Schema V1 (Deprecated)

V1 is deprecated and read-only as of v1.5.0. Reads, Suggest, and Info work, and MigrateV1ToV2 converts a collection in place, but Add and Remove return ErrV1ReadOnly. Flush still works and still deletes every key — read-only refuses keyword writes, it does not protect the collection. V1 gains no features: preset engines and EnableCache both require V2. The read path stays for the whole v1 line and is removed no earlier than v2.

V1 spreads one collection across many keys — roughly 5 per 100 keywords.

Key pattern	Purpose
`{name}:keyword`	Set of keywords
`{name}:prefix`	Trie prefix edges
`{name}:suffix`	Trie suffix links
`{name}:output:{state}`	Output keywords per state
`{name}:node:{keyword}`	Node metadata

Find() costs O(N×3-5) round trips for N visited states. Add() cost O(M×3-10) for a keyword of length M — no longer reachable, and recorded only to explain what migration is worth. Compare against Schema V2.

Migrating

acor -name mycollection migrate --dry-run   # preview
acor -name mycollection migrate             # execute
acor -name mycollection migrate-rollback    # back to V1