GET /api/aliases/check

Checks whether a handle alias is available for registration. Queries the global SESSION_DB D1 database directly.

Query parameters

Parameter	Type	Required	Description
`alias`	`string`	Yes	Handle to check (lowercased before lookup)

{ "available": true }

{ "available": false, "did": "did:new:0x..." }

Code	`error`	Condition
`400`	`"Missing query parameter: alias"`	Parameter absent