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. 

Awaiting Review
=

 - [make `database-backup` a synonym of `backup`][1]
 - [merge `database-restoring` and `restore`][2]
 - [`Scaling` and `scalability`][3]
 - [Delete `hashbytes`][4]
 - [Make `sql-agent` a synonym of `sql-server-agent`.][5]
 - [Delete `schema`][6]
 - [Rename `tuning` to `query-tuning` and blacklist forcing explicit choice between this and `database-tuning`][7]
 - [Rename `sql` to `sql-language` and blacklist to prevent abuse][8]

---

Completed
=

 - [Make `sqlcmd-mode` a synonym of `sqlcmd`.][9] - **completed**
 - [Rename `sql-server-2011` to `sql-server-2012`. Make `denali` a synonym of `sql-server-2012`.][10] - **completed**
 - [Merge `locking` into `locks`][11] - **completed**
 - [Delete `xmltype`][12] - **completed**
 - [Delete `columns`][13] - **completed**  made synonym of [tag:database-design]
 - [Delete `add-column`][14] - **completed**
 - [Delete `data-migration`][15] - **completed**
 - [Delete `database`][16] - **completed**
 - [Merge `restore` and `recover`][17] - **declined**
 - [Delete `query-help`][18] - **completed**
 - [Rename `azure` to `sql-azure`][19] - **completed**
 - [Delete `mysql-replication`][20] - **completed**
 - [Delete `pg-restore`][21] - **completed**

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


  [1]: https://dba.meta.stackexchange.com/a/953/2660
  [2]: https://dba.meta.stackexchange.com/a/615/1396
  [3]: https://dba.meta.stackexchange.com/a/582/2660
  [4]: https://dba.meta.stackexchange.com/a/567/1396
  [5]: https://dba.meta.stackexchange.com/a/543/2660
  [6]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/409#409
  [7]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/483#483
  [8]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/484#484
  [9]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/474#474
  [10]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/456#456
  [11]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/453#453
  [12]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/435#435
  [13]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/410#410
  [14]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/406#406
  [15]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/388#388
  [16]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/392#392
  [17]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/386#386
  [18]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/385#385
  [19]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/384#384
  [20]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/383#383
  [21]: https://dba.meta.stackexchange.com/questions/382/tag-cleanup-vote-for-the-following-proposed-tag-changes/387#387