# No external dependencies required - using Python standard library only
# The employee directory system is built using only built-in Python modules:
# - sqlite3 (built-in database)
# - hashlib (built-in cryptography)
# - datetime (built-in date/time handling)
# - json (built-in JSON processing)
# - os (built-in operating system interface)
# - shutil (built-in file operations)
# - tempfile (built-in temporary file creation)
# - unittest (built-in testing framework)
# - unittest.mock (built-in mocking for tests)