Add jobs for creating/deleting Postgres roles

src/Jobs/CreatePostgresRoleForTenant.php

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+<?php
+
+namespace Stancl\Tenancy\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Database\QueryException;
+use Stancl\Tenancy\Database\Contracts\TenantWithDatabase;
+
+class CreatePostgresRoleForTenant implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct(
+        protected TenantWithDatabase&Model $tenant,
+    ) {
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle()
+    {
+        $name = $this->tenant->getTenantKey();
+        $password = $this->tenant->database()->getPassword() ?? 'password';
+
+        try {
+            DB::statement("CREATE ROLE \"$name\" LOGIN PASSWORD '$password';");
+        } catch (QueryException $exception) {
+            // Skip creating Postgres role if it already exists
+        }
+    }
+}

src/Jobs/DeleteTenantsPostgresRole.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Stancl\Tenancy\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Database\QueryException;
+use Stancl\Tenancy\Database\Contracts\TenantWithDatabase;
+
+class DeleteTenantsPostgresRole implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct(
+        protected TenantWithDatabase&Model $tenant,
+    ) {
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle()
+    {
+        $tenantKey = $this->tenant->getTenantKey();
+
+        // Revoke all permissions of a role before dropping it
+        try {
+            DB::statement("DROP OWNED BY \"{$tenantKey}\";");
+            DB::statement("DROP ROLE \"{$tenantKey}\";");
+        } catch (QueryException $exception) {
+            // Skip dropping permissions if the role doesn't exist
+        }
+    }
+}