The ResponseStore.get() method calls json.loads(row[0]) without any
error handling. If the SQLite responses table contains corrupted JSON
data (e.g. from a crash mid-write or disk corruption), this raises
an unhandled JSONDecodeError that propagates to the caller.
Fix: wrap in try/except (json.JSONDecodeError, TypeError). On parse
failure, log a warning, evict the corrupted entry from the cache, and
return None (consistent with the function's Optional return type).
f7dabd3019