diff --git a/docs/handover.md b/docs/handover.md
index 664d8f2..753f511 100644
--- a/docs/handover.md
+++ b/docs/handover.md
@@ -142,13 +142,24 @@ established, because it is more than "the agents work":
 Re-run it after any change to the loop, retrieval, or prompt assembly. It is
 the only check that measures answers rather than boundaries.
 
-**The seeded activity data is NOT anchored to today.** `ShiftRecord` is —
-`seed.js` says so — and `UserActivity` is not, so it ages out of every window
-the activity tools offer. As of 2026-08-29 the newest event was 23 days old:
-zero events in the last 7 days and 6 of 15 in the last 30. The activity agent
-answers truthfully and the demo looks dead. Anchoring it the way shifts are
-anchored is the fix; it changes `seed.json`, so it goes through
-`npm run seed:fixture` and re-runs the frontend checks.
+**Seeded time-series data is rebased to now at seed time** — see
+`seeder.RebaseToNow`. `ShiftRecord` is generated against now; `UserActivity`,
+`JobApplication`, `AIInterview` and `Staff` are moved so their newest record
+sits at today, keeping every authored gap. Without it the demo goes quiet: on
+2026-08-29 the newest activity event was 23 days old, applications 16 days,
+staff hire dates 35 — zero events in the last 7 days and an empty Hiring
+activity chart on Control Center.
+
+Two things to know if you touch it. EVERY timestamp on a record shifts by the
+same delta, not just the anchor: an application's created_date and updated_date
+are what `buildHires` subtracts for time-to-hire, and moving one alone turns a
+five-day hire into a three-week one. And `Staff` anchors on `hire_date` rather
+than `created_date`, because the hire is the event the chart plots — leaving it
+behind produced a workspace where somebody was hired last week according to
+their application and five weeks ago according to their staff record.
+
+Reference data is deliberately not rebased. A course's date is a fact about the
+course, not a position in a window.
 
 ---
 
diff --git a/go-api/internal/seeder/seeder.go b/go-api/internal/seeder/seeder.go
index 51ce658..4b52b87 100644
--- a/go-api/internal/seeder/seeder.go
+++ b/go-api/internal/seeder/seeder.go
@@ -138,6 +138,11 @@ var rebasedEntities = map[string]string{
 	"UserActivity":   "created_date",
 	"JobApplication": "created_date",
 	"AIInterview":    "created_date",
+	// Anchored on hire_date, not created_date: the hire is the event the
+	// Hiring activity chart plots, and leaving it behind while applications
+	// moved produced a workspace where somebody was hired last week according
+	// to their application and five weeks ago according to their staff record.
+	"Staff": "hire_date",
 }
 
 // New builds a seeder. `now` anchors the generated shift records.