id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
28053	Allow fields to specify arbitrary indexes via db_index=Index()	Marc Tamlyn	Aman Pandey	"Expand `Field.db_index` to allow explicitly setting an index.

Syntax would look something like:

`HStoreField(db_index=GinIndex())`

Changes needed:
- Indexes won't necessarily receive fields initially.
- Fields are responsible for their own indexes. This is tackled here and has implications for #27859, `_like` indexes on Postgres, and other situations where we customise the indexes. It is possible, but I'm not sure, that `Field.get_indexes()` could also handle unique conditions, but I think it's better kept separately as not all databases consider uniqueness to be an index.
- Change to `SchemaEditor.alter_field` so it receives the `to_model`, so that the `Index` can resolve the correct column names. This is extra important for `db_index` being a functional index (see #26167), although that's not currently supported in the current data."	New feature	assigned	Database layer (models, ORM)	dev	Normal		indexes migrations	Markus Holtermann	Accepted	1	0	0	1	0	0