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constructive-realtime

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更新时间2026年7月2日 07:36

Subscriptions, notifications, change_log, CursorTracker, ephemeral realtime — real-time data via GraphQL subscriptions, PostGraphile live queries, change tracking, and ephemeral pg_notify delivery. Use when asked to 'add subscriptions', 'real-time updates', 'live queries', 'notifications', 'change_log', 'CursorTracker', 'websocket', 'ephemeral realtime', 'pg_notify', 'high-frequency signals', or when working with real-time features in Constructive.

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来源

constructive-io

constructive-io/constructive-skills

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Constructive Realtime

Real-time data delivery via GraphQL subscriptions, live queries, and change tracking.

When to Apply

Use this skill when:

Adding real-time subscriptions to a Constructive app
Working with PostGraphile live queries
Implementing change tracking and notifications
Using WebSocket connections for real-time updates
Using ephemeral realtime for high-frequency signals (cursors, presence, live indicators)

Core Concepts

GraphQL Subscriptions

PostGraphile v5 provides built-in subscription support via WebSocket (graphql-ws protocol). Subscriptions are automatically generated for any table with appropriate grants.

Live Queries

PostGraphile's @stream and @live directives enable:

Live queries — auto-refresh results when underlying data changes
Streaming — progressive delivery of large result sets

Change Tracking

The change_log system records row-level changes (INSERT, UPDATE, DELETE) that power both subscriptions and audit trails.

Ephemeral Realtime

DataRealtime({ ephemeral: true }) bypasses change_log entirely — events go straight from trigger → pg_notify → WebSocket with zero write overhead. Designed for high-frequency signals (cursor positions, presence indicators, live typing) where durability isn't needed.

References

File	Content
realtime-subscriptions.md	Full subscription setup, WebSocket config, ephemeral mode, and patterns

Cross-References

Server configuration: constructive-platform
Generated hooks (React Query): constructive-hooks
Events and tracking: constructive-events

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name	constructive-realtime
description	Subscriptions, notifications, change_log, CursorTracker, ephemeral realtime — real-time data via GraphQL subscriptions, PostGraphile live queries, change tracking, and ephemeral pg_notify delivery. Use when asked to 'add subscriptions', 'real-time updates', 'live queries', 'notifications', 'change_log', 'CursorTracker', 'websocket', 'ephemeral realtime', 'pg_notify', 'high-frequency signals', or when working with real-time features in Constructive.
metadata	{"author":"constructive-io","version":"1.0.0"}