After backfill completes for a blog, -likes can now pick up only newer
likes instead of being a one-shot pull. Tracks a per-blog
liked_timestamp high-water mark and stops the refresh walk once it
crosses the stored mark. A configurable cooldown (LikesRefreshCooldownDays,
default 7) gates which blogs are re-checked on each run. -force bypasses
the cooldown.
The migration adds three columns to Blogs (LikesNewestTimestamp,
LikesLastRefreshed, LikesLastNewCount) and does a one-time reset of all
likes tracking state so the new high-water mark starts from a clean
baseline. Existing ByLikes posts remain; the UNIQUE constraint absorbs
re-inserts during the first re-backfill.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
jimandClaude Sonnet 4.6
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