diff --git a/npm/packages/rvf/dist/backend.d.ts b/npm/packages/rvf/dist/backend.d.ts
index c984eb52f..30bd08d38 100644
--- a/npm/packages/rvf/dist/backend.d.ts
+++ b/npm/packages/rvf/dist/backend.d.ts
@@ -79,9 +79,27 @@ export declare class NodeBackend implements RvfBackend {
     private resolveLabel;
     /** Path to the sidecar mappings file. */
     private mappingsPath;
-    /** Persist the string↔label mapping to a sidecar JSON file. */
+    /**
+     * Persist the string↔label mapping to a sidecar JSON file.
+     *
+     * `delete()` resolves string ids through this map and silently filters out
+     * anything unresolvable, so a lost or torn write turns every ingest since
+     * the last good save into an undeletable-by-id vector. Persistence is
+     * therefore NOT best-effort: the write is made atomic (temp file + rename,
+     * so a crash/ENOSPC mid-write can never leave partial JSON at `mp`) and a
+     * failure is surfaced rather than swallowed.
+     */
     private saveMappings;
-    /** Load the string↔label mapping from the sidecar JSON file if it exists. */
+    /**
+     * Load the string↔label mapping from the sidecar JSON file if it exists.
+     *
+     * A corrupt sidecar must NOT degrade to empty maps: `nextLabel` would reset
+     * to 1 and subsequent ingests would assign labels colliding with existing
+     * vectors (silent data corruption), and the next `saveMappings()` would
+     * overwrite the recoverable file. Instead the corrupt sidecar is quarantined
+     * (renamed aside so it is not clobbered) and a `SidecarCorrupt` error is
+     * raised so the caller learns string-id operations are unsafe.
+     */
     private loadMappings;
 }
 /**
diff --git a/npm/packages/rvf/dist/backend.js b/npm/packages/rvf/dist/backend.js
index b74e36b63..f0e64437a 100644
--- a/npm/packages/rvf/dist/backend.js
+++ b/npm/packages/rvf/dist/backend.js
@@ -15,23 +15,13 @@ var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (
 }) : function(o, v) {
     o["default"] = v;
 });
-var __importStar = (this && this.__importStar) || (function () {
-    var ownKeys = function(o) {
-        ownKeys = Object.getOwnPropertyNames || function (o) {
-            var ar = [];
-            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
-            return ar;
-        };
-        return ownKeys(o);
-    };
-    return function (mod) {
-        if (mod && mod.__esModule) return mod;
-        var result = {};
-        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
-        __setModuleDefault(result, mod);
-        return result;
-    };
-})();
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.WasmBackend = exports.NodeBackend = void 0;
 exports.resolveBackend = resolveBackend;
@@ -377,41 +367,77 @@ class NodeBackend {
     mappingsPath() {
         return this.storePath ? this.storePath + '.idmap.json' : '';
     }
-    /** Persist the string↔label mapping to a sidecar JSON file. */
+    /**
+     * Persist the string↔label mapping to a sidecar JSON file.
+     *
+     * `delete()` resolves string ids through this map and silently filters out
+     * anything unresolvable, so a lost or torn write turns every ingest since
+     * the last good save into an undeletable-by-id vector. Persistence is
+     * therefore NOT best-effort: the write is made atomic (temp file + rename,
+     * so a crash/ENOSPC mid-write can never leave partial JSON at `mp`) and a
+     * failure is surfaced rather than swallowed.
+     */
     async saveMappings() {
         const mp = this.mappingsPath();
         if (!mp)
             return;
+        const fs = await Promise.resolve().then(() => __importStar(require('fs')));
+        const data = JSON.stringify({
+            idToLabel: Object.fromEntries(this.idToLabel),
+            labelToId: Object.fromEntries(Array.from(this.labelToId.entries()).map(([k, v]) => [String(k), v])),
+            nextLabel: this.nextLabel,
+        });
+        const tmp = `${mp}.tmp`;
         try {
-            const fs = await Promise.resolve().then(() => __importStar(require('fs')));
-            const data = JSON.stringify({
-                idToLabel: Object.fromEntries(this.idToLabel),
-                labelToId: Object.fromEntries(Array.from(this.labelToId.entries()).map(([k, v]) => [String(k), v])),
-                nextLabel: this.nextLabel,
-            });
-            fs.writeFileSync(mp, data, 'utf-8');
+            fs.writeFileSync(tmp, data, 'utf-8');
+            fs.renameSync(tmp, mp);
         }
-        catch {
-            // Non-fatal: mapping persistence is best-effort (e.g. read-only FS).
+        catch (err) {
+            try {
+                fs.rmSync(tmp, { force: true });
+            }
+            catch {
+                // best-effort cleanup of the temp file
+            }
+            throw new errors_1.RvfError(errors_1.RvfErrorCode.SidecarWriteFailed, `at ${mp}: ${err instanceof Error ? err.message : String(err)}`);
         }
     }
-    /** Load the string↔label mapping from the sidecar JSON file if it exists. */
+    /**
+     * Load the string↔label mapping from the sidecar JSON file if it exists.
+     *
+     * A corrupt sidecar must NOT degrade to empty maps: `nextLabel` would reset
+     * to 1 and subsequent ingests would assign labels colliding with existing
+     * vectors (silent data corruption), and the next `saveMappings()` would
+     * overwrite the recoverable file. Instead the corrupt sidecar is quarantined
+     * (renamed aside so it is not clobbered) and a `SidecarCorrupt` error is
+     * raised so the caller learns string-id operations are unsafe.
+     */
     async loadMappings() {
         const mp = this.mappingsPath();
         if (!mp)
             return;
+        const fs = await Promise.resolve().then(() => __importStar(require('fs')));
+        if (!fs.existsSync(mp))
+            return; // fresh store: no sidecar yet is legitimate
+        let parsed;
         try {
-            const fs = await Promise.resolve().then(() => __importStar(require('fs')));
-            if (!fs.existsSync(mp))
-                return;
-            const raw = JSON.parse(fs.readFileSync(mp, 'utf-8'));
-            this.idToLabel = new Map(Object.entries(raw.idToLabel ?? {}).map(([k, v]) => [k, Number(v)]));
-            this.labelToId = new Map(Object.entries(raw.labelToId ?? {}).map(([k, v]) => [Number(k), v]));
-            this.nextLabel = raw.nextLabel ?? this.idToLabel.size + 1;
+            parsed = JSON.parse(fs.readFileSync(mp, 'utf-8'));
         }
-        catch {
-            // Non-fatal: start with empty mappings.
+        catch (err) {
+            const quarantine = `${mp}.corrupt-${Date.now()}`;
+            try {
+                fs.renameSync(mp, quarantine);
+            }
+            catch {
+                // if we cannot move it aside, leave it in place — still fail loud
+            }
+            throw new errors_1.RvfError(errors_1.RvfErrorCode.SidecarCorrupt, `at ${mp} (quarantined to ${quarantine}): string-id delete()/ingest would ` +
+                `silently corrupt data — restore a valid sidecar or recreate the store; ` +
+                `${err instanceof Error ? err.message : String(err)}`);
         }
+        this.idToLabel = new Map(Object.entries(parsed.idToLabel ?? {}).map(([k, v]) => [k, Number(v)]));
+        this.labelToId = new Map(Object.entries(parsed.labelToId ?? {}).map(([k, v]) => [Number(k), v]));
+        this.nextLabel = parsed.nextLabel ?? this.idToLabel.size + 1;
     }
 }
 exports.NodeBackend = NodeBackend;
diff --git a/npm/packages/rvf/dist/backend.js.map b/npm/packages/rvf/dist/backend.js.map
index e4e0848ae..8c03416db 100644
--- a/npm/packages/rvf/dist/backend.js.map
+++ b/npm/packages/rvf/dist/backend.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/npm/packages/rvf/dist/errors.d.ts b/npm/packages/rvf/dist/errors.d.ts
index 780120627..3b9f0b252 100644
--- a/npm/packages/rvf/dist/errors.d.ts
+++ b/npm/packages/rvf/dist/errors.d.ts
@@ -39,7 +39,9 @@ export declare enum RvfErrorCode {
     BackendNotFound = 65280,
     BackendInitFailed = 65281,
     StoreClosed = 65282,
-    InvalidOptions = 65283
+    InvalidOptions = 65283,
+    SidecarWriteFailed = 65286,
+    SidecarCorrupt = 65287
 }
 /**
  * Custom error class for all RVF operations.
diff --git a/npm/packages/rvf/dist/errors.js b/npm/packages/rvf/dist/errors.js
index a9ec959dc..b23345f81 100644
--- a/npm/packages/rvf/dist/errors.js
+++ b/npm/packages/rvf/dist/errors.js
@@ -51,6 +51,9 @@ var RvfErrorCode;
     RvfErrorCode[RvfErrorCode["BackendInitFailed"] = 65281] = "BackendInitFailed";
     RvfErrorCode[RvfErrorCode["StoreClosed"] = 65282] = "StoreClosed";
     RvfErrorCode[RvfErrorCode["InvalidOptions"] = 65283] = "InvalidOptions";
+    // (0xff04–0xff05 reserved)
+    RvfErrorCode[RvfErrorCode["SidecarWriteFailed"] = 65286] = "SidecarWriteFailed";
+    RvfErrorCode[RvfErrorCode["SidecarCorrupt"] = 65287] = "SidecarCorrupt";
 })(RvfErrorCode || (exports.RvfErrorCode = RvfErrorCode = {}));
 /** Human-readable labels for each error code. */
 const ERROR_MESSAGES = {
@@ -90,6 +93,8 @@ const ERROR_MESSAGES = {
     [RvfErrorCode.BackendInitFailed]: 'Backend initialization failed',
     [RvfErrorCode.StoreClosed]: 'Store has been closed',
     [RvfErrorCode.InvalidOptions]: 'Invalid store creation options',
+    [RvfErrorCode.SidecarWriteFailed]: 'Failed to persist the string-id map sidecar',
+    [RvfErrorCode.SidecarCorrupt]: 'The string-id map sidecar is missing fields or corrupt',
 };
 /**
  * Custom error class for all RVF operations.
diff --git a/npm/packages/rvf/dist/errors.js.map b/npm/packages/rvf/dist/errors.js.map
index 201a75f8e..5e5a26fb8 100644
--- a/npm/packages/rvf/dist/errors.js.map
+++ b/npm/packages/rvf/dist/errors.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"errors.js","sourceRoot":"","sources":["../src/errors.ts"],"names":[],"mappings":";;;AAAA;;;;GAIG;AACH,IAAY,YAqDX;AArDD,WAAY,YAAY;IACtB,yBAAyB;IACzB,2CAAW,CAAA;IACX,yDAAkB,CAAA;IAElB,+BAA+B;IAC/B,iEAAqB,CAAA;IACrB,qEAAuB,CAAA;IACvB,uEAAwB,CAAA;IACxB,yEAAyB,CAAA;IACzB,yEAAyB,CAAA;IACzB,uEAAwB,CAAA;IACxB,yEAAyB,CAAA;IACzB,6EAA2B,CAAA;IAC3B,qEAAuB,CAAA;IAEvB,8BAA8B;IAC9B,2EAA0B,CAAA;IAC1B,6DAAmB,CAAA;IACnB,2EAA0B,CAAA;IAC1B,yEAAyB,CAAA;IACzB,2DAAkB,CAAA;IAClB,uDAAgB,CAAA;IAEhB,8BAA8B;IAC9B,yDAAiB,CAAA;IACjB,2DAAkB,CAAA;IAClB,yDAAiB,CAAA;IACjB,+DAAoB,CAAA;IACpB,uEAAwB,CAAA;IACxB,yDAAiB,CAAA;IAEjB,gDAAgD;IAChD,0DAAiB,CAAA;IACjB,wDAAgB,CAAA;IAChB,gEAAoB,CAAA;IACpB,sEAAuB,CAAA;IACvB,4EAA0B,CAAA;IAE1B,+BAA+B;IAC/B,gEAAoB,CAAA;IACpB,8DAAmB,CAAA;IACnB,oEAAsB,CAAA;IACtB,wEAAwB,CAAA;IAExB,4BAA4B;IAC5B,yEAAwB,CAAA;IACxB,6EAA0B,CAAA;IAC1B,iEAAoB,CAAA;IACpB,uEAAuB,CAAA;IACvB,2BAA2B;IAC3B,+EAA2B,CAAA;IAC3B,uEAAuB,CAAA;AACzB,CAAC,EArDW,YAAY,4BAAZ,YAAY,QAqDvB;AAED,iDAAiD;AACjD,MAAM,cAAc,GAA2B;IAC7C,CAAC,YAAY,CAAC,EAAE,CAAC,EAAE,qBAAqB;IACxC,CAAC,YAAY,CAAC,SAAS,CAAC,EAAE,qCAAqC;IAC/D,CAAC,YAAY,CAAC,YAAY,CAAC,EAAE,wBAAwB;IACrD,CAAC,YAAY,CAAC,cAAc,CAAC,EAAE,6BAA6B;IAC5D,CAAC,YAAY,CAAC,eAAe,CAAC,EAAE,kCAAkC;IAClE,CAAC,YAAY,CAAC,gBAAgB,CAAC,EAAE,iCAAiC;IAClE,CAAC,YAAY,CAAC,gBAAgB,CAAC,EAAE,uCAAuC;IACxE,CAAC,YAAY,CAAC,eAAe,CAAC,EAAE,iCAAiC;IACjE,CAAC,YAAY,CAAC,gBAAgB,CAAC,EAAE,2BAA2B;IAC5D,CAAC,YAAY,CAAC,kBAAkB,CAAC,EAAE,2BAA2B;IAC9D,CAAC,YAAY,CAAC,cAAc,CAAC,EAAE,uCAAuC;IACtE,CAAC,YAAY,CAAC,iBAAiB,CAAC,EAAE,2CAA2C;IAC7E,CAAC,YAAY,CAAC,UAAU,CAAC,EAAE,6BAA6B;IACxD,CAAC,YAAY,CAAC,iBAAiB,CAAC,EAAE,yCAAyC;IAC3E,CAAC,YAAY,CAAC,gBAAgB,CAAC,EAAE,2BAA2B;IAC5D,CAAC,YAAY,CAAC,SAAS,CAAC,EAAE,uCAAuC;IACjE,CAAC,YAAY,CAAC,OAAO,CAAC,EAAE,4BAA4B;IACpD,CAAC,YAAY,CAAC,QAAQ,CAAC,EAAE,+BAA+B;IACxD,CAAC,YAAY,CAAC,SAAS,CAAC,EAAE,oCAAoC;IAC9D,CAAC,YAAY,CAAC,QAAQ,CAAC,EAAE,8BAA8B;IACvD,CAAC,YAAY,CAAC,WAAW,CAAC,EAAE,8BAA8B;IAC1D,CAAC,YAAY,CAAC,eAAe,CAAC,EAAE,4BAA4B;IAC5D,CAAC,YAAY,CAAC,QAAQ,CAAC,EAAE,gCAAgC;IACzD,CAAC,YAAY,CAAC,QAAQ,CAAC,EAAE,8CAA8C;IACvE,CAAC,YAAY,CAAC,OAAO,CAAC,EAAE,8BAA8B;IACtD,CAAC,YAAY,CAAC,WAAW,CAAC,EAAE,uCAAuC;IACnE,CAAC,YAAY,CAAC,cAAc,CAAC,EAAE,4BAA4B;IAC3D,CAAC,YAAY,CAAC,iBAAiB,CAAC,EAAE,yCAAyC;IAC3E,CAAC,YAAY,CAAC,WAAW,CAAC,EAAE,6BAA6B;IACzD,CAAC,YAAY,CAAC,UAAU,CAAC,EAAE,gCAAgC;IAC3D,CAAC,YAAY,CAAC,aAAa,CAAC,EAAE,4CAA4C;IAC1E,CAAC,YAAY,CAAC,eAAe,CAAC,EAAE,yCAAyC;IACzE,CAAC,YAAY,CAAC,eAAe,CAAC,EAAE,8EAA8E;IAC9G,CAAC,YAAY,CAAC,iBAAiB,CAAC,EAAE,+BAA+B;IACjE,CAAC,YAAY,CAAC,WAAW,CAAC,EAAE,uBAAuB;IACnD,CAAC,YAAY,CAAC,cAAc,CAAC,EAAE,gCAAgC;IAC/D,CAAC,YAAY,CAAC,kBAAkB,CAAC,EAAE,6CAA6C;IAChF,CAAC,YAAY,CAAC,cAAc,CAAC,EAAE,wDAAwD;CACxF,CAAC;AAEF;;;;;GAKG;AACH,MAAa,QAAS,SAAQ,KAAK;IAIjC,8CAA8C;IAC9C,IAAI,QAAQ;QACV,OAAO,CAAC,IAAI,CAAC,IAAI,IAAI,CAAC,CAAC,GAAG,IAAI,CAAC;IACjC,CAAC;IAED,qEAAqE;IACrE,IAAI,aAAa;QACf,OAAO,IAAI,CAAC,QAAQ,KAAK,IAAI,CAAC;IAChC,CAAC;IAED,YAAY,IAAkB,EAAE,MAAe;QAC7C,MAAM,IAAI,GAAG,cAAc,CAAC,IAAI,CAAC,IAAI,eAAe,IAAI,CAAC,QAAQ,CAAC,EAAE,CAAC,CAAC,QAAQ,CAAC,CAAC,EAAE,GAAG,CAAC,EAAE,CAAC;QACzF,MAAM,OAAO,GAAG,MAAM,CAAC,CAAC,CAAC,GAAG,IAAI,KAAK,MAAM,EAAE,CAAC,CAAC,CAAC,IAAI,CAAC;QACrD,KAAK,CAAC,OAAO,CAAC,CAAC;QACf,IAAI,CAAC,IAAI,GAAG,UAAU,CAAC;QACvB,IAAI,CAAC,IAAI,GAAG,IAAI,CAAC;IACnB,CAAC;IAED;;;OAGG;IACH,MAAM,CAAC,UAAU,CAAC,GAAY;QAC5B,IAAI,GAAG,YAAY,QAAQ;YAAE,OAAO,GAAG,CAAC;QACxC,IAAI,GAAG,YAAY,KAAK,EAAE,CAAC;YACzB,MAAM,SAAS,GAAG,GAAG,CAAC,OAAO,CAAC,KAAK,CAAC,oBAAoB,CAAC,CAAC;YAC1D,IAAI,SAAS,EAAE,CAAC;gBACd,MAAM,IAAI,GAAG,QAAQ,CAAC,SAAS,CAAC,CAAC,CAAC,EAAE,EAAE,CAAC,CAAC;gBACxC,IAAI,IAAI,IAAI,YAAY,EAAE,CAAC;oBACzB,OAAO,IAAI,QAAQ,CAAC,IAAoB,EAAE,GAAG,CAAC,OAAO,CAAC,CAAC;gBACzD,CAAC;YACH,CAAC;YACD,OAAO,IAAI,QAAQ,CAAC,YAAY,CAAC,iBAAiB,EAAE,GAAG,CAAC,OAAO,CAAC,CAAC;QACnE,CAAC;QACD,OAAO,IAAI,QAAQ,CAAC,YAAY,CAAC,iBAAiB,EAAE,MAAM,CAAC,GAAG,CAAC,CAAC,CAAC;IACnE,CAAC;CACF;AAxCD,4BAwCC"}
\ No newline at end of file
diff --git a/npm/packages/rvf/package.json b/npm/packages/rvf/package.json
index 8fc903635..15341566b 100644
--- a/npm/packages/rvf/package.json
+++ b/npm/packages/rvf/package.json
@@ -19,6 +19,7 @@
   "scripts": {
     "build": "tsc",
     "test": "jest",
+    "smoke:idmap": "node scripts/smoke-idmap-durability.mjs",
     "bench": "tsx bench/index.ts",
     "typecheck": "tsc --noEmit"
   },
diff --git a/npm/packages/rvf/scripts/smoke-idmap-durability.mjs b/npm/packages/rvf/scripts/smoke-idmap-durability.mjs
new file mode 100644
index 000000000..a03a0bd73
--- /dev/null
+++ b/npm/packages/rvf/scripts/smoke-idmap-durability.mjs
@@ -0,0 +1,77 @@
+// Runtime smoke test for #635: the .idmap.json sidecar must be written
+// atomically and must fail loud (not degrade to empty maps) on a corrupt load.
+// Requires a stub @ruvector/rvf-node resolvable from dist/backend.js (the
+// runner sets one up); skips if absent.
+//
+// Run: node scripts/smoke-idmap-durability.mjs   (after `tsc` emits dist/)
+import assert from 'node:assert';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { pathToFileURL } from 'node:url';
+
+const dist = pathToFileURL(path.resolve('dist/index.js')).href;
+const { RvfDatabase, RvfError, RvfErrorCode } = await import(dist);
+
+let passed = 0;
+const ok = (name) => { console.log(`  ok - ${name}`); passed++; };
+
+let nativeAvailable = true;
+try { await import('@ruvector/rvf-node'); } catch { nativeAvailable = false; }
+if (!nativeAvailable) {
+  console.log('  skip - #635 (no @ruvector/rvf-node stub resolvable; run via npm run smoke:idmap)');
+  process.exit(0);
+}
+
+const vec = () => new Float32Array([1, 0, 0, 0]);
+const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'rvf-idmap-'));
+const target = path.join(tmp, 'store.rvf');
+const sidecar = `${target}.idmap.json`;
+
+// 1. Ingest with string ids -> sidecar written atomically (no leftover .tmp).
+{
+  const db = await RvfDatabase.create(target, { dimensions: 4 }, 'node');
+  await db.ingestBatch([
+    { id: 'a', vector: vec() },
+    { id: 'b', vector: vec() },
+  ]);
+  await db.close();
+
+  const sc = JSON.parse(fs.readFileSync(sidecar, 'utf-8'));
+  assert.strictEqual(sc.nextLabel, 3, 'two ids -> labels 1,2 -> nextLabel 3');
+  assert.ok(!fs.existsSync(`${sidecar}.tmp`), 'atomic write leaves no .tmp file');
+  ok('#635 ingest persists sidecar atomically (nextLabel=3, no .tmp)');
+}
+
+// 2. Reopen with a VALID sidecar restores state (nextLabel does NOT reset).
+{
+  const db = await RvfDatabase.open(target, 'node');
+  await db.ingestBatch([{ id: 'c', vector: vec() }]);
+  await db.close();
+
+  const sc = JSON.parse(fs.readFileSync(sidecar, 'utf-8'));
+  assert.strictEqual(sc.nextLabel, 4, 'restored state -> new id gets label 3 -> nextLabel 4 (not reset to 2)');
+  assert.deepStrictEqual(Object.keys(sc.idToLabel).sort(), ['a', 'b', 'c']);
+  ok('#635 reopen restores maps; no label collision on next ingest');
+}
+
+// 3. A corrupt sidecar fails loud (SidecarCorrupt) and is quarantined, not
+//    overwritten with empty/colliding state.
+{
+  fs.writeFileSync(sidecar, '{ this is not valid json ', 'utf-8');
+  await assert.rejects(
+    () => RvfDatabase.open(target, 'node'),
+    (e) =>
+      e instanceof RvfError &&
+      e.code === RvfErrorCode.SidecarCorrupt &&
+      !/fsync/i.test(e.message),
+    'open() on corrupt sidecar should throw SidecarCorrupt',
+  );
+  assert.ok(!fs.existsSync(sidecar), 'corrupt sidecar renamed away (not left to be overwritten)');
+  const quarantined = fs.readdirSync(tmp).filter((f) => f.includes('.idmap.json.corrupt-'));
+  assert.strictEqual(quarantined.length, 1, 'exactly one quarantine file created');
+  ok('#635 corrupt sidecar -> SidecarCorrupt + quarantined (no silent empty-map reset)');
+}
+
+fs.rmSync(tmp, { recursive: true, force: true });
+console.log(`\nAll ${passed} checks passed.`);
diff --git a/npm/packages/rvf/src/backend.ts b/npm/packages/rvf/src/backend.ts
index af64b1dbe..8e5eafe2d 100644
--- a/npm/packages/rvf/src/backend.ts
+++ b/npm/packages/rvf/src/backend.ts
@@ -416,43 +416,87 @@ export class NodeBackend implements RvfBackend {
     return this.storePath ? this.storePath + '.idmap.json' : '';
   }
 
-  /** Persist the string↔label mapping to a sidecar JSON file. */
+  /**
+   * Persist the string↔label mapping to a sidecar JSON file.
+   *
+   * `delete()` resolves string ids through this map and silently filters out
+   * anything unresolvable, so a lost or torn write turns every ingest since
+   * the last good save into an undeletable-by-id vector. Persistence is
+   * therefore NOT best-effort: the write is made atomic (temp file + rename,
+   * so a crash/ENOSPC mid-write can never leave partial JSON at `mp`) and a
+   * failure is surfaced rather than swallowed.
+   */
   private async saveMappings(): Promise<void> {
     const mp = this.mappingsPath();
     if (!mp) return;
+    const fs = await import('fs');
+    const data = JSON.stringify({
+      idToLabel: Object.fromEntries(this.idToLabel),
+      labelToId: Object.fromEntries(
+        Array.from(this.labelToId.entries()).map(([k, v]) => [String(k), v]),
+      ),
+      nextLabel: this.nextLabel,
+    });
+    const tmp = `${mp}.tmp`;
     try {
-      const fs = await import('fs');
-      const data = JSON.stringify({
-        idToLabel: Object.fromEntries(this.idToLabel),
-        labelToId: Object.fromEntries(
-          Array.from(this.labelToId.entries()).map(([k, v]) => [String(k), v]),
-        ),
-        nextLabel: this.nextLabel,
-      });
-      fs.writeFileSync(mp, data, 'utf-8');
-    } catch {
-      // Non-fatal: mapping persistence is best-effort (e.g. read-only FS).
+      fs.writeFileSync(tmp, data, 'utf-8');
+      fs.renameSync(tmp, mp);
+    } catch (err) {
+      try {
+        fs.rmSync(tmp, { force: true });
+      } catch {
+        // best-effort cleanup of the temp file
+      }
+      throw new RvfError(
+        RvfErrorCode.SidecarWriteFailed,
+        `at ${mp}: ${err instanceof Error ? err.message : String(err)}`,
+      );
     }
   }
 
-  /** Load the string↔label mapping from the sidecar JSON file if it exists. */
+  /**
+   * Load the string↔label mapping from the sidecar JSON file if it exists.
+   *
+   * A corrupt sidecar must NOT degrade to empty maps: `nextLabel` would reset
+   * to 1 and subsequent ingests would assign labels colliding with existing
+   * vectors (silent data corruption), and the next `saveMappings()` would
+   * overwrite the recoverable file. Instead the corrupt sidecar is quarantined
+   * (renamed aside so it is not clobbered) and a `SidecarCorrupt` error is
+   * raised so the caller learns string-id operations are unsafe.
+   */
   private async loadMappings(): Promise<void> {
     const mp = this.mappingsPath();
     if (!mp) return;
+    const fs = await import('fs');
+    if (!fs.existsSync(mp)) return; // fresh store: no sidecar yet is legitimate
+    let parsed: {
+      idToLabel?: Record<string, unknown>;
+      labelToId?: Record<string, unknown>;
+      nextLabel?: number;
+    };
     try {
-      const fs = await import('fs');
-      if (!fs.existsSync(mp)) return;
-      const raw = JSON.parse(fs.readFileSync(mp, 'utf-8'));
-      this.idToLabel = new Map(Object.entries(raw.idToLabel ?? {}).map(
-        ([k, v]) => [k, Number(v)],
-      ));
-      this.labelToId = new Map(
-        Object.entries(raw.labelToId ?? {}).map(([k, v]) => [Number(k), v as string]),
+      parsed = JSON.parse(fs.readFileSync(mp, 'utf-8'));
+    } catch (err) {
+      const quarantine = `${mp}.corrupt-${Date.now()}`;
+      try {
+        fs.renameSync(mp, quarantine);
+      } catch {
+        // if we cannot move it aside, leave it in place — still fail loud
+      }
+      throw new RvfError(
+        RvfErrorCode.SidecarCorrupt,
+        `at ${mp} (quarantined to ${quarantine}): string-id delete()/ingest would ` +
+          `silently corrupt data — restore a valid sidecar or recreate the store; ` +
+          `${err instanceof Error ? err.message : String(err)}`,
       );
-      this.nextLabel = raw.nextLabel ?? this.idToLabel.size + 1;
-    } catch {
-      // Non-fatal: start with empty mappings.
     }
+    this.idToLabel = new Map(
+      Object.entries(parsed.idToLabel ?? {}).map(([k, v]) => [k, Number(v)]),
+    );
+    this.labelToId = new Map(
+      Object.entries(parsed.labelToId ?? {}).map(([k, v]) => [Number(k), v as string]),
+    );
+    this.nextLabel = parsed.nextLabel ?? this.idToLabel.size + 1;
   }
 }
 
diff --git a/npm/packages/rvf/src/errors.ts b/npm/packages/rvf/src/errors.ts
index 451d0a507..d51a31f62 100644
--- a/npm/packages/rvf/src/errors.ts
+++ b/npm/packages/rvf/src/errors.ts
@@ -53,6 +53,9 @@ export enum RvfErrorCode {
   BackendInitFailed = 0xff01,
   StoreClosed = 0xff02,
   InvalidOptions = 0xff03,
+  // (0xff04–0xff05 reserved)
+  SidecarWriteFailed = 0xff06,
+  SidecarCorrupt = 0xff07,
 }
 
 /** Human-readable labels for each error code. */
@@ -93,6 +96,8 @@ const ERROR_MESSAGES: Record<number, string> = {
   [RvfErrorCode.BackendInitFailed]: 'Backend initialization failed',
   [RvfErrorCode.StoreClosed]: 'Store has been closed',
   [RvfErrorCode.InvalidOptions]: 'Invalid store creation options',
+  [RvfErrorCode.SidecarWriteFailed]: 'Failed to persist the string-id map sidecar',
+  [RvfErrorCode.SidecarCorrupt]: 'The string-id map sidecar is missing fields or corrupt',
 };
 
 /**