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store: embed --if-changed pattern: compare ID sets to skip unnecessary work

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Cal Corum 2026-02-19 14:53:28 -06:00
parent b3023a9bf7
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---
id: 20b22fc6-bf36-420d-ae9d-a67beba3a209
type: code_pattern
title: "embed --if-changed pattern: compare ID sets to skip unnecessary work"
tags: [cognitive-memory, python, pattern, optimization]
importance: 0.5
confidence: 0.8
created: "2026-02-19T20:53:28.365333+00:00"
updated: "2026-02-19T20:53:28.365333+00:00"
---
The `--if-changed` flag on `claude-memory embed` compares the set of memory UUIDs in _index.json against _embeddings.json. If the sets match (no new or deleted memories), it returns immediately with `{"skipped": true}` in ~0.1s. Also checks for provider changes (which force a full re-embed due to dimension mismatch). Pattern: load both files, compare `set(index_entries.keys()) == set(embedding_entries.keys())`. Simple, fast, and avoids unnecessary Ollama API calls. Useful for any timer-driven task that should be idempotent.