First increment of the importer (docs/superpowers/specs/2026-06-01-bulk-import-design.md):
the three port-scoped tables, no changes to entity tables.
- import_batches — one row per run: entity_type, filename, storage_key,
status, conflict_policy, mapping_json, live counts, created_by, timestamps.
- import_batch_rows — per-row action ledger (inserted/updated/skipped/errored)
with entity_id + error; partial index on inserted rows powers Undo.
- import_mappings — saved column mappings, unique per (port, entity, name).
Migration 0090 applied via psql; schema re-exported from the index.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>