There are several proposed tags changes lingering about here on meta. I thought I'd capture them all here, each one as a separate answer, and let people vote on them.

• merge database-restoring and restore
• Scaling and scalability
• Delete hashbytes
• Make sql-agent a synonym of sql-server-agent.
• Delete schema
• Rename tuning to query-tuning and blacklist forcing explicit choice between this and database-tuning
• Rename sql to sql-language and blacklist to prevent abuse

• Make sqlcmd-mode a synonym of sqlcmd. - completed
• Rename sql-server-2011 to sql-server-2012. Make denali a synonym of sql-server-2012. - completed
• Merge locking into locks - completed
• Delete xmltype - completed
• Delete columns - completed made synonym of database-design
• Delete add-column - completed
• Delete data-migration - completed
• Delete database - completed
• Merge restore and recover - declined
• Delete query-help - completed
• Rename azure to sql-azure - completed
• Delete mysql-replication - completed
• Delete pg-restore - completed

If you downvote a suggestion please explain why in a comment.