Use user_id for unique key in messages table (closes #1484074)

SQL/mysql.initial.sql

@@ -122,7 +122,7 @@ CREATE TABLE `messages` (
   KEY `user_id` (`user_id`),
   KEY `idx` (`idx`),
   KEY `uid` (`uid`),
-  UNIQUE `uniqueness` (`cache_key`, `uid`)
+  UNIQUE `uniqueness` (`user_id`, `cache_key`, `uid`)
 );
 
 

SQL/mysql.update.sql

@@ -5,7 +5,7 @@ ALTER TABLE `messages`
   DROP `body`,
   DROP INDEX `cache_key`,
   ADD `structure` TEXT,
-  ADD UNIQUE `uniqueness` (`cache_key`, `uid`);
+  ADD UNIQUE `uniqueness` (`user_id`, `cache_key`, `uid`);
 
 ALTER TABLE `identities`
   ADD `html_signature` tinyint(1) default 0 NOT NULL;

SQL/mysql5.initial.sql

@@ -55,7 +55,7 @@ CREATE TABLE `messages` (
  PRIMARY KEY(`message_id`),
  INDEX `idx`(`idx`),
  INDEX `uid`(`uid`),
- UNIQUE `uniqueness` (`cache_key`, `uid`),
+ UNIQUE `uniqueness` (`user_id`, `cache_key`, `uid`),
  CONSTRAINT `User_ID_FK_messages` FOREIGN KEY (`user_id`)
    REFERENCES `users`(`user_id`)
      ON DELETE CASCADE

SQL/postgres.initial.sql

@@ -167,4 +167,4 @@ CREATE TABLE "messages" (
     structure text
 );
 
-ALTER TABLE "messages" ADD UNIQUE (cache_key, uid);
+ALTER TABLE "messages" ADD UNIQUE (user_id, cache_key, uid);

SQL/postgres.update.sql

@@ -3,7 +3,7 @@
 
 ALTER TABLE "messages" DROP body;
 ALTER TABLE "messages" ADD structure TEXT;
-ALTER TABLE "messages" ADD UNIQUE (cache_key, uid);
+ALTER TABLE "messages" ADD UNIQUE (user_id, cache_key, uid);
 
 ALTER TABLE "identities" ADD html_signature integer DEFAULT 0 NOT NULL;