SQL : UNIQUE KEY pour category.name et feed.url

Suite de https://github.com/marienfressinaud/FreshRSS/issues/262

public/install.php

@@ -15,12 +15,12 @@ define ('SQL_REQ_CAT', 'CREATE TABLE IF NOT EXISTS `%scategory` (
   `name` varchar(255) NOT NULL,
   `color` char(7) NOT NULL,
   PRIMARY KEY (`id`),
-  INDEX (`name`)	-- v0.7
+  UNIQUE KEY (`name`)	-- v0.7
 );');
 
 define ('SQL_REQ_FEED', 'CREATE TABLE IF NOT EXISTS `%sfeed` (
   `id` SMALLINT NOT NULL AUTO_INCREMENT,	-- v0.7
-  `url` varchar(511) NOT NULL,
+  `url` varchar(511) CHARACTER SET latin1 NOT NULL,
   `category` SMALLINT DEFAULT 0,	-- v0.7
   `name` varchar(255) NOT NULL,
   `website` varchar(255) NOT NULL,
@@ -35,6 +35,7 @@ define ('SQL_REQ_FEED', 'CREATE TABLE IF NOT EXISTS `%sfeed` (
   `cache_nbUnreads` int NOT NULL DEFAULT 0,	-- v0.7
   PRIMARY KEY (`id`),
   FOREIGN KEY (`category`) REFERENCES %scategory(id) ON DELETE SET NULL ON UPDATE CASCADE,
+  UNIQUE KEY (`url`),	-- v0.7
   INDEX (`name`),	-- v0.7
   INDEX (`priority`),	-- v0.7
   INDEX (`keep_history`)	-- v0.7
@@ -46,7 +47,7 @@ define ('SQL_REQ_ENTRY', 'CREATE TABLE IF NOT EXISTS `%sentry` (
   `title` varchar(255) NOT NULL,
   `author` varchar(255) NOT NULL,
   `content` text NOT NULL,
-  `link` varchar(1023) NOT NULL,
+  `link` varchar(1023) CHARACTER SET latin1 NOT NULL,
   `date` int(11) NOT NULL,
   `is_read` boolean NOT NULL DEFAULT 0,
   `is_favorite` boolean NOT NULL DEFAULT 0,