Tagged “metadata”
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Deletion is the hard one
Removing a source file removes nothing downstream. Everything derived from it persists, stays retrievable, and answers questions as though it still existed.
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Keeping an index fresh
A full rebuild is correct and unaffordable. Incremental sync is affordable and drifts. What decides the difference is how you detect that something changed.
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The same document three times
Identical copies, near-copies and successive versions look alike and need opposite treatment. Deduplicating a version history destroys the record.