Fix datastore cache failure modes

[satyakigh]

Summary

• Added application-specific keys for FileDB v4 and LMDB v7. The new keys do not use hostname, CPU, storage path, or other mutable identifiers, preventing environment changes from making cached data undecryptable.
• Added targeted FileDB cache reloads. On an in-memory cache miss, FileDB checks the deterministic file directly, allowing a process to see cache entries written by another process without scanning the entire directory.
• Removed directory scanning from FileDB.stats(). This prevents the one-minute telemetry cycle from repeatedly scanning the cache directory and producing ENFILE errors when the host file table is exhausted.

[github-code-quality]

Code Coverage Overview

Languages: TypeScript

TypeScript / code-coverage/vitest

The overall line coverage in commit 130cc7d in the fix/filedb-targeted-... branch remains at 90%, unchanged from commit a1a3d82 in the main branch.

Show a line coverage summary of the most impacted files.

File	main a1a3d82	fix/filedb-targeted-... 130cc7d	+/-
src/datastore/f...yedFileStore.ts	98%	97%	-1%
src/datastore/f...e/Encryption.ts	100%	100%	0%
src/utils/MachineKey.ts	86%	89%	+3%
src/datastore/lmdb/Utils.ts	67%	100%	+33%

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_{Updated September 02, 2026 21:20 UTC}