Metered usage records — idempotent usage events rolled up per billing period, as a Convex component

Threaded comments / annotations on any resource — post, reply, edit, resolve, and soft-delete as a Convex component

Append-only per-subject activity feed and event ledger, as a Convex component

Reactions, votes, and likes on any resource — toggle, count by kind, and list reactors as a Convex component

Hashed-secret token primitive with mint-once, TTL, revoke and scope, as a Convex component

Exactly-once idempotency key ledger for retried operations, as a Convex component

Append-only consent ledger (GDPR Art. 6/7) — record, withdraw, and gate consent per subject + purpose as a Convex component

Durable, transport-agnostic outbound transactional email queue — enqueue, retry, idempotent send, and per-message delivery status as a Convex component

Unique slug and handle registry with rename redirects, as a Convex component

Auth-agnostic membership and relationship graph (ReBAC tuples), as a Convex component

Consumable balances and economy ledger with atomic spend and lazy regen, as a Convex component

AI discoverability for Next.js sites — generate llms.txt / llms-full.txt manifests and serve any page as raw markdown

Feature flags as a Convex component — variants, targeting, percentage rollouts, and per-subject overrides, evaluated on the backend and streamed live to clients.

Invite → accept → expire flow — issue a single-use, expiring invitation to a resource and consume it, as a Convex component

Per-subject directed inbox — deliver notifications with read/unread state and fan-out as a Convex component

Typed host-side helpers for Convex backends — builders, errors, validators, relationships, pagination, HTTP, env, and observability.

Deterministic A/B experimentation — sticky variant assignment and deduped exposure tracking, as a Convex component

Do-not-contact suppression list + opt-in proof (GDPR/CAN-SPAM), hash-keyed and channel-aware, as a Convex component

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