- New caching_custom_backfill_jobs and caching_custom_backfill_batches tables
- Admin API (POST create/cancel, GET list) at admin/api/custom_backfill.php
- Admin UI form with preset buttons and job status table on Backfill page
- Caching daemon module (custom_backfill.c) processes jobs independently
- pg_inbox functions for job/batch claim, progress update, and cancel
- Three batch modes: author-batched, id-batched, time-window scan
- Fixed done_batches overcount on job completion
- Admin config now environment-variable driven (C_RELAY_DB_*)
- admin/serve.sh supports separate instances for different databases
- make_and_restart_relay.sh only kills relay on target port, not all relays
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