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fts_backend_init(const char *backend_name, struct mailbox *box);
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void fts_backend_deinit(struct fts_backend **backend);
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int fts_backend_get_last_uid(struct fts_backend *backend, uint32_t *last_uid_r);
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/* Initialize adding new data to the index. last_uid_r is set to the last UID
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that exists in the index. */