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feat(messaging): digest batching for notifications (ADR-0030 P3b-2) - #1582
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Recipients can batch a topic into a daily/weekly digest instead of receiving every notification immediately. Builds on P3b-1's deferral seam: - PreferenceResolver consumes the `digest` field; digestDeferral() defers a batched recipient to the next window (local midnight / Monday 00:00) and tags the target with a stable window. Digest takes precedence over quiet-hours; critical + mandatory topics bypass it. - sys_notification_delivery gains digest_key (recipient|channel|window). Batched rows partition by that key so a window co-locates; normal claim() skips them and the new claimDigest() drains a window whole (memory + sql outbox). - The dispatcher's digest pass collapses each (recipient, channel, window) group into one renderDigest() message under the per-partition lock, then acks every row in the group with that single outcome. Additive — non-digest delivery is unchanged. +13 tests (127 total). tz-from- sys_user, configurable send-hour, and MJML digest emails are deferred follow-ups. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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This was referenced Sep 5, 2026
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Completes ADR-0030 P3b-2 — the digest middleware the platform declared in P2 (
sys_notification_preference.digest) but never consumed.What
Recipients can batch a topic into a
daily/weeklydigest instead of getting every notification immediately. Builds directly on P3b-1's deferral seam.digestfield.digestDeferral()defers a batched recipient to the next window (local midnight for daily, Monday 00:00 for weekly) and tags the target with a stablewindowlabel. Digest takes precedence over quiet-hours;criticaland mandatory topics bypass it entirely.sys_notification_deliverygainsdigest_key(recipient|channel|window) + a grouping index. Batched rows partition by that key so a window's rows co-locate in one partition; the normal outboxclaim()skips them and a newclaimDigest()drains a window whole (implemented in both memory + sql outbox).digest_key, and collapses each(recipient, channel, window)group into onerenderDigest()message, then acks every row in the group with that single outcome (failure re-defers the whole group).Partition-by-
digest_key+ the existing lock means exactly one node assembles each digest — no double-send across a cluster.Scope
Additive: non-digest notifications are completely unchanged. Deferred follow-ups (noted in the ADR): timezone fallback to a
sys_userfield (windows currently usequiet_hours.tz→ UTC), a configurable daily send-hour, and MJML digest emails.Tests
+13 (
127total in service-messaging):digestDeferraldaily/weekly + tz; resolver stamps window + precedence + critical bypass;renderDigestcollapse; outboxclaim/claimDigestseparation + window deferral; end-to-end dispatcher collapse (3 rows → 1 message, all acked) + group re-defer on failure.🤖 Generated with Claude Code