Trimtabist
The US Trade Ledger — every US container gateway, every partner country, every month. Census-recorded, AIS-verified.
TT-008 · Port ledger

Census restatements observed, by month of data

tt008.revisions.count observed

How many figures Census has restated or withdrawn, keyed to the MONTH THE DATA DESCRIBES rather than when we noticed. Shows which months keep moving after publication. Excludes backfill — our own columns arriving is not a source change.

Withdrawn from publication

NO OBSERVATIONS YET. The archive holds 20,618 entries and every one is a `backfill` — our own air_weight_kg column arriving for the first time — with zero genuine restatements. A revision can only be observed by re-fetching a month we already hold and finding it changed, and until 2026-07-30 nothing did that: the weekly timer ran a superseded collector that crashed against the migrated schema. It now re-syncs the last six months every Friday. Lift when the archive holds genuine `revision` or `withdrawn` entries across at least a few distinct months — not on the first one, which could be a one-off.

· from 1970-01-01 · open-ended · the data is not served while this stands.

Unit
restatements
Grade
observed
Horizon
long
Covers
2026-07-30 → now

Own-recorded live from terrestrial AIS (aisstream.io receiver network); the recording, timestamps and event derivation are ours. Source: undefined.

Cite this

Trimtab TT-008 Port ledger, "Census restatements observed, by month of data" (retrieved 2026-08-06).
Trimtabist TT-008 Port ledger revision archive. Every figure is compared against what we previously held; the prior value is preserved before any update. Method: portledger/METHOD.md. Grade: observed — this measures OUR OWN record of the source changing, not a figure the source published.
Licence CC BY 4.0

Machine readable

Updated: 2026-08-06 (regenerated on every request from the live registry)
/series/tt008.revisions.count.csv — tidy long format
/series/tt008.revisions.count.metadata.json — provenance, coverage, citation
POST /mcp — query_series, describe_series