temporal-caching

Included with Lifetime

$97 forever

Efficient data loading patterns using system_from/system_to for cache validation. Use when implementing incremental sync, conditional fetches, polling for changes, ETags, high watermarks, or avoiding redundant data transfer in systems with temporal tables.

General

What this skill does


# Temporal Caching

System-time versioned tables give you a built-in cache validator: `system_from` changes whenever a record is updated. This eliminates the need for separate version columns, ETags tables, or change-tracking infrastructure.

Three patterns leverage this at different granularities:

## Global Watermark

Client stores the maximum `system_from` seen across an entire collection. On each poll, asks "give me everything newer than X." Empty result means nothing changed — no data transfer needed.

**Best for:** feeds, dashboards, lists sorted by recency where you need to detect _any_ change across a large collection.

[Full pattern →](./global-watermark.md)

## Predicate Watermark

The "one" side of a one-to-many relationship stores the maximum `system_from` of its children as a denormalized column. Clients can check this single value before deciding whether to fetch the entire child collection.

**Best for:** parent-child relationships where fetching all children is expensive but checking the parent is cheap.

[Full pattern →](./predicate-watermark.md)

## Item Watermark

Client sends the last-known `system_from` for a specific item in the request header. Server returns HTTP 304 if the item hasn't changed. Maps directly to standard HTTP conditional request semantics (ETags).

**Best for:** individual resource endpoints where clients repeatedly fetch the same item.

[Full pattern →](./item-watermark.md)

## Choosing a Pattern

| Scenario                                      | Pattern             | Why                                            |
| --------------------------------------------- | ------------------- | ---------------------------------------------- |
| "Show me what's new since I last checked"     | Global watermark    | One query covers the whole collection          |
| "Have any of this user's blueprints changed?" | Predicate watermark | Avoids fetching all blueprints to find out     |
| "Give me blueprint X if it changed"           | Item watermark      | Standard HTTP caching for single resources     |
| Feed page with detail drill-down              | Global + Item       | Global for the list, item for individual views |

Files: 4

Size: 20.3 KB

Complexity: 28/100

Category: General

Source: https://github.com/motlin/claude-code-plugins/tree/main/plugins/temporal-data/skills/temporal-caching

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