micropub_endpoint, micropub_token and ping_urls are nullable.

compass/database/migrations/2015_12_28_221004_micropub.php

@@ -13,8 +13,8 @@ class Micropub extends Migration
     public function up()
     {
       Schema::table('databases', function ($table) {
-        $table->string('micropub_endpoint', 255);
-        $table->string('micropub_token', 1024);
+        $table->string('micropub_endpoint', 255)->nullable();
+        $table->string('micropub_token', 1024)->nullable();
       });
     }
 

compass/database/migrations/2017_05_21_093158_add_ping_urls.php

@@ -13,7 +13,7 @@ class AddPingUrls extends Migration
     public function up()
     {
       Schema::table('databases', function ($table) {
-        $table->string('ping_urls', 1024);
+        $table->string('ping_urls', 1024)->nullable();
       });
     }
 

compass/database/schema.sql

@@ -12,9 +12,9 @@ CREATE TABLE `databases` (
   `write_token` varchar(255) DEFAULT NULL,
   `created_by` int(11) DEFAULT NULL,
   `created_at` datetime DEFAULT NULL,
-  `micropub_endpoint` varchar(255) NOT NULL,
-  `micropub_token` varchar(1024) NOT NULL,
-  `ping_urls` varchar(1024) NOT NULL,
+  `micropub_endpoint` varchar(255) DEFAULT NULL,
+  `micropub_token` varchar(1024) DEFAULT NULL,
+  `ping_urls` varchar(1024) DEFAULT NULL,
   `timezone` varchar(100) NOT NULL DEFAULT 'UTC',
   `metric` boolean NOT NULL DEFAULT 1,
   PRIMARY KEY (`id`),