Project-scoped users (email unique per project) — possible?
Next.js🤔QuestionHey 
I’m building a multi-tenant platform where each project is a standalone website (Shopify-style).
For project users (customers / blog members) I need:
Separate accounts per project
Same email usable on multiple projects
Credentials, sessions, password resets fully isolated per project
Email uniqueness = (project_id, email), not global
I understand Better Auth assumes a global user identity and that Organizations are for roles/membership, not credential isolation.
Questions:
Is this possible with Better Auth at all?
Would it require a custom adapter, or is it fundamentally incompatible?
Can plugins influence user lookup/uniqueness, or is that adapter-level only?
If unsupported, is the recommended approach to use Better Auth only for platform users and handle project auth separately?
Thanks!
I’m building a multi-tenant platform where each project is a standalone website (Shopify-style).
For project users (customers / blog members) I need:
Separate accounts per project
Same email usable on multiple projects
Credentials, sessions, password resets fully isolated per project
Email uniqueness = (project_id, email), not global
I understand Better Auth assumes a global user identity and that Organizations are for roles/membership, not credential isolation.
Questions:
Is this possible with Better Auth at all?
Would it require a custom adapter, or is it fundamentally incompatible?
Can plugins influence user lookup/uniqueness, or is that adapter-level only?
If unsupported, is the recommended approach to use Better Auth only for platform users and handle project auth separately?
Thanks!
