Add migration to fix allocations server_id foreign key (#542)

* add migration to fix allocations server_id foreign key

* fix the fix...

database/migrations/2024_08_13_171337_fix_allocation_server_foreign_key.php

@@ -0,0 +1,54 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        // Only needed for sqlite
+        if (Schema::getConnection()->getDriverName() !== 'sqlite') {
+            return;
+        }
+
+        // Disable foreign checks
+        // legacy_alter_table needs to be 'ON' so existing foreign key table references aren't renamed when renaming the table, see https://www.sqlite.org/lang_altertable.html
+        DB::statement('PRAGMA foreign_keys = OFF');
+        DB::statement('PRAGMA legacy_alter_table = ON');
+
+        DB::transaction(function () {
+            DB::statement('ALTER TABLE allocations RENAME TO _allocations_old');
+            DB::statement('CREATE TABLE allocations
+                ("id" integer primary key autoincrement not null,
+                "node_id" integer not null,
+                "ip" varchar not null,
+                "port" integer not null,
+                "server_id" integer,
+                "created_at" datetime,
+                "updated_at" datetime,
+                "ip_alias" text,
+                "notes" varchar,
+                foreign key("node_id") references "nodes"("id") on delete cascade,
+                foreign key("server_id") references "servers"("id") on delete set null)');
+            DB::statement('INSERT INTO allocations SELECT * FROM _allocations_old');
+            DB::statement('DROP TABLE _allocations_old');
+            DB::statement('CREATE UNIQUE INDEX "allocations_node_id_ip_port_unique" on "allocations" ("node_id", "ip", "port")');
+        });
+
+        DB::statement('PRAGMA foreign_keys = ON');
+        DB::statement('PRAGMA legacy_alter_table = OFF');
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Reverse not needed
+    }
+};