Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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I found `oauth2_authentication_request`  have subject column, that contains value related to data I sent via API. sometimes blank, sometime have value. Could you please explain for How it work?

Sometimes user already has an authenticated session and this saved subject will allow you to do the “remember me” auto-login flow.