DatabaseModule.provideDatabase ran the whole startup sequence with
runBlocking while Hilt constructed the singleton database — a DataStore
read, a Keystore op, a possible SQLCipher re-key conversion, and (since
#111) the cross-database AccountDataMigrator — synchronously on whichever
thread first injected it, which can be the main thread (jank / ANR).
Move that work behind DatabaseProvisioner.prepareCache(): a memoized,
mutex-guarded suspend that runs the same sequence, in the same order, on
the IO dispatcher. Both databases' Room builders now open through a
DeferredOpenHelperFactory whose delegate — and therefore the gate — is
materialised only when Room first OPENS the database, on its background
query executor, never at inject time. AccountDatabase's open gates on the
same prepareCache(), preserving the #111 migrate-before-open ordering that
the old construction-time dependency on LibreMailDatabase enforced.
Behaviour, ordering, and crash-safety are unchanged — only where and when
the work runs moved off the (possibly main) inject thread.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
JMR-devandClaude Fable 5
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