Horus collection service
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accounts loaded: 212191

POST /annotate  raw HomeTimeline JSON -> annotated JSON
POST /google    {url, html}
POST /chatgpt   {conversationId, messages, ...}
POST /survey    {gender?, age?, submittedAt}
GET  /metrics   (X-Horus-Uid -> personalized, else global)
GET  /missing   most-frequently-missing accounts