diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90ca49212..69e0146c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [1.10.0.2] — 2026-06-03 — Disable the intra-day retention drain
+
+### Fixed
+
+- **Stops the post-deploy restart loop for good.** The intra-day retention drain (a storage optimisation behind the new stress reading) folded older samples into a daily summary, but on real data that summary collided with an existing daily row and the drain failed on every run, which kept the app cycling after a deploy. The drain is now switched off until it is reworked and tested against real data; the nightly pass is skipped, nothing is queued at start-up, and any work already queued completes harmlessly. No user-facing feature is lost — the stress reading simply falls back to its sparse-data behaviour.
+
 ## [1.10.0.1] — 2026-06-03 — Defer the intra-day retention drain past startup
 
 ### Fixed
diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 243d4be12..e5c3c41c7 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.10.0.1
+  version: 1.10.0.2
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.
 
diff --git a/package.json b/package.json
index 44da40e57..419ce0580 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.10.0.1",
+  "version": "1.10.0.2",
   "description": "Self-hosted personal-health-tracking PWA with Withings integration, AI insights, and doctor-report PDF export.",
   "license": "AGPL-3.0-only",
   "homepage": "https://healthlog.dev",
diff --git a/src/lib/jobs/dense-intraday-retention.ts b/src/lib/jobs/dense-intraday-retention.ts
index f39d7a2ca..34a6b58a5 100644
--- a/src/lib/jobs/dense-intraday-retention.ts
+++ b/src/lib/jobs/dense-intraday-retention.ts
@@ -61,6 +61,22 @@ export const DENSE_INTRADAY_RETENTION_CRON = "50 3 * * *";
  */
 export const DENSE_INTRADAY_RETENTION_BOOT_DELAY_SECONDS = 600;
 
+/**
+ * Kill-switch, default OFF. The drain folds out-of-window per-sample rows
+ * into one daily-mean `stats:` row, but its canonical-timestamp upsert
+ * collides with an already-present daily row on the
+ * `(user_id, type, measured_at, source, sleep_stage)` unique constraint
+ * (`P2002`) on real data — a fold-coexistence bug the mocked unit tests
+ * could not surface. Until the fold is reworked + integration-tested
+ * against real rows, the drain is disabled: the boot-discovery enqueues
+ * nothing, the nightly walk is skipped, and the per-user handler no-ops so
+ * any already-queued backlog completes harmlessly instead of erroring.
+ * Re-enable with `DENSE_INTRADAY_RETENTION_ENABLED=true` once fixed. The
+ * Stress proxy degrades gracefully on sparse intra-day data meanwhile.
+ */
+export const DENSE_INTRADAY_RETENTION_ENABLED =
+  process.env.DENSE_INTRADAY_RETENTION_ENABLED === "true";
+
 export interface DenseIntradayRetentionPayload {
   userId: string;
   enqueuedAt: string;
@@ -73,6 +89,11 @@ export interface DenseIntradayRetentionPayload {
 export async function runDenseIntradayRetentionForUser(
   userId: string,
 ): Promise<{ daysConsolidated: number; perSampleRowsSoftDeleted: number }> {
+  // Kill-switch: no-op so any already-queued backlog completes cleanly
+  // (drains the queue) instead of erroring on the P2002 fold collision.
+  if (!DENSE_INTRADAY_RETENTION_ENABLED) {
+    return { daysConsolidated: 0, perSampleRowsSoftDeleted: 0 };
+  }
   const summary = await runDenseIntradayRetention(prisma, {
     userId,
     log: () => {
@@ -114,6 +135,10 @@ export async function enqueueBootTimeDenseIntradayRetention(): Promise<{
   skipped: number;
   error: string | null;
 }> {
+  // Kill-switch: enqueue nothing while the drain is disabled.
+  if (!DENSE_INTRADAY_RETENTION_ENABLED) {
+    return { enqueued: 0, skipped: 0, error: null };
+  }
   const boss = getGlobalBoss();
   if (!boss) {
     return { enqueued: 0, skipped: 0, error: null };
diff --git a/src/lib/jobs/reminder-worker.ts b/src/lib/jobs/reminder-worker.ts
index 86bf7ebb1..45a379751 100644
--- a/src/lib/jobs/reminder-worker.ts
+++ b/src/lib/jobs/reminder-worker.ts
@@ -88,6 +88,7 @@ import {
   DENSE_INTRADAY_RETENTION_CONCURRENCY,
   runDenseIntradayRetentionForUser,
   enqueueBootTimeDenseIntradayRetention,
+  DENSE_INTRADAY_RETENTION_ENABLED,
   type DenseIntradayRetentionPayload,
 } from "@/lib/jobs/dense-intraday-retention";
 import { runDenseIntradayRetention } from "@/lib/measurements/dense-intraday-retention";
@@ -2820,17 +2821,24 @@ export async function startReminderWorker() {
         // accounts that accumulated out-of-window raw rows before this
         // shipped.
         try {
-          const denseSummary = await runDenseIntradayRetention(
-            getWorkerPrisma(),
-            {
-              dryRun: false,
-              log: (line) => workerLog("info", line),
-            },
-          );
-          workerLog(
-            "info",
-            `[dense-intraday-retention] triggeredAt=${job.data.triggeredAt} usersScanned=${denseSummary.totals.usersScanned} daysConsolidated=${denseSummary.totals.daysConsolidated} perSampleRowsSoftDeleted=${denseSummary.totals.perSampleRowsSoftDeleted} dailyRowsUpserted=${denseSummary.totals.dailyRowsUpserted}`,
-          );
+          if (!DENSE_INTRADAY_RETENTION_ENABLED) {
+            workerLog(
+              "info",
+              "[dense-intraday-retention] disabled — skipping the nightly walk (P2002 fold collision; re-enable via DENSE_INTRADAY_RETENTION_ENABLED once reworked)",
+            );
+          } else {
+            const denseSummary = await runDenseIntradayRetention(
+              getWorkerPrisma(),
+              {
+                dryRun: false,
+                log: (line) => workerLog("info", line),
+              },
+            );
+            workerLog(
+              "info",
+              `[dense-intraday-retention] triggeredAt=${job.data.triggeredAt} usersScanned=${denseSummary.totals.usersScanned} daysConsolidated=${denseSummary.totals.daysConsolidated} perSampleRowsSoftDeleted=${denseSummary.totals.perSampleRowsSoftDeleted} dailyRowsUpserted=${denseSummary.totals.dailyRowsUpserted}`,
+            );
+          }
         } catch (err) {
           recordError();
           workerLog(