Link Preview Analytics #484
Description
Context:
OG metadata extraction happens on-demand but isn't indexed during post processing. OG metadata should be processed during indexation for analytics purposes (ranking popular shared links, social graph analysis), separate from preview rendering. This is follow-up to #430
Acceptance Criteria:
- OG metadata is extracted during post indexing (reader-main)
- OG metadata (title, description, image URL) is stored in posts table
- Aggregation queries for popular shared links are implemented
- API endpoint for link popularity/ranking exists
- Existing edge function approach for preview rendering is maintained
- Analytics data is separate from preview rendering (indexed vs on-demand)