Raised when a mid-stream fetch fails and the stream was opened with on_error: :raise (the default mode of Xqlite.stream/4).

Streaming is the one place where xqlite departs from its tuples-only contract: Stream.resource/3 cannot hand an error back to the consumer as a return value, so the default surfaces mid-fetch failures as this exception (mirroring how Ecto/DBConnection streams behave). The structured failure is preserved verbatim in :reason (an Xqlite.error_reason/0 term such as {:utf8_error, column, detail}) so callers can inspect it; :message is always a human-readable binary derived from that reason.