Implement Face Collections Feature (Backend)

[rahulharpal1603]

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Description

Add face collections functionality similar to Google Photos, allowing users to view clustered faces and assign names to face groups.

Tasks

• Modify database schema to store one embedding per row with unique face_id
• Create new clusters table with cluster_id, cluster_name
• Cluster using DBSCAN
• Add re-clustering logic to preserve cluster names during updates
• Create API endpoints:
  • PUT /face-clusters/:id - Update cluster names
  • GET /face-clusters/ - Get all face collections
  • One more route to get all images for a specific cluster

Expected Outcome

Users can view face clusters, assign names to people, and browse images by person.