Returns a signed Supabase URL for the image identified by imageId.
The cached signed URL is reused if still valid; otherwise a new one is generated and persisted.
Requires read access to the document the image belongs to.
Returns a signed Supabase URL for the image identified byDocumentation Index
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imageId.
The cached signed URL is reused if still valid; otherwise a new one is generated and persisted.
Requires read access to the document the image belongs to.