feat(integrations): say where an imported Google Health history ends

The two status routes publish backfillEnded: each data type whose
backfill stopped short of the start of its history, with the instant it
reaches back to and whether the horizon or a walk that stopped moving
ended it. The integration card lists them in place of an import that
would otherwise read as still loading, in all seven locales.

Refs #1220

src/app/api/google-health/status/route.ts

@@ -3,6 +3,7 @@ import { apiHandler, requireAuth } from "@/lib/api-handler";
 import { annotate } from "@/lib/logging/context";
 import { apiSuccess } from "@/lib/api-response";
 import { loadOneConnectionHealth } from "@/lib/integrations/connection-health-load";
+import { googleHealthBackfillEndedList } from "@/lib/google-health/sync-core";
 
 /**
  * Get Google Health connection status for the current user (v1.26.0).
@@ -37,6 +38,7 @@ export const GET = apiHandler(async () => {
       lastSyncedAt: true,
       tokenExpiresAt: true,
       backfillCompletedAt: true,
+      backfillProgress: true,
       needsReauth: true,
       createdAt: true,
       scope: true,
@@ -57,6 +59,7 @@ export const GET = apiHandler(async () => {
     tokenExpired,
     tokenExpiresAt: connection.tokenExpiresAt,
     backfillCompleted: !!connection.backfillCompletedAt,
+    backfillEnded: googleHealthBackfillEndedList(connection.backfillProgress),
     needsReauth: connection.needsReauth,
     scope: connection.scope,
     // The one server-resolved state (ok / limited / degraded /

src/app/api/integrations/status/route.ts

@@ -52,6 +52,10 @@ import { getPolarClientCredentials } from "@/lib/polar/credentials";
 import { getStravaClientCredentials } from "@/lib/strava/credentials";
 import { hasActivityScope } from "@/lib/withings/client";
 import { loadConnectionHealth } from "@/lib/integrations/connection-health-load";
+import {
+  googleHealthBackfillEndedList,
+  type GoogleHealthBackfillEndedEntry,
+} from "@/lib/google-health/sync-core";
 import type { ConnectionHealth } from "@/lib/integrations/connection-health";
 
 export const dynamic = "force-dynamic";
@@ -156,6 +160,7 @@ export const GET = apiHandler(async () => {
         lastSyncedAt: true,
         createdAt: true,
         backfillCompletedAt: true,
+        backfillProgress: true,
         needsReauth: true,
       },
     }),
@@ -384,6 +389,9 @@ export const GET = apiHandler(async () => {
         backfillCompleted: googleHealthConn
           ? !!googleHealthConn.backfillCompletedAt
           : null,
+        backfillEnded: googleHealthConn
+          ? googleHealthBackfillEndedList(googleHealthConn.backfillProgress)
+          : [],
         // v1.27.0 — `needsReauth` is the 7-day Testing-mode refresh expiry (or a
         // user-revoked grant) surfaced from the connection row; the card reads it
         // to raise a distinct "Reconnect" CTA separate from parked/disconnected.
@@ -555,6 +563,7 @@ interface GoogleHealthExtras {
   tokenExpiresAt: string | null;
   tokenExpired: boolean | null;
   backfillCompleted: boolean | null;
+  backfillEnded: GoogleHealthBackfillEndedEntry[];
   needsReauth: boolean;
 }