fix: Enable WAL mode and set busy timeout for SQLite #31
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Description
This PR addresses the issue where the database could become locked during concurrent operations (e.g., watcher running while searching). It enables Write-Ahead Logging (WAL) mode for SQLite and sets a busy timeout to handle lock contention more gracefully.
Changes
Verification
I reproduced the issue with a test script that simulated concurrent read/write operations, which failed with 'database is locked'. After applying the fix, the test passed successfully. Existing tests also pass.