Added primary-colum to page_tag, formatted sql queries

tables.sql

@@ -45,10 +45,11 @@ CREATE TABLE tag (
 CREATE TABLE page_tag (
   `page_id` CHAR(16) NOT NULL,
   `tag_id`  CHAR(16) NOT NULL,
+  `primary` BOOLEAN NOT NULL,
 
   PRIMARY KEY (`page_id`, `tag_id`),
   FOREIGN KEY (`page_id`) REFERENCES page(`id`) ON DELETE CASCADE,
-  FOREIGN KEY (`tag_id`)  REFERENCES tag(`id`) ON DELETE CASCADE
+  FOREIGN KEY (`tag_id`) REFERENCES tag(`id`) ON DELETE CASCADE
 );
 
 CREATE TABLE page_unread (
@@ -57,5 +58,5 @@ CREATE TABLE page_unread (
 
   PRIMARY KEY (`page_id`, `user_id`),
   FOREIGN KEY (`page_id`) REFERENCES page(`id`) ON DELETE CASCADE,
-  FOREIGN KEY (`user_id`)  REFERENCES user(`id`) ON DELETE CASCADE
+  FOREIGN KEY (`user_id`) REFERENCES user(`id`) ON DELETE CASCADE
 );