diff --git a/src/app/api/insights/cards/__tests__/route.test.ts b/src/app/api/insights/cards/__tests__/route.test.ts
index 56d842b15..e4a162f53 100644
--- a/src/app/api/insights/cards/__tests__/route.test.ts
+++ b/src/app/api/insights/cards/__tests__/route.test.ts
@@ -190,15 +190,15 @@ describe("GET /api/insights/cards", () => {
       pulseRows.push({ value: i < 3 ? 300 : 68, measuredAt: at });
     }
 
-    vi.mocked(prisma.measurement.findMany).mockImplementation(
-      (async (args: { where?: { type?: unknown } }) => {
-        // `readDayMeanSeries`'s live-fallback probes a single `type`
-        // equality filter; the manual WEIGHT/BP query below probes an
-        // `{ in: [...] }` list — the two calls are distinguishable by shape.
-        if (args?.where?.type === "PULSE") return pulseRows;
-        return [];
-      }) as never,
-    );
+    vi.mocked(prisma.measurement.findMany).mockImplementation((async (args: {
+      where?: { type?: unknown };
+    }) => {
+      // `readDayMeanSeries`'s live-fallback probes a single `type`
+      // equality filter; the manual WEIGHT/BP query below probes an
+      // `{ in: [...] }` list — the two calls are distinguishable by shape.
+      if (args?.where?.type === "PULSE") return pulseRows;
+      return [];
+    }) as never);
 
     const res = await callGet(makeReq());
     expect(res.status).toBe(200);
@@ -216,13 +216,12 @@ describe("GET /api/insights/cards", () => {
       .mocked(prisma.measurement.findMany)
       .mock.calls.find(
         (call) =>
-          typeof (call[0] as { where?: { type?: { in?: unknown[] } } })
-            ?.where?.type === "object",
+          typeof (call[0] as { where?: { type?: { in?: unknown[] } } })?.where
+            ?.type === "object",
       );
     expect(manualCall).toBeDefined();
-    const typeIn = (
-      manualCall?.[0] as { where: { type: { in: string[] } } }
-    ).where.type.in;
+    const typeIn = (manualCall?.[0] as { where: { type: { in: string[] } } })
+      .where.type.in;
     expect(typeIn).not.toContain("PULSE");
   });
 
diff --git a/src/app/api/medications/[id]/intake/import/__tests__/route.test.ts b/src/app/api/medications/[id]/intake/import/__tests__/route.test.ts
index e5e3a00a2..3154ea718 100644
--- a/src/app/api/medications/[id]/intake/import/__tests__/route.test.ts
+++ b/src/app/api/medications/[id]/intake/import/__tests__/route.test.ts
@@ -3,6 +3,10 @@
  * /api/medications/[id]/intake/import. Preserves the
  * `medication.intake.import.invalid_format` errorCode meta so the CSV
  * import client UI can branch on the prefix semantics.
+ *
+ * v1.29 perf fix — the per-row `findUnique` duplicate probe was replaced by
+ * one indexed `findMany` existence read over every row's idempotencyKey
+ * before the write loop. `create` + `consumeForIntake` stay per-row.
  */
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { NextRequest } from "next/server";
@@ -13,7 +17,7 @@ vi.mock("@/lib/db", () => ({
       findUnique: vi.fn(),
     },
     medicationIntakeEvent: {
-      findUnique: vi.fn(),
+      findMany: vi.fn(),
       create: vi.fn(),
     },
     auditLog: { create: vi.fn() },
@@ -75,6 +79,12 @@ function postReq(body: unknown): NextRequest {
 
 const ROUTE_CTX = { params: Promise.resolve({ id: "m1" }) };
 
+/** Mirrors the route's own dedup-key derivation for a zaehler-less row. */
+function keyFor(medId: string, datum: string, uhrzeit: string): string {
+  const takenAt = new Date(`${datum}T${uhrzeit}`);
+  return `import-${medId}-${takenAt.getTime()}`;
+}
+
 beforeEach(() => {
   vi.resetAllMocks();
   vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
@@ -172,10 +182,9 @@ describe("POST /api/medications/[id]/intake/import — 422 multi-issue (v1.4.43
 
 describe("POST /api/medications/[id]/intake/import — inventory consumption", () => {
   beforeEach(() => {
-    // Fresh imports: no pre-existing dedup row, and create echoes an id.
-    vi.mocked(prisma.medicationIntakeEvent.findUnique).mockResolvedValue(
-      null as never,
-    );
+    // Fresh imports: the batched existence read finds no prior rows, and
+    // create echoes an id.
+    vi.mocked(prisma.medicationIntakeEvent.findMany).mockResolvedValue([]);
     let n = 0;
     vi.mocked(prisma.medicationIntakeEvent.create).mockImplementation(
       (async () => ({ id: `evt-${++n}`, takenAt: new Date() })) as never,
@@ -200,16 +209,24 @@ describe("POST /api/medications/[id]/intake/import — inventory consumption", (
     expect(call?.userId).toBe("user-1");
     expect(call?.eventId).toBe("evt-1");
 
+    // The three-row import reads existence in ONE indexed query, not one
+    // findUnique probe per row.
+    expect(prisma.medicationIntakeEvent.findMany).toHaveBeenCalledTimes(1);
+    const findManyArg = vi.mocked(prisma.medicationIntakeEvent.findMany).mock
+      .calls[0]?.[0] as { where: { idempotencyKey: { in: string[] } } };
+    expect(findManyArg.where.idempotencyKey.in).toHaveLength(3);
+
     // (#22) — the whole import queues exactly ONE cross-device sync
     // fan-out, not one per imported row.
     expect(queueMedicationIntakeSync).toHaveBeenCalledTimes(1);
   });
 
   it("does not consume for duplicate (already-imported) rows", async () => {
-    // First entry is a duplicate (existing dedup row), second is fresh.
-    vi.mocked(prisma.medicationIntakeEvent.findUnique)
-      .mockResolvedValueOnce({ id: "existing" } as never)
-      .mockResolvedValueOnce(null as never);
+    // First entry's key is already present — the batched existence read
+    // reports it, the second entry's key is absent (fresh).
+    vi.mocked(prisma.medicationIntakeEvent.findMany).mockResolvedValue([
+      { idempotencyKey: keyFor("m1", "2026-01-01", "07:00:00") },
+    ] as never);
     const res = await POST(
       postReq([
         { datum: "2026-01-01", uhrzeit: "07:00:00" },
diff --git a/src/app/api/medications/[id]/intake/import/route.ts b/src/app/api/medications/[id]/intake/import/route.ts
index 75fa97360..6059f98ff 100644
--- a/src/app/api/medications/[id]/intake/import/route.ts
+++ b/src/app/api/medications/[id]/intake/import/route.ts
@@ -99,6 +99,20 @@ export const POST = apiHandler(
     // so the rollup pass fires once per day rather than once per row.
     const touchedDays = new Set<string>();
 
+    // Perf — a CSV import can carry up to 1000 rows; the pre-fix loop ran a
+    // `findUnique` duplicate probe before every single `create`, up to 2000
+    // sequential round trips. Resolve `takenAt` + the dedup key for every
+    // row first, then read every key's existence in ONE indexed query
+    // (`idempotencyKey` carries its own unique index) before the write
+    // loop. `create` + `consumeForIntake` (inventory decrement) stay
+    // per-row — each has a real side effect keyed off the freshly-created
+    // event's id, so they aren't safely batchable without a deeper change
+    // to the inventory-consumption path.
+    interface PreparedIntake {
+      takenAt: Date;
+      idempotencyKey: string;
+    }
+    const prepared: PreparedIntake[] = [];
     for (const entry of entries) {
       // Parse as local datetime first; if invalid, fall back to CET offset.
       let takenAt = new Date(`${entry.datum}T${entry.uhrzeit}`);
@@ -115,10 +129,26 @@ export const POST = apiHandler(
         ? `import-${id}-${String(entry.zaehler)}`
         : `import-${id}-${takenAt.getTime()}`;
 
-      const existing = await prisma.medicationIntakeEvent.findUnique({
-        where: { idempotencyKey },
-      });
-      if (existing) {
+      prepared.push({ takenAt, idempotencyKey });
+    }
+
+    const existingRows =
+      prepared.length > 0
+        ? await prisma.medicationIntakeEvent.findMany({
+            where: {
+              idempotencyKey: { in: prepared.map((p) => p.idempotencyKey) },
+            },
+            select: { idempotencyKey: true },
+          })
+        : [];
+    const existingKeys = new Set(
+      existingRows
+        .map((r) => r.idempotencyKey)
+        .filter((k): k is string => k !== null),
+    );
+
+    for (const { takenAt, idempotencyKey } of prepared) {
+      if (existingKeys.has(idempotencyKey)) {
         skippedDuplicates++;
         continue;
       }
diff --git a/src/app/api/mood-entries/bulk/__tests__/route.test.ts b/src/app/api/mood-entries/bulk/__tests__/route.test.ts
index 7bf24ea65..00a815a76 100644
--- a/src/app/api/mood-entries/bulk/__tests__/route.test.ts
+++ b/src/app/api/mood-entries/bulk/__tests__/route.test.ts
@@ -321,7 +321,8 @@ describe("POST /api/mood-entries/bulk — structured tagKeys (v1.12.0)", () => {
     };
     expect(json.data.inserted).toBe(1);
     expect(prisma.moodEntry.findMany).toHaveBeenCalledTimes(1);
-    const findManyArg = vi.mocked(prisma.moodEntry.findMany).mock.calls[0]?.[0] as {
+    const findManyArg = vi.mocked(prisma.moodEntry.findMany).mock
+      .calls[0]?.[0] as {
       where: { userId: string; OR: Array<Record<string, unknown>> };
     };
     expect(findManyArg.where.OR).toContainEqual({
@@ -349,7 +350,8 @@ describe("POST /api/mood-entries/bulk — structured tagKeys (v1.12.0)", () => {
     const json = (await res.json()) as {
       data: { entries: Array<{ externalId?: string }> };
     };
-    const findManyArg = vi.mocked(prisma.moodEntry.findMany).mock.calls[0]?.[0] as {
+    const findManyArg = vi.mocked(prisma.moodEntry.findMany).mock
+      .calls[0]?.[0] as {
       where: { OR: Array<Record<string, unknown>> };
     };
     expect(findManyArg.where.OR).toContainEqual({
diff --git a/src/app/api/mood-entries/bulk/route.ts b/src/app/api/mood-entries/bulk/route.ts
index c74dc1d9a..95fde2461 100644
--- a/src/app/api/mood-entries/bulk/route.ts
+++ b/src/app/api/mood-entries/bulk/route.ts
@@ -209,7 +209,10 @@ async function postBulk(request: NextRequest): Promise<Response> {
   > = entries.map((entry) =>
     entry.externalId
       ? { source: entry.source, externalId: entry.externalId }
-      : { date: moodDateKey(entry.moodLoggedAt, tz), moodLoggedAt: entry.moodLoggedAt },
+      : {
+          date: moodDateKey(entry.moodLoggedAt, tz),
+          moodLoggedAt: entry.moodLoggedAt,
+        },
   );
   const existingRows =
     orClauses.length > 0
@@ -231,7 +234,10 @@ async function postBulk(request: NextRequest): Promise<Response> {
     if (row.externalId !== null) {
       existingByExternalKey.set(`${row.source}::${row.externalId}`, row);
     }
-    existingByDateKey.set(`${row.date}::${row.moodLoggedAt.toISOString()}`, row);
+    existingByDateKey.set(
+      `${row.date}::${row.moodLoggedAt.toISOString()}`,
+      row,
+    );
   }
 
   for (let i = 0; i < entries.length; i++) {
@@ -271,8 +277,9 @@ async function postBulk(request: NextRequest): Promise<Response> {
       const existing =
         (entry.externalId
           ? existingByExternalKey.get(`${resolvedSource}::${entry.externalId}`)
-          : existingByDateKey.get(`${date}::${entry.moodLoggedAt.toISOString()}`)) ??
-        null;
+          : existingByDateKey.get(
+              `${date}::${entry.moodLoggedAt.toISOString()}`,
+            )) ?? null;
 
       // Tombstone suppression: a soft-deleted match stays deleted. The
       // user-facing DELETE route flips `deletedAt` so the `/api/sync/changes`
diff --git a/src/app/api/nutrients/batch/__tests__/route.test.ts b/src/app/api/nutrients/batch/__tests__/route.test.ts
index 1d53a6597..1faac5028 100644
--- a/src/app/api/nutrients/batch/__tests__/route.test.ts
+++ b/src/app/api/nutrients/batch/__tests__/route.test.ts
@@ -113,9 +113,8 @@ beforeEach(() => {
   vi.mocked(prisma.nutrientIntakeDay.update).mockResolvedValue({} as never);
   // Real Prisma resolves every promise in the `$transaction([...])` array;
   // the mock does the same so the update path actually runs in these tests.
-  vi.mocked(prisma.$transaction).mockImplementation(
-    (async (ops: unknown[]) => Promise.all(ops)) as never,
-  );
+  vi.mocked(prisma.$transaction).mockImplementation((async (ops: unknown[]) =>
+    Promise.all(ops)) as never);
 });
 
 describe("POST /api/nutrients/batch — module gate", () => {
diff --git a/src/lib/daily/__tests__/load-digest.test.ts b/src/lib/daily/__tests__/load-digest.test.ts
index 8a6dae2b9..5e775572c 100644
--- a/src/lib/daily/__tests__/load-digest.test.ts
+++ b/src/lib/daily/__tests__/load-digest.test.ts
@@ -35,9 +35,7 @@ vi.mock("@/lib/rollups/measurement-coverage", () => ({
 }));
 
 vi.mock("@/lib/insights/derived/baseline", () => ({
-  readDayMeanSeries: vi
-    .fn()
-    .mockResolvedValue({ points: [], source: "none" }),
+  readDayMeanSeries: vi.fn().mockResolvedValue({ points: [], source: "none" }),
 }));
 
 vi.mock("@/lib/analytics/intraday-pulse-io", () => ({