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app.graph.arrow stages rows as Arrow VectorSchemaRoots and COPYs from them. No file is written at any point and no value is rendered as text for the engine to re-parse, so the defect class that produced three of this branch's four backend defects cannot recur. app.graph.bulk is deleted whole. csv-representable?, defer-to-cypher?, multiline?, fixup-statements, ladybug-literal, ladybug-list-element, ladybug-list-cell and staging-dir go with it, along with the post-COPY Cypher pass that emitted one SET per row. Measured before deciding: the fixup pass was ~77% execution, 16-22% parse and 6-7% round-trip, and prepared statements could not have recovered any of it — every fixup row carries a MAP column and Ladybug binds scalars only. So this replaces rather than optimizes. Marginal ingest 4.0 -> 1.21 ms/shape; ~25 s extrapolated at 20k shapes against the ~2 min the CSV path projected. Size unchanged. Four engine facts the implementation rests on, each verified against 0.18.2 with a standalone probe: - An Arrow table is not a COPY source identifier but is a MATCH-able node label. - A MAP vector's entries child must be a non-nullable struct, and MapVector.getWriter promotes it to a sparse union, so map vectors are built from an explicit Field and filled child-first. - Ladybug names a staged table's columns and struct fields from the Arrow field names and quotes none of them, so anything needing quotes must arrive quoted — hence cypher-property-key, not column-name, names the Arrow fields. - createArrowRelTable cannot resolve endpoints against a UUID-keyed node table under any encoding, so edges stage as a node table and the COPY subquery joins them. values/coerce is reused unchanged, so the Arrow and Cypher writers cannot disagree about a value's shape; nodes/column-map-key-fn is extracted so they cannot disagree about a MAP's key spelling either. Verified with pytest --graph-origin=penpot-only unchanged at 225/38/1 and --graph-origin=penpot unchanged at 258 passed / 2 pre-existing failures, both baselines re-established against a reverted backend rather than assumed; with bp graph diff between a CSV-built and an Arrow-built graph reporting "Graphs agree"; and with an adversarial round-trip carrying a quote, a backslash, a newline, a CRLF and a tab through STRING, STRING[] elements and MAP values. The diff was necessary, not belt-and-braces: both parity suites passed an earlier revision of this change that was writing EDN into every JSON column, because beadpot's assertions never parse those columns. It also showed Arrow correcting a CSV defect — an empty Component.path was being stored as NULL, because Ladybug's CSV reader cannot distinguish an empty field from an absent one.