Move from max( id ) to max( index ) for latest commit statuses (#30076)
#30155
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…o-gitea#30076) This PR replaces the use of `max( id )`, and instead using ``max( `index` )`` for determining the latest commit status. Building business logic over an `auto_increment` primary key like `id` is risky and there’re already plenty of discussions on the Internet. There‘s no guarantee for `auto_increment` values to be monotonic, especially upon failures or with a cluster. In the specific case, we met the problem of commit statuses being outdated when using TiDB as the database. As [being documented](https://docs.pingcap.com/tidb/stable/auto-increment), `auto_increment` values assigned to an `insert` statement will only be monotonic on a per server (node) basis. Closes go-gitea#30074.
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Backport #30076.
This PR replaces the use of
max( id ), and instead usingmax( `index` )for determining the latest commit status. Building business logic over anauto_incrementprimary key likeidis risky and there’re already plenty of discussions on the Internet.There‘s no guarantee for
auto_incrementvalues to be monotonic, especially upon failures or with a cluster. In the specific case, we met the problem of commit statuses being outdated when using TiDB as the database. As beingdocumented,
auto_incrementvalues assigned to aninsertstatement will only be monotonic on a per server (node) basis.Closes #30074.