Exception raised or returned when a turso operation fails.

• message — the reason string produced by the native layer (or by Turso itself for validation errors)
• code — a coarse error class for programmatic handling:
  • :busy — the database is locked; the operation may be retried
  • :constraint — a constraint (UNIQUE, NOT NULL, ...) was violated
  • :io / :corrupt — the connection is unusable; the pool drops and replaces it
  • :misuse — the API was used incorrectly
  • :invalid_param — a bound parameter had an unsupported type
  • :error — any other native error
  • nil — the error originated in the Elixir layer, not the NIF