feat: add public endpoint to create member identity (CM-1070)

[skwowet]

Summary

• Add POST /api/v1/members/:memberId/identities endpoint to create member identities
• Add returnRows support to insertManyMemberIdentities/prepareBulkInsert DAL methods
• Conflict detection: 409 if identity exists on same member or is verified on another member
• Unverified duplicates on other members are allowed (picked up by merge suggestions)

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Note

Medium Risk
Adds a new public write endpoint and changes identity-conflict checks and insert semantics; mistakes could allow duplicate/incorrect identity association or affect callers relying on bulk insert behavior.

Overview
Adds POST /api/v1/members/:memberId/identities to create a member identity with request validation, audit logging, and updatedAt touch to trigger merge suggestions.

Updates identity conflict detection to use a renamed/expanded DAL helper (checkMemberIdentityExistence) that can filter by type and returns verified, and enforces 409s when the identity already exists on the member or is verified on another member.

Extends DAL bulk insert helpers (prepareBulkInsert, insertManyMemberIdentities, createMemberIdentity) with optional RETURNING * support so the new endpoint can return the inserted identity row.

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[Copilot]

Pull request overview

This PR adds a new public API endpoint to create member identities and extends DAL bulk-insert helpers to optionally return inserted rows, enabling the endpoint to return the created identity while enforcing conflict rules.

Changes:

• Add POST /api/v1/members/:memberId/identities public endpoint with conflict detection and audit logging.
• Extend prepareBulkInsert and member-identity insert DAL functions to support RETURNING * via a returnRows flag.
• Rename/extend identity-existence check to optionally filter by identity type and include verified status.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
services/libs/data-access-layer/src/utils.ts	Adds optional RETURNING * support to bulk insert query builder.
services/libs/data-access-layer/src/members/identities.ts	Adds typed identity existence check with optional type filter and returnRows support for bulk insert.
backend/src/services/member/memberIdentityService.ts	Updates service to use the renamed identity existence check helper.
backend/src/api/public/v1/members/index.ts	Registers new public POST route for creating identities.
backend/src/api/public/v1/members/identities/createMemberIdentity.ts	Implements the new public endpoint with validation, conflict checks, insert, and response mapping.

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