feat(messaging): add direct messaging backend (conversations, cursor … - #72
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Conversation
…messages, read state) Adds a production-shaped DM stub: get-or-create conversations by unique fan/creator pair, participant-only authz, cursor-paginated inbox and message lists, idempotent sends (clientId/Idempotency-Key), read receipts, a per-user rate-limit guard, and soft-deleted-user blocking.
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closes #50
Implemented the backend foundation for the Direct Messaging system, introducing secure conversation management, message exchange, cursor-based pagination, read receipts, and essential abuse protection.
What Changed
Added Conversation and Message entities.
Implemented get-or-create conversation flow to ensure unique fan–creator conversations.
Added inbox and message retrieval endpoints with cursor-based pagination.
Implemented message sending with idempotency support (Idempotency-Key/clientId).
Added endpoint to mark messages as read.
Enforced participant authorization to prevent unauthorized access.
Added request validation for message content.
Implemented rate limiting for message sending.
Prevented soft-deleted users from creating new messages.
Documented conversation access behavior to avoid information leakage.
Added comprehensive test coverage for conversation creation, messaging, pagination, read receipts, idempotency, authorization, validation, rate limiting, and authentication.
Impact
This PR delivers a production-ready backend stub for direct messaging, providing a secure and scalable API that supports the frontend messaging experience while establishing the foundation for future real-time messaging features.