Implement two significant changes to improve content moderation and thread integrity: 1. Admin Reports System - Add off-protocol content reporting for serious issues (CSAM, doxing, etc.) - New endpoint: POST /xrpc/social.coves.admin.submitReport - Rate limited to 10 requests/minute, requires OAuth authentication - Full stack: handler, service, repository, and database migration 2. Preserve Deleted Comment Thread Structure - Deleted comments now appear as "[deleted]" placeholders instead of being hidden - Comment counts are preserved on deletion to maintain accurate thread totals - Nested replies now properly increment root post's comment_count - Improved resurrection handling to avoid double-counting when same parent 3. Error Handling Improvements - serializeOptionalFields() now returns errors instead of silently ignoring failures - Reconciliation failures now roll back transactions (previously just logged warnings) - Post consumer uses errors.Is() for proper error type checking Changes: - Add internal/api/handlers/adminreport/* for report submission - Add internal/core/adminreports/* for domain logic and errors - Add internal/db/postgres/admin_report_repo.go for persistence - Add migration 028_create_admin_reports_table.sql - Update comment_consumer.go to preserve counts on delete - Update comment_repo.go to include deleted comments in queries - Update post_consumer.go error handling and nested reply counting - Update tests to verify new placeholder behavior Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>