feat(tables): background import for large CSVs with live progress#4861

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TheodoreSpeaks wants to merge 18 commits into

feat/1-million-table

Commits on Jun 3, 2026

feat(tables): background import for large CSVs with live progress
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fix(tables): address review — import heartbeat, overlap guard, column/empty validation
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Merge remote-tracking branch 'origin/staging' into feat/1-million-table
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fix(tables): guard sync import overlap, scope fileKey to workspace, delete-on-replace after download
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fix(tables): stream large CSV imports from storage instead of buffering the whole file
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test(tables): fix async-import route tests for workspace-scoped fileKey + name uniquification
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fix(tables): append imports start after existing rows; reconcile missed import failures in the tray
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fix(tables): delete the uploaded CSV from storage after the import finishes
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fix(tables): validate replace before deleting rows; ignore stale replayed import events by importId
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fix(tables): bind import worker to its importId (no stale-worker clobber/overlap) and destroy storage stream on failure
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feat(tables): byte-based import progress, cancel support, and a start toast that opens the import view
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fix(tables): don't emit ready after cancel; honor cancel during the upload phase
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improvement(tables): use a stop (square) icon for canceling an active import
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fix(tables): make markTableImporting an atomic claim to close the concurrent-import TOCTOU race
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improvement(tables): preview CSV import from a slice, drop client row-count warning

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claude
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fix(tables): gate import ownership every batch and stop canceled imports reappearing

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refactor(tables): drive import tray by polling derived from server, not SSE

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fix(tables): ignore superseded-run import events in the detail SSE cache

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claude
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