The dataflow is as follows: A user runs a command in a cell, the command is sent to the server, the server determines which cells will be affected by the code changes in the payload, evaluates the code, updates related cells, and the results are sent back via server side event (SSE) streaming.
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The second bug is responsible for the 1,857x on INSERT. Every bare INSERT outside a transaction is wrapped in a full autocommit cycle: ensure_autocommit_txn() → execute → resolve_autocommit_txn(). The commit calls wal.sync(), which calls Rust’s fsync(2) wrapper. 100 INSERTs means 100 fsyncs.
And its sidecar is: