Parallelize Postgres event parsing#57
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- Add configurable parse concurrency and default it to CPU capabilities. - Parse fetched event rows in parallel while preserving input order. - Switch event columns to `event::text` and decode from strict bytestrings. - Refactor migration streaming to keep per-index state in an `IORef`. - Add tests for ordered parallel parsing and first-error reporting. - Add a benchmark and update Cabal/Nix build inputs for the new tooling.
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event::textand decode from strict bytestrings.IORef.