feat(frontier): add SetProjectMemberRole RPC

[whoAbhishekSah]

Summary

• Add SetProjectMemberRole RPC for atomic role assignment on project members
• Add request/response message definitions with UUID validation

Related: raystack/frontier#1461

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: fc6e811f-8e98-4a97-b706-6db54e062ab0

📥 Commits

Reviewing files that changed from the base of the PR and between 5a189cc and 22a0b96.

📒 Files selected for processing (1)

• raystack/frontier/v1beta1/frontier.proto

✅ Files skipped from review due to trivial changes (1)

• raystack/frontier/v1beta1/frontier.proto

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📝 Walkthrough

Walkthrough

Added a new RPC method SetProjectMemberRole to raystack.frontier.v1beta1.FrontierService in frontier.proto. The RPC accepts SetProjectMemberRoleRequest with project_id (UUID), principal_id (UUID), principal_type (non-empty string), and role_id (UUID) (all with validation annotations) and returns an empty SetProjectMemberRoleResponse. No other RPCs or existing messages were changed.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant FrontierService
    participant RoleStore
    participant Database

    Client->>FrontierService: SetProjectMemberRole(request)
    FrontierService->>RoleStore: Validate request & authorize caller
    RoleStore->>Database: Upsert member-role for project (project_id, principal_id, principal_type, role_id)
    Database-->>RoleStore: Persisted
    RoleStore-->>FrontierService: Acknowledgment
    FrontierService-->>Client: SetProjectMemberRoleResponse

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Suggested reviewers

• rsbh

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and clearly describes the main change: adding a new SetProjectMemberRole RPC to the FrontierService.
Description check	✅ Passed	The description is directly related to the changeset, mentioning the SetProjectMemberRole RPC addition and UUID validation implementation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[github-actions]

The latest Buf updates on your PR. Results from workflow Validate / validate (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	✅ passed	✅ passed	Apr 1, 2026, 6:26 AM

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@raystack/frontier/v1beta1/frontier.proto`:
- Around line 2063-2068: The validation options on SetProjectMemberRoleRequest
are using the wrong extension (validate.rules); update each field to use the
buf.validate.field extension like the SetOrganizationMemberRoleRequest example:
replace occurrences such as [(validate.rules).string.uuid = true] with
[(buf.validate.field).string.uuid = true] for project_id, principal_id and
role_id, and replace [(validate.rules).string.min_len = 1] with
[(buf.validate.field).string.min_len = 1] for principal_type so the proto uses
buf.validate.field for all field validations.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d16751c9-86b4-4eb6-903a-7280dd01528e

📥 Commits

Reviewing files that changed from the base of the PR and between c56df54 and 5a189cc.

📒 Files selected for processing (1)

• raystack/frontier/v1beta1/frontier.proto