' => 255,
+                'null' => true,
+            ])
+            ->addColumn('value', 'string', [
+                'default' => null,
+                'limit' => 255,
+                'null' => true,
+            ])
+            ->addColumn('name', 'string', [
+                'default' => null,
+                'limit' => 255,
+                'null' => false,
+            ])
+            ->addColumn('colour', 'string', [
+                'default' => null,
+                'limit' => 7,
+                'null' => false,
+            ])
+            ->addColumn('counter', 'integer', [
+                'default' => 0,
+                'length' => 11,
+                'null' => false,
+                'signed' => false,
+                'comment' => 'Field used by the CounterCache behaviour to count the occurence of tags'
+            ])
+            ->addColumn('created', 'datetime', [
+                'default' => null,
+                'null' => false,
+            ])
+            ->addColumn('modified', 'datetime', [
+                'default' => null,
+                'null' => false,
+            ])
+            ->create();
+
+        $tagged = $this->table('tags_tagged')
+            ->addColumn('tag_id', 'integer', [
+                'default' => null,
+                'null' => false,
+                'signed' => false,
+                'length' => 10,
+            ])
+            ->addColumn('fk_id', 'integer', [
+                'default' => null,
+                'null' => true,
+                'signed' => false,
+                'length' => 10,
+                'comment' => 'The ID of the entity being tagged'
+            ])
+            ->addColumn('fk_model', 'string', [
+                'default' => null,
+                'limit' => 255,
+                'null' => false,
+                'comment' => 'The model name of the entity being tagged'
+            ])
+            ->addColumn('created', 'datetime', [
+                'default' => null,
+                'null' => false,
+            ])
+            ->addColumn('modified', 'datetime', [
+                'default' => null,
+                'null' => false,
+            ])
+            ->create();
+
+        $tags->addIndex(['name'], ['unique' => true])
+            ->update();
+
+        $tagged->addIndex(['tag_id', 'fk_id', 'fk_table'], ['unique' => true])
+            ->update();
+    }
+}