Pablo Martin d1e7f8c986 wallet: use in-memory SQLite for temporary wallet in exportwatchonlywallet ...

The intermediate watchonly wallet created during exportwatchonlywallet is
a pure build artifact — it is always discarded once BackupWallet() copies
it to the destination. Creating it as an in-memory SQLiteDatabase
(SQLITE_OPEN_MEMORY) removes the need to write files to the wallets
directory and eliminates the cleanup handler that deleted those files on
both success and failure paths.

Introduces InMemoryWalletDatabase (a minimal SQLiteDatabase subclass) and
MakeInMemoryWalletDatabase() factory in sqlite.h/cpp, following the same
pattern as MockableSQLiteDatabase / CreateMockableWalletDatabase() in the
test utilities. MockableSQLiteDatabase now derives from InMemoryWalletDatabase,
removing its redundant Files() override.

The wallet is named after the source wallet ("<name>_watchonly_temp") so
concurrent exports of different wallets use distinct names and log lines
remain traceable to the source wallet.

2026-07-08 19:03:58 -03:00

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