Sync

• Add bulk sync functionality:
  • New sync() Express middleware atomically synchronises a table with the full provided row list inside a single PostgreSQL transaction (BEGIN / COMMIT / ROLLBACK on failure)
  • Incoming rows without an ID (or with an unknown ID) are inserted; rows with a known ID are updated; existing rows absent from the list are deleted
  • Accepts optional idField in request body (defaults to 'id') to specify the identity column
  • Accepts optional filters in request body to scope the managed set — rows outside the filter are never touched
  • Returns synced rows with generated IDs in res.locals.rows
  • Returns operation summary { inserted, updated, deleted } in res.locals.sync
  • Supports consumerId / consumerName forwarding for history tracking on inserts and updates
• Add syncArraySubstack getter returning [normalizeArray, validateArray, sync] middleware chain