fix: preserve legacy compliance response contract

src/app/api/medications/[id]/compliance/__tests__/route.test.ts

@@ -175,8 +175,22 @@ describe("GET /api/medications/[id]/compliance - applicability", () => {
     expect(data).toEqual({
       applicable: false,
       notApplicableReason: "NO_LOCAL_SCHEDULE",
-      compliance7: null,
-      compliance30: null,
+      compliance7: {
+        totalExpected: 0,
+        taken: 0,
+        skipped: 0,
+        missed: 0,
+        rate: 0,
+        streak: 0,
+      },
+      compliance30: {
+        totalExpected: 0,
+        taken: 0,
+        skipped: 0,
+        missed: 0,
+        rate: 0,
+        streak: 0,
+      },
       dailyCompliance: {},
       complianceDisplay: null,
     });

src/app/api/medications/compliance/__tests__/route.test.ts

@@ -59,6 +59,15 @@ import { checkRateLimit } from "@/lib/rate-limit";
 
 const TZ = "UTC";
 
+const LEGACY_EMPTY_COMPLIANCE = {
+  totalExpected: 0,
+  taken: 0,
+  skipped: 0,
+  missed: 0,
+  rate: 0,
+  streak: 0,
+};
+
 const SESSION_OK = {
   session: { id: "sess-1", expiresAt: new Date(Date.now() + 3_600_000) },
   user: {
@@ -165,14 +174,46 @@ describe("GET /api/medications/compliance", () => {
         medicationId: "mirror-1",
         applicable: false,
         notApplicableReason: "NO_LOCAL_SCHEDULE",
-        compliance7: null,
-        compliance30: null,
+        compliance7: LEGACY_EMPTY_COMPLIANCE,
+        compliance30: LEGACY_EMPTY_COMPLIANCE,
         complianceDisplay: null,
       },
     ]);
     expect(prisma.medicationIntakeEvent.findMany).not.toHaveBeenCalled();
   });
 
+  it("keeps a mixed scheduled/mirror batch decodable by the legacy non-null contract", async () => {
+    vi.mocked(prisma.medication.findMany).mockResolvedValue([
+      medication("med-1"),
+      {
+        ...medication("mirror-1"),
+        externalSource: "APPLE_HEALTH",
+        externalId: "hk-concept-1",
+        schedules: [],
+      },
+    ] as never);
+
+    const res = await (GET as (req: Request) => Promise<Response>)(
+      new Request("http://localhost"),
+    );
+    expect(res.status).toBe(200);
+    const body = await res.json();
+    const items = body.data as Array<Record<string, unknown>>;
+
+    expect(items).toHaveLength(2);
+    expect(items[0]?.applicable).toBe(true);
+    expect(items[0]?.compliance7).toBeTruthy();
+    expect(items[0]?.compliance30).toBeTruthy();
+    expect(items[1]).toMatchObject({
+      medicationId: "mirror-1",
+      applicable: false,
+      notApplicableReason: "NO_LOCAL_SCHEDULE",
+      compliance7: LEGACY_EMPTY_COMPLIANCE,
+      compliance30: LEGACY_EMPTY_COMPLIANCE,
+      complianceDisplay: null,
+    });
+  });
+
   it("reads each medication through the shared per-medication cache cell", async () => {
     vi.mocked(prisma.medication.findMany).mockResolvedValue([
       medication("med-1"),

src/components/medications/detail/medication-detail-tabs.tsx

@@ -382,8 +382,8 @@ export function MedicationDetailTabs({
         return await apiGet<{
           applicable: boolean;
           notApplicableReason: "NO_LOCAL_SCHEDULE" | null;
-          compliance7: { rate: number; streak: number } | null;
-          compliance30: { rate: number } | null;
+          compliance7: { rate: number; streak: number };
+          compliance30: { rate: number };
           complianceDisplay: ComplianceDisplay | null;
         }>(`/api/medications/${id}/compliance`);
       } catch {

src/lib/medications/compliance-payload.ts

@@ -41,12 +41,31 @@ export interface CompliancePayload {
    */
   applicable: boolean;
   notApplicableReason: "NO_LOCAL_SCHEDULE" | null;
-  compliance7: ComplianceResult | null;
-  compliance30: ComplianceResult | null;
+  compliance7: ComplianceResult;
+  compliance30: ComplianceResult;
   dailyCompliance: Record<string, DailyComplianceEntry>;
   complianceDisplay: ComplianceDisplay | null;
 }
 
+/**
+ * Legacy-compatible placeholder for a medication whose adherence percentage
+ * is explicitly not applicable.
+ *
+ * Released iOS 1.0.3 requires `compliance7` and `compliance30` to decode as
+ * non-null `ComplianceWindowResult` objects. Keep those fields structurally
+ * present while `applicable=false` remains the authoritative semantic signal
+ * for clients that understand the newer contract. All-zero values avoid
+ * reviving the old vacuous 100% result.
+ */
+const NOT_APPLICABLE_LEGACY_COMPLIANCE: ComplianceResult = {
+  totalExpected: 0,
+  taken: 0,
+  skipped: 0,
+  missed: 0,
+  rate: 0,
+  streak: 0,
+};
+
 /** The medication slice the payload builder consumes. */
 export interface ComplianceMedicationInput {
   id: string;
@@ -155,8 +174,8 @@ export async function buildCompliancePayload(
     return {
       applicable: false,
       notApplicableReason: "NO_LOCAL_SCHEDULE",
-      compliance7: null,
-      compliance30: null,
+      compliance7: NOT_APPLICABLE_LEGACY_COMPLIANCE,
+      compliance30: NOT_APPLICABLE_LEGACY_COMPLIANCE,
       dailyCompliance: {},
       complianceDisplay: null,
     };

src/lib/openapi/routes/medications/paths.ts

@@ -1413,7 +1413,7 @@ export const medicationPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       tags: ["Medications"],
       summary: "Batched adherence read for every medication of the caller",
       description:
-        "Returns one compact row per non-PRN medication. A scheduled medication with no local schedule remains in the array with applicable=false, reason NO_LOCAL_SCHEDULE, and null percentage/display fields so card and table clients do not mistake it for 100 percent or leave it loading.",
+        "Returns one compact row per non-PRN medication. A scheduled medication with no local schedule remains in the array with applicable=false and reason NO_LOCAL_SCHEDULE. compliance7/compliance30 stay non-null as all-zero compatibility placeholders for released clients; aware clients must ignore those percentages when applicable=false. complianceDisplay is null.",
       responses: {
         ...recordRefusal(),
         "200": {
@@ -1436,7 +1436,7 @@ export const medicationPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       tags: ["Medications"],
       summary: "Adherence read for a medication",
       description:
-        "Returns the cadence-aware adherence payload. A scheduled medication with no local schedule returns applicable=false, reason NO_LOCAL_SCHEDULE, null percentage/display fields, and an empty daily grid. Medications with a local schedule preserve the existing arithmetic, including windows in which no dose is due.",
+        "Returns the cadence-aware adherence payload. A scheduled medication with no local schedule returns applicable=false, reason NO_LOCAL_SCHEDULE, non-null all-zero compliance7/compliance30 compatibility placeholders, a null display block, and an empty daily grid. Aware clients must not render the placeholder percentages. Medications with a local schedule preserve the existing arithmetic, including windows in which no dose is due.",
       requestParams: {
         path: z.object({ id: z.string() }),
       },

src/lib/openapi/routes/medications/schemas.ts

@@ -766,16 +766,12 @@ export const medicationComplianceResponse = z
       .describe(
         "Reason adherence is not applicable. NO_LOCAL_SCHEDULE means the medication has no HealthLog-owned expected-dose grid.",
       ),
-    compliance7: complianceResult
-      .nullable()
-      .describe(
-        "Seven-day adherence summary, or null when applicable is false.",
-      ),
-    compliance30: complianceResult
-      .nullable()
-      .describe(
-        "Thirty-day adherence summary, or null when applicable is false.",
-      ),
+    compliance7: complianceResult.describe(
+      "Seven-day adherence summary. When applicable is false, this remains a non-null all-zero compatibility placeholder for released clients and must not be rendered as a percentage.",
+    ),
+    compliance30: complianceResult.describe(
+      "Thirty-day adherence summary. When applicable is false, this remains a non-null all-zero compatibility placeholder for released clients and must not be rendered as a percentage.",
+    ),
     dailyCompliance: z
       .record(z.string(), dailyComplianceEntry)
       .describe(
@@ -802,8 +798,12 @@ export const medicationComplianceSummaryEntry = z
         "Whether this medication has a local expected-dose grid and therefore a displayable adherence percentage.",
       ),
     notApplicableReason: z.literal("NO_LOCAL_SCHEDULE").nullable(),
-    compliance7: complianceResult.nullable(),
-    compliance30: complianceResult.nullable(),
+    compliance7: complianceResult.describe(
+      "Seven-day adherence summary, or an all-zero compatibility placeholder when applicable is false.",
+    ),
+    compliance30: complianceResult.describe(
+      "Thirty-day adherence summary, or an all-zero compatibility placeholder when applicable is false.",
+    ),
     complianceDisplay: complianceDisplay.nullable(),
   })
   .meta({

src/lib/queries/use-medication-compliance-summary.ts

@@ -17,8 +17,8 @@ export interface MedicationComplianceSummaryEntry {
   medicationId: string;
   applicable: boolean;
   notApplicableReason: "NO_LOCAL_SCHEDULE" | null;
-  compliance7: { rate: number; streak: number } | null;
-  compliance30: { rate: number } | null;
+  compliance7: { rate: number; streak: number };
+  compliance30: { rate: number };
   complianceDisplay: ComplianceDisplay | null;
 }