diff --git a/framework/core/migrations/2015_02_24_000000_create_access_tokens_table.php b/framework/core/migrations/2015_02_24_000000_create_access_tokens_table.php
index 9d123d0f2..dd904a93b 100644
--- a/framework/core/migrations/2015_02_24_000000_create_access_tokens_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_access_tokens_table.php
@@ -14,7 +14,7 @@ class CreateAccessTokensTable extends Migration {
 	{
 		Schema::create('access_tokens', function(Blueprint $table)
 		{
-			$table->string('id');
+			$table->string('id', 100);
 			$table->integer('user_id')->unsigned();
 		});
 	}
diff --git a/framework/core/migrations/2015_02_24_000000_create_activity_table.php b/framework/core/migrations/2015_02_24_000000_create_activity_table.php
index 401847afa..a1b22d29b 100644
--- a/framework/core/migrations/2015_02_24_000000_create_activity_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_activity_table.php
@@ -17,7 +17,7 @@ class CreateActivityTable extends Migration {
 			$table->increments('id');
 			$table->integer('user_id')->unsigned();
 			$table->integer('sender_id')->unsigned()->nullable();
-			$table->string('type');
+			$table->string('type', 100);
 			$table->binary('data')->nullable();
 			$table->dateTime('time');
 		});
diff --git a/framework/core/migrations/2015_02_24_000000_create_config_table.php b/framework/core/migrations/2015_02_24_000000_create_config_table.php
index b74c9f1c4..e3e7c3368 100644
--- a/framework/core/migrations/2015_02_24_000000_create_config_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_config_table.php
@@ -14,7 +14,7 @@ class CreateConfigTable extends Migration {
 	{
 		Schema::create('config', function(Blueprint $table)
 		{
-			$table->string('key')->primary();
+			$table->string('key', 100)->primary();
 			$table->binary('value')->nullable();
 		});
 	}
diff --git a/framework/core/migrations/2015_02_24_000000_create_discussions_table.php b/framework/core/migrations/2015_02_24_000000_create_discussions_table.php
index 791ab1aa1..97f8a5551 100644
--- a/framework/core/migrations/2015_02_24_000000_create_discussions_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_discussions_table.php
@@ -15,7 +15,7 @@ class CreateDiscussionsTable extends Migration {
 		Schema::create('discussions', function(Blueprint $table)
 		{
 			$table->increments('id');
-			$table->string('title');
+			$table->string('title', 200);
 			$table->integer('comments_count')->unsigned()->default(0);
 			$table->integer('number_index')->unsigned()->default(0);
 
diff --git a/framework/core/migrations/2015_02_24_000000_create_groups_table.php b/framework/core/migrations/2015_02_24_000000_create_groups_table.php
index 44ec0710d..f787ac2de 100644
--- a/framework/core/migrations/2015_02_24_000000_create_groups_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_groups_table.php
@@ -14,10 +14,10 @@ class CreateGroupsTable extends Migration
     {
         Schema::create('groups', function (Blueprint $table) {
             $table->increments('id');
-            $table->string('name_singular');
-            $table->string('name_plural');
-            $table->string('color')->nullable();
-            $table->string('icon')->nullable();
+            $table->string('name_singular', 100);
+            $table->string('name_plural', 100);
+            $table->string('color', 20)->nullable();
+            $table->string('icon', 100)->nullable();
         });
     }
 
diff --git a/framework/core/migrations/2015_02_24_000000_create_notifications_table.php b/framework/core/migrations/2015_02_24_000000_create_notifications_table.php
index f2684931e..8d158e49a 100644
--- a/framework/core/migrations/2015_02_24_000000_create_notifications_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_notifications_table.php
@@ -17,8 +17,8 @@ class CreateNotificationsTable extends Migration {
 			$table->increments('id');
 			$table->integer('user_id')->unsigned();
 			$table->integer('sender_id')->unsigned()->nullable();
-            $table->string('type');
-            $table->string('subject_type')->nullable();
+            $table->string('type', 100);
+            $table->string('subject_type', 200)->nullable();
 			$table->integer('subject_id')->unsigned()->nullable();
 			$table->binary('data')->nullable();
 			$table->dateTime('time');
diff --git a/framework/core/migrations/2015_02_24_000000_create_posts_table.php b/framework/core/migrations/2015_02_24_000000_create_posts_table.php
index 5457836a9..8ccfe3e3d 100644
--- a/framework/core/migrations/2015_02_24_000000_create_posts_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_posts_table.php
@@ -20,7 +20,7 @@ class CreatePostsTable extends Migration {
 
 			$table->dateTime('time');
 			$table->integer('user_id')->unsigned()->nullable();
-			$table->string('type')->nullable();
+			$table->string('type', 100)->nullable();
 			$table->text('content')->nullable();
 			$table->text('content_html')->nullable();
 
diff --git a/framework/core/migrations/2015_02_24_000000_create_users_table.php b/framework/core/migrations/2015_02_24_000000_create_users_table.php
index 4c0a5989a..7908afb19 100644
--- a/framework/core/migrations/2015_02_24_000000_create_users_table.php
+++ b/framework/core/migrations/2015_02_24_000000_create_users_table.php
@@ -15,15 +15,15 @@ class CreateUsersTable extends Migration {
         Schema::create('users', function(Blueprint $table)
         {
             $table->increments('id');
-            $table->string('username')->unique();
-            $table->string('email')->unique();
+            $table->string('username', 100)->unique();
+            $table->string('email', 150)->unique();
             $table->boolean('is_confirmed')->default(0);
-            $table->string('confirmation_token')->nullable();
+            $table->string('confirmation_token', 50)->nullable();
             $table->boolean('is_activated')->default(0);
-            $table->string('password');
+            $table->string('password', 100);
             $table->text('bio')->nullable();
             $table->text('bio_html')->nullable();
-            $table->string('avatar_path')->nullable();
+            $table->string('avatar_path', 100)->nullable();
             $table->binary('preferences')->nullable();
             $table->dateTime('join_time')->nullable();
             $table->dateTime('last_seen_time')->nullable();