fix: remove -g option in migrate:rollback

Rollback specifies a batch number and returns the database to that state.
It is not possible to specify a specific group to return to a state.

system/Commands/Database/MigrateRollback.php

@@ -58,7 +58,6 @@ class MigrateRollback extends BaseCommand
      */
     protected $options = [
         '-b' => 'Specify a batch to roll back to; e.g. "3" to return to batch #3',
-        '-g' => 'Set database group',
         '-f' => 'Force command - this option allows you to bypass the confirmation question when running this command in a production environment',
     ];
 
@@ -79,11 +78,6 @@ public function run(array $params)
         }
 
         $runner = Services::migrations();
-        $group  = $params['g'] ?? CLI::getOption('g');
-
-        if (is_string($group)) {
-            $runner->setGroup($group);
-        }
 
         try {
             $batch = $params['b'] ?? CLI::getOption('b') ?? $runner->getLastBatch() - 1;

system/Database/MigrationRunner.php

@@ -220,9 +220,10 @@ public function latest(?string $group = null)
      *
      * Calls each migration step required to get to the provided batch
      *
-     * @param int $targetBatch Target batch number, or negative for a relative batch, 0 for all
+     * @param int         $targetBatch Target batch number, or negative for a relative batch, 0 for all
+     * @param string|null $group       Deprecated. The designation has no effect.
      *
-     * @return mixed Current batch number on success, FALSE on failure or no migrations are found
+     * @return bool True on success, FALSE on failure or no migrations are found
      *
      * @throws ConfigException
      * @throws RuntimeException
@@ -233,11 +234,6 @@ public function regress(int $targetBatch = 0, ?string $group = null)
             throw ConfigException::forDisabledMigrations();
         }
 
-        // Set database group if not null
-        if ($group !== null) {
-            $this->setGroup($group);
-        }
-
         $this->ensureTable();
 
         $batches = $this->getBatches();

user_guide_src/source/dbmgmt/migration.rst

@@ -144,15 +144,14 @@ to minimize any potential conflicts between the main application and any modules
 rollback
 ========
 
-Rolls back all migrations, taking the database group to a blank slate, effectively migration 0:
+Rolls back all migrations to a blank slate, effectively migration 0:
 
 .. code-block:: console
 
   php spark migrate:rollback
 
 You can use (rollback) with the following options:
 
-- ``-g`` - to choose database group, otherwise default database group will be used.
 - ``-b`` - to choose a batch: natural numbers specify the batch.
 - ``-f`` - to force a bypass confirmation question, it is only asked in a production environment.