Carry the Coach's memory through backup and restore

The transcript came back in the previous change; what the Coach keeps
BETWEEN threads did not. A restored account had every word of every
conversation and a Coach that has to be told its own history again — the
register said as much for all three: "a restore makes the account
re-tell its history", "keeps the talk and loses the commitment", "a
restored account silently stops sending them".

Tombstones ride only in a disaster-recovery file. All three soft-delete,
and a deleted fact is hidden from injection while kept for audit — a
distinction only the owning instance can act on. A portable file
carrying them would hand a person rows their own app refuses to show
them, and a restore that resurrected one would put a fact back into the
Coach's mouth that the person had deliberately taken out of it.

Neither reference here is a foreign key. sourceConversationId, on all
three, and relatedPlanId on the reminder are bare id columns, so nothing
in the database refuses a value pointing at nothing. That makes them
more dangerous than a real key rather than less: a dangling reference
costs no error, it just quietly stops meaning anything while the row
goes on looking complete. The restore resolves both against what it
actually wrote, nulls what it cannot resolve, and reports the count.

Nulling rather than dropping is the point. A live reminder must not be
lost because the plan it mentions was tombstoned out of a portable file.
The reminder is still the person's and it still fires; what it loses is
a pointer that was already going nowhere.

Order follows from that: threads, then plans, then reminders. Running
the memory before the transcript would cut every fact loose from the
conversation it came out of and still report success.

Verified by breaking it: making the conversation lookup always return
null fails the round trip on the fact's own source field.

src/app/api/admin/backups/[id]/restore/__tests__/round-trip.test.ts

@@ -297,6 +297,9 @@ function sourceClient() {
     measurementReminder: { findMany: vi.fn().mockResolvedValue([]) },
     measurementReminderEvent: { findMany: vi.fn().mockResolvedValue([]) },
     coachConversation: { findMany: vi.fn().mockResolvedValue([]) },
+    coachFact: { findMany: vi.fn().mockResolvedValue([]) },
+    coachPlan: { findMany: vi.fn().mockResolvedValue([]) },
+    coachReminder: { findMany: vi.fn().mockResolvedValue([]) },
     customMetric: {
       findMany: vi.fn().mockResolvedValue([
         {

src/app/api/admin/backups/[id]/restore/route.ts

@@ -50,7 +50,10 @@ import { restoreIntradayProfileData } from "@/lib/export/intraday-profile-backup
 import { restoreHealthScoreData } from "@/lib/export/health-score-backup";
 import { restoreVisitsData } from "@/lib/export/visits-backup";
 import { restoreVaccinationsData } from "@/lib/export/vaccinations-backup";
-import { restoreCoachData } from "@/lib/export/coach-backup";
+import {
+  restoreCoachData,
+  restoreCoachMemoryData,
+} from "@/lib/export/coach-backup";
 import { restoreRemindersData } from "@/lib/export/reminders-backup";
 import { invalidateUserData } from "@/lib/cache/invalidate";
 
@@ -102,6 +105,9 @@ interface RestoreResponse {
     coachConversations: number;
     coachMessages: number;
     coachConversationDocuments: number;
+    coachFacts: number;
+    coachPlans: number;
+    coachReminders: number;
   };
 }
 
@@ -1433,6 +1439,19 @@ const handler = apiHandler(
             skips,
           );
 
+          // What the Coach keeps between threads. AFTER the transcript,
+          // because all three carry a `sourceConversationId` that is resolved
+          // against the threads the branch above has just written — resolving
+          // earlier would cut every fact loose from the conversation it came
+          // out of and still report success.
+          const coachMemoryCleared = await restoreCoachMemoryData(
+            tx,
+            ownerId,
+            payload,
+            new Set(payload.coachConversations.map((c) => c.id)),
+            skips,
+          );
+
           const cleared = {
             measurements: measurements.count,
             medications: meds.count,
@@ -1470,6 +1489,9 @@ const handler = apiHandler(
             coachConversations: coachCleared.coachConversations,
             coachMessages: coachCleared.coachMessages,
             coachConversationDocuments: coachCleared.coachConversationDocuments,
+            coachFacts: coachMemoryCleared.coachFacts,
+            coachPlans: coachMemoryCleared.coachPlans,
+            coachReminders: coachMemoryCleared.coachReminders,
           };
           return { cleared, skipped: summarizeRestoreSkips(skips) };
         },