Add July 2026 refresh changelog to dataset card

README.md

@@ -99,3 +99,36 @@ Database build code: MIT. Underlying data: public domain (U.S. government record
 ## GitHub
 
 Full source code, build instructions, and example queries: [github.com/ian-nason/ice-database](https://github.com/ian-nason/ice-database)
+
+
+# Changelog
+
+## 2026-07-06 — Full refresh + data-quality audit
+
+Rebuilt from the Deportation Data Project's 2026 FOIA release (data through
+2026-03-10) and repaired after an independent SQL-verified audit.
+
+**Data changes**
+- New `encounters` table (2,586,515 rows, release_2026 only).
+- Release_2025 fully superseded by release_2026; release_2023 rows inside the
+  2026 window (2022-10-01 onward) deleted to prevent double counting.
+  Detention supersede keys on *stay* book-out, removing 17,970 previously
+  double-counted boundary-spanning segments.
+- 12,097 exact-duplicate encounters rows removed.
+- Totals: 22,030,619 rows across 6 tables (was 17.8M across 5).
+
+**Fixes**
+- Views rewritten: `v_arrest_to_detention` and `v_enforcement_pipeline` now
+  produce one row per arrest, matching the first detention stay / removal on
+  or after the arrest within the same release (the old versions joined on
+  `unique_id` alone, fanning out 3.1x with 20-27% negative durations). New
+  `v_detention_stays` view collapses facility segments to stays.
+- `removals.departure_date` header rename in the 2026 release handled
+  (previously would load as all-NULL).
+
+**Known caveats** (see README for the full list)
+- `unique_id` never links across releases (re-anonymized per FOIA release).
+- Detainers and encounters exist only from Oct 2022; `rca_decisions` ends
+  Sep 2023.
+- `arrests` demographics (citizenship, gender, birth year) exist only in
+  release_2026 rows.