Add _enum_values helper and values_callable parameter to Enum columns in message models to ensure proper enum value extraction for database operations. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add Conversation, ConversationParticipant, Message, MessageAttachment models - Add ConversationType enum (admin_vendor, vendor_customer, admin_customer) - Add ParticipantType enum (admin, vendor, customer) - Add Alembic migration for messaging tables - Add MessagingService for conversation/message operations - Add MessageAttachmentService for file upload handling - Add message-related exceptions (ConversationNotFoundException, etc.) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
