[T3304] REFACTOR: serve letter previews as image instead of wkhtmltopdf PDF - #361
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Danielgergely
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Aug 5, 2026
Danielgergely
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- REFACTOR: The letters page rendered a full PDF per card via /b2s_image -> wkhtmltopdf. Several concurrent renders starve the worker pool (wkhtmltopdf calls back for assets with no free worker) and freeze the instance. Serve the first page as an image via /my2/letter_preview instead: no subprocess, no callback, so previews load concurrently without wedging workers. /b2s_image stays for opening/downloading the full PDF.
…df PDF - REFACTOR: The letters page rendered a full PDF per card via /b2s_image -> wkhtmltopdf. Several concurrent renders starve the worker pool (wkhtmltopdf calls back for assets with no free worker) and freeze the instance. Serve the first page as an image via /my2/letter_preview instead: no subprocess, no callback, so previews load concurrently without wedging workers. /b2s_image stays for opening/downloading the full PDF.
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