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499abd927f
* persist LC data across restarts With the Altair spec `LightClientUpdate` structure taking its final form it is finally possible to persist LC data across restarts without having to worry about data migration due to spec changes. A separate `lcdataV1` database is created in the `caches` subdirectory to hold known LC data. A full database with default settings (129 periods) uses <15 MB disk. * extend LC data DB rationale * wording * add `isSupportedBySQLite` helper and explicit return * remove redundant `return`