diff --git a/gitnexus/scripts/cross-platform-tests.ts b/gitnexus/scripts/cross-platform-tests.ts
index f12441517..d0ec8caa1 100644
--- a/gitnexus/scripts/cross-platform-tests.ts
+++ b/gitnexus/scripts/cross-platform-tests.ts
@@ -164,6 +164,7 @@ const PLATFORM_LOGIC = [
 // N-API addon which has known platform-specific behavior (Windows
 // file-lock lag after close, macOS N-API destructor segfaults)
 const LBUG_NATIVE = [
+  'test/integration/dangling-owner-edges.test.ts',
   'test/integration/impact-private-type-file-seed.test.ts',
   'test/integration/impact-private-type-source.test.ts',
   // Inline-handler findings must survive native persistence and cold explain
diff --git a/gitnexus/scripts/owner-edge-guard-scaling.ts b/gitnexus/scripts/owner-edge-guard-scaling.ts
new file mode 100644
index 000000000..ad90fb52c
--- /dev/null
+++ b/gitnexus/scripts/owner-edge-guard-scaling.ts
@@ -0,0 +1,321 @@
+/**
+ * Reproducible scaling probe for the per-file owner-edge guard.
+ *
+ * Run alone, after a build, from gitnexus/:
+ * node --expose-gc --import tsx scripts/owner-edge-guard-scaling.ts > /tmp/owner-edge-scaling.json
+ * --operations-only skips timings; --sizes=1024,2048,... --samples=11 --warmup=3 override defaults.
+ *
+ * Timings include guard lifecycle and appending preconstructed rows, excluding
+ * fixture creation, prefix copies, assertions, and explicit GC. Prefix-isolation
+ * timings call the guard directly on a fixed 16-member slice. Proxy counters run
+ * separately: they are deterministic regression checks, never timed thresholds.
+ */
+import assert from 'node:assert/strict';
+import { createHash } from 'node:crypto';
+import { readFileSync } from 'node:fs';
+import { arch, cpus, platform, release } from 'node:os';
+import { performance } from 'node:perf_hooks';
+import { parseArgs } from 'node:util';
+import { SupportedLanguages } from 'gitnexus-shared';
+import {
+  createOwnerEdgeGuard,
+  dropDanglingInFileOwnerEdges,
+} from '../src/core/ingestion/workers/owner-edge-guard.js';
+import type { ParseWorkerResult } from '../src/core/ingestion/workers/parse-worker.js';
+
+const source = readFileSync(
+  new URL('../src/core/ingestion/workers/owner-edge-guard.ts', import.meta.url),
+);
+
+type Slice = Pick<ParseWorkerResult, 'nodes' | 'relationships'>;
+type Rel = Slice['relationships'][number];
+type Shape = 'member-free' | 'clean' | 'dangling' | 'predefined' | 'duplicate' | 'owner-last';
+type FileFixture = Slice & { path: string; expected: Rel[] };
+type Reads = { nodes: number; relationships: number; writes: number };
+
+const { values } = parseArgs({
+  options: {
+    sizes: { type: 'string', default: '1024,2048,4096,8192,16384,32768,65536' },
+    samples: { type: 'string', default: '11' },
+    warmup: { type: 'string', default: '3' },
+    'operations-only': { type: 'boolean', default: false },
+  },
+});
+const sizes = values.sizes.split(',').map(Number);
+const samples = Number(values.samples);
+const warmup = Number(values.warmup);
+assert(
+  sizes.length >= 2 &&
+    sizes.every((n, i) => Number.isSafeInteger(n) && n > 0 && (!i || n > sizes[i - 1])),
+);
+assert(Number.isSafeInteger(samples) && samples >= 3);
+assert(Number.isSafeInteger(warmup) && warmup >= 1);
+
+const edge = (type: Rel['type'], sourceId: string, targetId: string): Rel => ({
+  id: `${type}:${sourceId}->${targetId}`,
+  sourceId,
+  targetId,
+  type,
+  confidence: 1,
+  reason: '',
+});
+
+function fixture(shape: Shape, count: number, file: number): FileFixture {
+  // Fixed-width ids keep the string-length dimension constant across sizes.
+  const path = `src/file-${String(file).padStart(8, '0')}.ts`;
+  const owner = `Class:${path}:Owner`;
+  const result: FileFixture = { path, nodes: [], relationships: [], expected: [] };
+  const addNode = (id: string, label: string): void => {
+    result.nodes.push({
+      id,
+      label,
+      properties: {
+        name: id,
+        filePath: path,
+        startLine: 0,
+        endLine: 0,
+        language: SupportedLanguages.TypeScript,
+        isExported: false,
+      },
+    });
+  };
+  if (shape === 'clean') addNode(owner, 'Class');
+  for (let i = 0; i < count; i++) {
+    const target = `Method:${path}:member-${String(i).padStart(8, '0')}`;
+    const defined = edge('DEFINES', `File:${path}`, target);
+    const member = edge(i % 2 ? 'HAS_PROPERTY' : 'HAS_METHOD', owner, target);
+    addNode(target, 'Method');
+    if (shape === 'member-free' || shape === 'predefined') result.relationships.push(defined);
+    if (shape !== 'member-free') result.relationships.push(member);
+    if (shape === 'duplicate') result.relationships.push(edge('HAS_PROPERTY', owner, target));
+    result.expected.push(shape === 'clean' || shape === 'owner-last' ? member : defined);
+  }
+  if (shape === 'owner-last') addNode(owner, 'Class');
+  return result;
+}
+
+function files(shape: Shape, count: number, perFile: number): FileFixture[] {
+  const result: FileFixture[] = [];
+  for (let i = 0; i < count; i += perFile)
+    result.push(fixture(shape, Math.min(perFile, count - i), i / perFile));
+  return result;
+}
+
+function append(target: Slice, file: Slice): void {
+  for (const node of file.nodes) target.nodes.push(node);
+  for (const rel of file.relationships) target.relationships.push(rel);
+}
+
+function verify(result: Slice, expected: Rel[], nodeCount: number): void {
+  assert.equal(result.nodes.length, nodeCount);
+  assert.deepEqual(result.relationships, expected);
+}
+
+/** Count numeric array accesses only while the production guard runs. */
+function operations(input: FileFixture[], prefix: Slice): Reads {
+  const raw: Slice = { nodes: prefix.nodes.slice(), relationships: prefix.relationships.slice() };
+  let nodeStart = raw.nodes.length;
+  let relStart = raw.relationships.length;
+  const reads: Reads = { nodes: 0, relationships: 0, writes: 0 };
+  const watched = <T>(array: T[], kind: 'nodes' | 'relationships'): T[] =>
+    new Proxy(array, {
+      get(target, property, receiver) {
+        if (typeof property === 'string' && /^(0|[1-9]\d*)$/.test(property)) {
+          assert(
+            Number(property) >= (kind === 'nodes' ? nodeStart : relStart),
+            `rescanned previous ${kind}`,
+          );
+          reads[kind]++;
+        }
+        return Reflect.get(target, property, receiver);
+      },
+      set(target, property, value, receiver) {
+        if (typeof property === 'string' && /^(0|[1-9]\d*)$/.test(property)) {
+          assert(
+            Number(property) >= (kind === 'nodes' ? nodeStart : relStart),
+            `rewrote previous ${kind}`,
+          );
+          reads.writes++;
+        }
+        return Reflect.set(target, property, value, receiver);
+      },
+    });
+  const guarded = {
+    nodes: watched(raw.nodes, 'nodes'),
+    relationships: watched(raw.relationships, 'relationships'),
+  };
+  const guard = createOwnerEdgeGuard(guarded);
+  for (const file of input) {
+    guard.open(file.path); // Settles the previous slice before the boundaries advance.
+    nodeStart = raw.nodes.length;
+    relStart = raw.relationships.length;
+    append(raw, file); // Fixture appends bypass the access counters.
+  }
+  guard.settle();
+  const settledReads = { ...reads };
+  guard.settle();
+  assert.deepEqual(reads, settledReads, 'settling twice rescans a file');
+  const n = input.reduce((sum, file) => sum + file.nodes.length, 0);
+  const e = input.reduce((sum, file) => sum + file.relationships.length, 0);
+  assert(reads.nodes <= n, 'more than one node pass');
+  assert(reads.relationships <= 3 * e, 'more than three relationship passes');
+  assert(reads.writes <= e, 'more than one compaction pass');
+  verify(
+    raw,
+    [...prefix.relationships, ...input.flatMap((file) => file.expected)],
+    prefix.nodes.length + n,
+  );
+  return reads;
+}
+
+function trial(input: FileFixture[], prefix: Slice, direct: boolean, expected: Rel[]): number {
+  const result: Slice = {
+    nodes: prefix.nodes.slice(),
+    relationships: prefix.relationships.slice(),
+  };
+  const nodeStart = result.nodes.length;
+  const relStart = result.relationships.length;
+  if (direct) append(result, input[0]);
+  globalThis.gc?.();
+  const start = performance.now();
+  if (direct) {
+    dropDanglingInFileOwnerEdges(result, input[0].path, nodeStart, relStart);
+  } else {
+    const guard = createOwnerEdgeGuard(result);
+    for (const file of input) {
+      guard.open(file.path);
+      append(result, file);
+    }
+    guard.settle();
+  }
+  const elapsed = performance.now() - start;
+  verify(
+    result,
+    expected,
+    prefix.nodes.length + input.reduce((sum, file) => sum + file.nodes.length, 0),
+  );
+  return elapsed;
+}
+
+const percentile = (values: number[], fraction: number): number => {
+  const sorted = [...values].sort((a, b) => a - b);
+  return sorted[Math.ceil(fraction * sorted.length) - 1];
+};
+
+function measure(shape: Shape, count: number, perFile: number, prefixCount = 0) {
+  const input = files(shape, count, perFile);
+  const prefix = prefixCount
+    ? fixture('member-free', prefixCount, 99999999)
+    : { nodes: [], relationships: [] };
+  const nodes = input.reduce((sum, file) => sum + file.nodes.length, 0);
+  const relationships = input.reduce((sum, file) => sum + file.relationships.length, 0);
+  const counts = operations(input, prefix);
+  const direct = prefixCount > 0;
+  const samplesMs: number[] = [];
+  if (!values['operations-only']) {
+    for (let i = 0; i < warmup + samples; i++) {
+      const freshInput = files(shape, count, perFile);
+      const expected = [...prefix.relationships, ...freshInput.flatMap((file) => file.expected)];
+      const elapsed = trial(freshInput, prefix, direct, expected);
+      if (i >= warmup) samplesMs.push(elapsed);
+    }
+  }
+  const medianMs = samplesMs.length ? percentile(samplesMs, 0.5) : null;
+  return {
+    shape,
+    members: count,
+    files: input.length,
+    prefixRows: prefix.nodes.length + prefix.relationships.length,
+    nodes,
+    relationships,
+    indexedReads: counts,
+    samplesMs,
+    medianMs,
+    p95Ms: samplesMs.length ? percentile(samplesMs, 0.95) : null,
+    nsPerRow: medianMs === null ? null : (medianMs * 1e6) / (nodes + relationships),
+  };
+}
+
+function slope(points: { x: number; y: number }[]): number | null {
+  if (points.length < 2 || points.some(({ x, y }) => x <= 0 || y <= 0)) return null;
+  const xs = points.map(({ x }) => Math.log(x));
+  const ys = points.map(({ y }) => Math.log(y));
+  const meanX = xs.reduce((a, b) => a + b, 0) / xs.length;
+  const meanY = ys.reduce((a, b) => a + b, 0) / ys.length;
+  return (
+    xs.reduce((sum, x, i) => sum + (x - meanX) * (ys[i] - meanY), 0) /
+    xs.reduce((sum, x) => sum + (x - meanX) ** 2, 0)
+  );
+}
+
+const cases: ReturnType<typeof measure>[] = [];
+const scaling: { shape: Shape; distribution: string; logLogSlope: number | null }[] = [];
+const shapes: Shape[] = [
+  'member-free',
+  'clean',
+  'dangling',
+  'predefined',
+  'duplicate',
+  'owner-last',
+];
+// Alternate ascending/descending sizes to avoid tying every large case to late-run thermal drift.
+for (const [shapeIndex, shape] of shapes.entries()) {
+  for (const distribution of ['one-file', 'many-files']) {
+    const rows = (shapeIndex % 2 ? [...sizes].reverse() : sizes).map((size) =>
+      measure(shape, size, distribution === 'one-file' ? size : 16),
+    );
+    cases.push(...rows);
+    scaling.push({
+      shape,
+      distribution,
+      logLogSlope: values['operations-only']
+        ? null
+        : slope(
+            rows.flatMap((row) =>
+              row.medianMs === null ? [] : [{ x: row.nodes + row.relationships, y: row.medianMs }],
+            ),
+          ),
+    });
+    process.stderr.write(`Validated ${shape} / ${distribution}\n`);
+  }
+}
+const prefixIsolation = sizes.map((size) => measure('dangling', 16, 16, size));
+process.stdout.write(
+  `${JSON.stringify(
+    {
+      schema: 'gitnexus.owner-edge-guard-scaling/v1',
+      recordedAt: new Date().toISOString(),
+      environment: {
+        node: process.version,
+        v8: process.versions.v8,
+        platform: platform(),
+        arch: arch(),
+        release: release(),
+        cpu: cpus()[0]?.model,
+        explicitGc: typeof globalThis.gc === 'function',
+        processMaxRssKiB: process.resourceUsage().maxRSS,
+      },
+      sourceSha256: createHash('sha256').update(source).digest('hex'),
+      config: { sizes, samples, warmup, operationsOnly: values['operations-only'] },
+      methodology: {
+        timed:
+          'guard lifecycle + append preconstructed rows; prefixIsolation times only the direct guard',
+        excluded:
+          'fresh fixture generation for every sample, prefix copies, assertions, explicit GC, Proxy instrumentation',
+        statistics:
+          'nearest-rank median/p95; least-squares slope of log(median ms) versus log(active rows)',
+        operations:
+          'at most one indexed node read, three indexed relationship reads, one relationship write per active row; no earlier-slice indexed accesses',
+        limits:
+          'Kernel benchmark, not end-to-end indexing throughput. Timings and slopes are descriptive, not asymptotic proof. maxRSS covers all fixtures and validation and is not guard peak memory. Set operations assume average constant-time hashing; string work scales with id lengths.',
+        memory:
+          'Live guard scratch is O(nodes + edges) of the largest active file; output accumulation and delayed garbage collection are excluded from that bound.',
+      },
+      cases,
+      scaling,
+      prefixIsolation,
+    },
+    null,
+    2,
+  )}\n`,
+);
diff --git a/gitnexus/src/core/ingestion/workers/owner-edge-guard.ts b/gitnexus/src/core/ingestion/workers/owner-edge-guard.ts
new file mode 100644
index 000000000..7c7809ccb
--- /dev/null
+++ b/gitnexus/src/core/ingestion/workers/owner-edge-guard.ts
@@ -0,0 +1,109 @@
+/**
+ * Per-file guard against member edges whose owner node was never emitted.
+ *
+ * Owner ids are minted from syntax (the binding an object literal is assigned
+ * to, the enclosing container), while node labels come from the query captures,
+ * so the two can disagree (#3747): `const X = z.object({ k: f(() => 0) }).refine(cb)`
+ * is emitted as `Function:<file>:X` but its key's owner is spelled
+ * `Const:<file>:X`, and a TS `declare module 'm' {}` owns its members under a
+ * `Trait` id no TS capture ever emits. LadybugDB's COPY rejects such an edge and
+ * the retry silently drops it.
+ *
+ * Kept free of worker side effects so it can be unit-tested directly.
+ */
+import { generateId } from '../../../lib/utils.js';
+import type { ParseWorkerResult } from './parse-worker.js';
+
+const isMemberEdge = (type: string): boolean => type === 'HAS_METHOD' || type === 'HAS_PROPERTY';
+
+/**
+ * Remove `HAS_METHOD` / `HAS_PROPERTY` edges appended for `filePath` (from
+ * `relStart` on) whose owner id names a node in that same file that the file
+ * did not emit (from `nodeStart` on). The orphaned member is re-attached to its
+ * File with `DEFINES` unless it already has one.
+ *
+ * Owners in other files are left alone: they are resolved across the whole
+ * graph, not per file.
+ */
+export const dropDanglingInFileOwnerEdges = (
+  result: Pick<ParseWorkerResult, 'nodes' | 'relationships'>,
+  filePath: string,
+  nodeStart: number,
+  relStart: number,
+): void => {
+  const rels = result.relationships;
+  const inFilePrefix = `:${filePath}:`;
+  let emitted: Set<string> | null = null;
+  let dangling: Set<number> | null = null;
+
+  for (let i = relStart; i < rels.length; i++) {
+    const rel = rels[i];
+    if (!isMemberEdge(rel.type)) continue;
+    const labelEnd = rel.sourceId.indexOf(':');
+    if (labelEnd < 0 || !rel.sourceId.startsWith(inFilePrefix, labelEnd)) continue;
+    if (emitted === null) {
+      emitted = new Set<string>();
+      for (let n = nodeStart; n < result.nodes.length; n++) emitted.add(result.nodes[n].id);
+    }
+    if (!emitted.has(rel.sourceId)) (dangling ??= new Set<number>()).add(i);
+  }
+  if (dangling === null || emitted === null) return;
+
+  const fileId = generateId('File', filePath);
+  const defined = new Set<string>();
+  for (let i = relStart; i < rels.length; i++) {
+    const rel = rels[i];
+    if (rel.type === 'DEFINES' && rel.sourceId === fileId) defined.add(rel.targetId);
+  }
+
+  let write = relStart;
+  for (let i = relStart; i < rels.length; i++) {
+    const rel = rels[i];
+    if (!dangling.has(i)) {
+      rels[write++] = rel;
+      continue;
+    }
+    if (defined.has(rel.targetId) || !emitted.has(rel.targetId)) continue;
+    defined.add(rel.targetId);
+    rels[write++] = {
+      id: generateId('DEFINES', `${fileId}->${rel.targetId}`),
+      sourceId: fileId,
+      targetId: rel.targetId,
+      type: 'DEFINES',
+      confidence: 1.0,
+      reason: '',
+    };
+  }
+  rels.length = write;
+};
+
+/** Tracks the file whose slice of a worker result is still being appended. */
+export interface OwnerEdgeGuard {
+  /** Settle the previous file, then start tracking what `filePath` appends. */
+  open(filePath: string): void;
+  /** Settle the tracked file, if any. Safe to call more than once. */
+  settle(): void;
+}
+
+export const createOwnerEdgeGuard = (
+  result: Pick<ParseWorkerResult, 'nodes' | 'relationships'>,
+): OwnerEdgeGuard => {
+  let current: { path: string; nodeStart: number; relStart: number } | null = null;
+  const settle = (): void => {
+    if (current === null) return;
+    const file = current;
+    current = null;
+    dropDanglingInFileOwnerEdges(result, file.path, file.nodeStart, file.relStart);
+  };
+  return {
+    open(filePath: string): void {
+      settle();
+      current = {
+        path: filePath,
+        nodeStart: result.nodes.length,
+        relStart: result.relationships.length,
+      };
+    },
+    settle,
+  };
+};
diff --git a/gitnexus/src/core/ingestion/workers/parse-worker.ts b/gitnexus/src/core/ingestion/workers/parse-worker.ts
index fb0a43b2b..a2599ba76 100644
--- a/gitnexus/src/core/ingestion/workers/parse-worker.ts
+++ b/gitnexus/src/core/ingestion/workers/parse-worker.ts
@@ -138,6 +138,7 @@ import { buildTypeEnv } from '../type-env.js';
 import type { ConstructorBinding } from '../type-env.js';
 import { detectFrameworkFromAST } from '../framework-detection.js';
 import { generateId } from '../../../lib/utils.js';
+import { createOwnerEdgeGuard, type OwnerEdgeGuard } from './owner-edge-guard.js';
 import { defaultExportNameCollides } from '../languages/typescript/cjs-export-assignment.js';
 import {
   extractVueScript,
@@ -1595,6 +1596,23 @@ const processFileGroup = (
   queryString: string,
   result: ParseWorkerResult,
   onFileProcessed?: () => void,
+): void => {
+  const ownerEdgeGuard = createOwnerEdgeGuard(result);
+  try {
+    processFileGroupFiles(files, language, queryString, result, ownerEdgeGuard, onFileProcessed);
+  } finally {
+    // Also on a throw: processBatch keeps the partial result of a failed group.
+    ownerEdgeGuard.settle();
+  }
+};
+
+const processFileGroupFiles = (
+  files: ParseWorkerInput[],
+  language: SupportedLanguages,
+  queryString: string,
+  result: ParseWorkerResult,
+  ownerEdgeGuard: OwnerEdgeGuard,
+  onFileProcessed?: () => void,
 ): void => {
   let query: Parser.Query;
   try {
@@ -1615,6 +1633,8 @@ const processFileGroup = (
   }
 
   for (const file of files) {
+    // Settles the previous file, so every `continue` below still gets checked.
+    ownerEdgeGuard.open(file.path);
     // Skip files larger than the max tree-sitter buffer (32 MB)
     if (getTreeSitterContentByteLength(file.content) > TREE_SITTER_MAX_BUFFER) continue;
 
diff --git a/gitnexus/test/integration/dangling-owner-edges.test.ts b/gitnexus/test/integration/dangling-owner-edges.test.ts
new file mode 100644
index 000000000..a603bf780
--- /dev/null
+++ b/gitnexus/test/integration/dangling-owner-edges.test.ts
@@ -0,0 +1,163 @@
+/**
+ * #3747: a member edge must never name an owner node the file did not emit.
+ * Both fixtures are the reporter's repro; before the fix each produced one
+ * HAS_METHOD edge that LadybugDB's COPY rejected with
+ * "Unable to find primary key value".
+ */
+import { describe, expect, it } from 'vitest';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import { pathToFileURL } from 'node:url';
+import {
+  closeLbug,
+  executeQuery,
+  initLbug,
+  loadGraphToLbug,
+} from '../../src/core/lbug/lbug-adapter.js';
+import { runPipelineFromRepo } from '../../src/core/ingestion/pipeline.js';
+import { createTempDir } from '../helpers/test-db.js';
+import { DIST_WORKER_URL, parseFilesWithWorkers } from '../helpers/worker-parse.js';
+import { createWorkerPool } from '../../src/core/ingestion/workers/worker-pool.js';
+import type {
+  ParseWorkerInput,
+  ParseWorkerResult,
+} from '../../src/core/ingestion/workers/parse-worker.js';
+import { findDanglingEdges } from './resolvers/helpers.js';
+
+const CHAINED_CONST = `import { z } from 'zod';
+
+const KEY = 'BRANCH';
+const Branch = z.string();
+
+const Context = z
+  .object({
+    REF: z.string(),
+    [KEY]: Branch,
+    REPO: z.string().refine((value) => value.split('/').every((p) => p !== '..')),
+  })
+  .refine((context) => context.REF === \`refs/heads/\${context[KEY]}\`, {
+    message: 'REF must be the branch head',
+  });
+
+export function run(env) {
+  const context = Context.parse(env);
+  return context;
+}
+`;
+
+const AMBIENT_MODULE = `declare module 'somelib' {
+  export function connect(opts: { user: string }): Promise<void>;
+  const lib: { connect: typeof connect };
+  export default lib;
+}
+`;
+
+const OBJECT_LITERAL_CONTROL = `export const service = {
+  load() { return 1; },
+  save: () => 2,
+};
+`;
+
+describe('#3747 member edges only name emitted owners', () => {
+  it('leaves no dangling member edge and keeps every member reachable from its file', async () => {
+    const { graph } = await parseFilesWithWorkers([
+      { path: 'ctx.mjs', content: CHAINED_CONST },
+      { path: 'types/lib.d.ts', content: AMBIENT_MODULE },
+    ]);
+    expect(findDanglingEdges({ graph } as never, ['HAS_METHOD', 'HAS_PROPERTY'])).toEqual([]);
+
+    const definedFromFile = (file: string): string[] =>
+      graph.relationships
+        .filter((edge) => edge.type === 'DEFINES' && edge.sourceId === `File:${file}`)
+        .map((edge) => edge.targetId);
+    const repo = graph.nodes.find(
+      (n) => n.properties.filePath === 'ctx.mjs' && n.properties.name === 'REPO',
+    );
+    const connect = graph.nodes.find(
+      (n) => n.properties.filePath === 'types/lib.d.ts' && n.properties.name === 'connect',
+    );
+    expect(repo).toBeDefined();
+    expect(connect).toBeDefined();
+    expect(definedFromFile('ctx.mjs')).toContain(repo?.id);
+    expect(definedFromFile('types/lib.d.ts')).toContain(connect?.id);
+  });
+
+  it('keeps object-literal members owned by their emitted binding', async () => {
+    const { graph } = await parseFilesWithWorkers([
+      { path: 'service.ts', content: OBJECT_LITERAL_CONTROL },
+    ]);
+    const owner = graph.nodes.find(
+      (n) => n.properties.filePath === 'service.ts' && n.properties.name === 'service',
+    );
+    expect(owner).toBeDefined();
+    const members = graph.relationships
+      .filter((edge) => edge.type === 'HAS_METHOD' && edge.sourceId === owner?.id)
+      .map((edge) => graph.getNode(edge.targetId)?.properties.name)
+      .sort();
+    expect(members).toEqual(['load', 'save']);
+  });
+
+  it('persists every relationship through native COPY', async () => {
+    const temp = await createTempDir();
+    try {
+      await fs.mkdir(path.join(temp.dbPath, 'types'), { recursive: true });
+      await fs.writeFile(path.join(temp.dbPath, 'ctx.mjs'), CHAINED_CONST);
+      await fs.writeFile(path.join(temp.dbPath, 'types', 'lib.d.ts'), AMBIENT_MODULE);
+      const result = await runPipelineFromRepo(temp.dbPath, () => {}, { workerPoolSize: 1 });
+      expect(result.usedWorkerPool).toBe(true);
+      expect(findDanglingEdges(result)).toEqual([]);
+
+      await initLbug(path.join(temp.dbPath, 'lbug'), { skipFts: true });
+      await loadGraphToLbug(result.graph, temp.dbPath, path.join(temp.dbPath, 'storage'));
+      const [row] = await executeQuery('MATCH ()-[r:CodeRelation]->() RETURN count(r) AS edges');
+      expect(Number(row.edges)).toBe(result.graph.relationships.length);
+    } finally {
+      await closeLbug();
+      await temp.cleanup();
+    }
+  });
+
+  it('settles the partial file when a real parser provider throws after emitting members', async () => {
+    const temp = await createTempDir();
+    const bootstrap = path.join(temp.dbPath, 'throwing-provider.mjs');
+    const providersUrl = new URL('../languages/index.js', DIST_WORKER_URL).href;
+    // Inject the failure in the worker isolate, leaving the production loop and
+    // its finally intact. Removing that finally must make this regression fail.
+    await fs.writeFile(
+      bootstrap,
+      `
+      const { getProvider } = await import(${JSON.stringify(providersUrl)});
+      getProvider('javascript').extractToolDefinitions = () => {
+        throw new Error('owner-edge-guard provider fault');
+      };
+      await import(${JSON.stringify(DIST_WORKER_URL.href)});
+    `,
+    );
+    const pool = createWorkerPool(pathToFileURL(bootstrap), 1);
+    try {
+      const [result] = await pool.dispatch<ParseWorkerInput, ParseWorkerResult>([
+        { path: 'ctx.mjs', content: CHAINED_CONST },
+        { path: 'after.mjs', content: 'export function shouldNotParse() {}' },
+      ]);
+      // The first file is counted before the provider throws; the remaining
+      // file is skipped, proving the injected failure reached processBatch.
+      expect(result.fileCount).toBe(1);
+      expect(result.nodes.some((node) => node.properties.name === 'shouldNotParse')).toBe(false);
+      const member = result.nodes.find((node) => node.properties.name === 'REPO');
+      expect(member).toBeDefined();
+      expect(result.relationships.filter((edge) => edge.targetId === member?.id)).toEqual([
+        {
+          id: `DEFINES:File:ctx.mjs->${member?.id}`,
+          sourceId: 'File:ctx.mjs',
+          targetId: member?.id,
+          type: 'DEFINES',
+          confidence: 1,
+          reason: '',
+        },
+      ]);
+    } finally {
+      await pool.terminate();
+      await temp.cleanup();
+    }
+  });
+});
diff --git a/gitnexus/test/unit/owner-edge-guard-scaling.test.ts b/gitnexus/test/unit/owner-edge-guard-scaling.test.ts
new file mode 100644
index 000000000..471e6d595
--- /dev/null
+++ b/gitnexus/test/unit/owner-edge-guard-scaling.test.ts
@@ -0,0 +1,97 @@
+import { describe, expect, it } from 'vitest';
+import { SupportedLanguages } from 'gitnexus-shared';
+import { createOwnerEdgeGuard } from '../../src/core/ingestion/workers/owner-edge-guard.js';
+import type { ParseWorkerResult } from '../../src/core/ingestion/workers/parse-worker.js';
+
+type Slice = Pick<ParseWorkerResult, 'nodes' | 'relationships'>;
+type Rel = Slice['relationships'][number];
+
+const memberNode = (path: string, member: number): Slice['nodes'][number] => ({
+  id: `Method:${path}:m${member}`,
+  label: 'Method',
+  properties: {
+    name: `m${member}`,
+    filePath: path,
+    startLine: 0,
+    endLine: 0,
+    language: SupportedLanguages.TypeScript,
+    isExported: false,
+  },
+});
+
+const memberEdge = (type: Rel['type'], sourceId: string, targetId: string): Rel => ({
+  id: `${type}:${sourceId}->${targetId}`,
+  sourceId,
+  targetId,
+  type,
+  confidence: 1,
+  reason: '',
+});
+
+describe('owner-edge guard scaling', () => {
+  it.each([8, 32, 128])('processes %i files without rescanning completed files', (fileCount) => {
+    const prefixNode = memberNode('previous.ts', 0);
+    const prefixEdge = memberEdge('DEFINES', 'File:previous.ts', prefixNode.id);
+    const raw: Slice = { nodes: [prefixNode], relationships: [prefixEdge] };
+    let nodeStart = 1;
+    let relStart = 1;
+    let nodeReads = 0;
+    let relReads = 0;
+    let relWrites = 0;
+    const guarded: Slice = {
+      nodes: new Proxy(raw.nodes, {
+        get(target, property, receiver) {
+          if (typeof property === 'string' && /^(0|[1-9]\d*)$/.test(property)) {
+            expect(Number(property)).toBeGreaterThanOrEqual(nodeStart);
+            nodeReads++;
+          }
+          return Reflect.get(target, property, receiver);
+        },
+      }),
+      relationships: new Proxy(raw.relationships, {
+        get(target, property, receiver) {
+          if (typeof property === 'string' && /^(0|[1-9]\d*)$/.test(property)) {
+            expect(Number(property)).toBeGreaterThanOrEqual(relStart);
+            relReads++;
+          }
+          return Reflect.get(target, property, receiver);
+        },
+        set(target, property, value, receiver) {
+          if (typeof property === 'string' && /^(0|[1-9]\d*)$/.test(property)) {
+            expect(Number(property)).toBeGreaterThanOrEqual(relStart);
+            relWrites++;
+          }
+          return Reflect.set(target, property, value, receiver);
+        },
+      }),
+    };
+    const guard = createOwnerEdgeGuard(guarded);
+    for (let file = 0; file < fileCount; file++) {
+      const path = `file-${file}.ts`;
+      guard.open(path);
+      nodeStart = raw.nodes.length;
+      relStart = raw.relationships.length;
+      for (let member = 0; member < 8; member++) {
+        const node = memberNode(path, member);
+        raw.nodes.push(node);
+        if (member % 2 === 0)
+          raw.relationships.push(memberEdge('DEFINES', `File:${path}`, node.id));
+        raw.relationships.push(memberEdge('HAS_METHOD', `Class:${path}:Missing`, node.id));
+        raw.relationships.push(memberEdge('HAS_PROPERTY', `Class:${path}:Missing`, node.id));
+      }
+    }
+    guard.settle();
+    // Bound work by current-file input, including duplicate and already-defined members.
+    expect(nodeReads).toBeGreaterThan(0);
+    expect(nodeReads).toBeLessThanOrEqual(fileCount * 8);
+    expect(relReads).toBeGreaterThan(0);
+    expect(relReads).toBeLessThanOrEqual(fileCount * 20 * 3);
+    expect(relWrites).toBeLessThanOrEqual(fileCount * 20);
+    expect(raw.relationships).toHaveLength(1 + fileCount * 8);
+    expect(raw.relationships[0]).toBe(prefixEdge);
+    expect(raw.relationships.every((rel) => rel.type === 'DEFINES')).toBe(true);
+    expect(new Set(raw.relationships.map((rel) => rel.targetId)).size).toBe(
+      raw.relationships.length,
+    );
+  });
+});
diff --git a/gitnexus/test/unit/owner-edge-guard.test.ts b/gitnexus/test/unit/owner-edge-guard.test.ts
new file mode 100644
index 000000000..2da9ea1a1
--- /dev/null
+++ b/gitnexus/test/unit/owner-edge-guard.test.ts
@@ -0,0 +1,148 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  createOwnerEdgeGuard,
+  dropDanglingInFileOwnerEdges,
+} from '../../src/core/ingestion/workers/owner-edge-guard.js';
+import type { ParseWorkerResult } from '../../src/core/ingestion/workers/parse-worker.js';
+
+type Slice = Pick<ParseWorkerResult, 'nodes' | 'relationships'>;
+type Rel = Slice['relationships'][number];
+
+const node = (id: string): Slice['nodes'][number] =>
+  ({ id, label: id.slice(0, id.indexOf(':')), properties: {} }) as Slice['nodes'][number];
+
+const rel = (type: Rel['type'], sourceId: string, targetId: string): Rel => ({
+  id: `${type}:${sourceId}->${targetId}`,
+  sourceId,
+  targetId,
+  type,
+  confidence: 1,
+  reason: '',
+});
+
+const summarize = (slice: Slice): string[] =>
+  slice.relationships.map((r) => `${r.type} ${r.sourceId} -> ${r.targetId}`);
+
+describe('dropDanglingInFileOwnerEdges', () => {
+  it('re-attaches a member whose in-file owner was never emitted to its File', () => {
+    const slice: Slice = {
+      nodes: [node('Function:types/lib.d.ts:m.connect')],
+      relationships: [
+        rel('HAS_METHOD', "Trait:types/lib.d.ts:'m'", 'Function:types/lib.d.ts:m.connect'),
+      ],
+    };
+    dropDanglingInFileOwnerEdges(slice, 'types/lib.d.ts', 0, 0);
+    expect(summarize(slice)).toEqual([
+      'DEFINES File:types/lib.d.ts -> Function:types/lib.d.ts:m.connect',
+    ]);
+  });
+
+  it('drops the edge without duplicating an existing DEFINES', () => {
+    const slice: Slice = {
+      nodes: [node('Function:a.mjs:Context'), node('Function:a.mjs:Context.REPO')],
+      relationships: [
+        rel('DEFINES', 'File:a.mjs', 'Function:a.mjs:Context.REPO'),
+        rel('HAS_METHOD', 'Const:a.mjs:Context', 'Function:a.mjs:Context.REPO'),
+        rel('HAS_PROPERTY', 'Const:a.mjs:Context', 'Property:a.mjs:Context.REF'),
+      ],
+    };
+    slice.nodes.push(node('Property:a.mjs:Context.REF'));
+    dropDanglingInFileOwnerEdges(slice, 'a.mjs', 0, 0);
+    expect(summarize(slice)).toEqual([
+      'DEFINES File:a.mjs -> Function:a.mjs:Context.REPO',
+      'DEFINES File:a.mjs -> Property:a.mjs:Context.REF',
+    ]);
+  });
+
+  it('keeps edges whose owner the file emitted, owners in other files, and non-member edges', () => {
+    const slice: Slice = {
+      nodes: [node('Const:a.ts:svc'), node('Method:a.ts:load'), node('Method:a.ts:Server.run')],
+      relationships: [
+        rel('HAS_METHOD', 'Const:a.ts:svc', 'Method:a.ts:load'),
+        rel('HAS_METHOD', 'Struct:b.ts:Server', 'Method:a.ts:Server.run'),
+        rel('DECLARES', 'Const:a.ts:gone', 'Method:a.ts:load'),
+      ],
+    };
+    const before = summarize(slice);
+    dropDanglingInFileOwnerEdges(slice, 'a.ts', 0, 0);
+    expect(summarize(slice)).toEqual(before);
+  });
+
+  it('does not treat a path that merely shares a prefix as the same file', () => {
+    const slice: Slice = {
+      nodes: [node('Method:a.ts:run')],
+      relationships: [rel('HAS_METHOD', 'Class:a.ts.bak:Foo', 'Method:a.ts:run')],
+    };
+    const before = summarize(slice);
+    dropDanglingInFileOwnerEdges(slice, 'a.ts', 0, 0);
+    expect(summarize(slice)).toEqual(before);
+  });
+
+  it('only inspects the current file slice', () => {
+    const slice: Slice = {
+      nodes: [node('Method:prev.ts:m'), node('Method:cur.ts:m')],
+      relationships: [
+        rel('HAS_METHOD', 'Const:cur.ts:Owner', 'Method:prev.ts:m'),
+        rel('HAS_METHOD', 'Const:cur.ts:Owner', 'Method:cur.ts:m'),
+      ],
+    };
+    dropDanglingInFileOwnerEdges(slice, 'cur.ts', 1, 1);
+    expect(summarize(slice)).toEqual([
+      'HAS_METHOD Const:cur.ts:Owner -> Method:prev.ts:m',
+      'DEFINES File:cur.ts -> Method:cur.ts:m',
+    ]);
+  });
+
+  it('treats an owner emitted earlier in the same file as present', () => {
+    const slice: Slice = {
+      nodes: [node('Class:cur.ts:Foo'), node('Method:cur.ts:Foo.m')],
+      relationships: [rel('HAS_METHOD', 'Class:cur.ts:Foo', 'Method:cur.ts:Foo.m')],
+    };
+    dropDanglingInFileOwnerEdges(slice, 'cur.ts', 0, 0);
+    expect(summarize(slice)).toEqual(['HAS_METHOD Class:cur.ts:Foo -> Method:cur.ts:Foo.m']);
+  });
+});
+
+describe('createOwnerEdgeGuard', () => {
+  it('settles the previous file when the next one opens', () => {
+    const slice: Slice = { nodes: [], relationships: [] };
+    const guard = createOwnerEdgeGuard(slice);
+    guard.open('a.ts');
+    slice.nodes.push(node('Method:a.ts:m'));
+    slice.relationships.push(rel('HAS_METHOD', 'Const:a.ts:Gone', 'Method:a.ts:m'));
+    guard.open('b.ts');
+    expect(summarize(slice)).toEqual(['DEFINES File:a.ts -> Method:a.ts:m']);
+  });
+
+  it('settles a file whose processing threw', () => {
+    const slice: Slice = { nodes: [], relationships: [] };
+    const guard = createOwnerEdgeGuard(slice);
+    expect(() => {
+      try {
+        guard.open('a.ts');
+        slice.nodes.push(node('Function:a.ts:X.k'));
+        slice.relationships.push(rel('HAS_METHOD', 'Const:a.ts:X', 'Function:a.ts:X.k'));
+        throw new Error('extractor failed after member edges were appended');
+      } finally {
+        guard.settle();
+      }
+    }).toThrow('extractor failed');
+    expect(summarize(slice)).toEqual(['DEFINES File:a.ts -> Function:a.ts:X.k']);
+  });
+
+  it('settles each file once', () => {
+    const slice: Slice = { nodes: [], relationships: [] };
+    const guard = createOwnerEdgeGuard(slice);
+    guard.open('a.ts');
+    slice.nodes.push(node('Method:a.ts:m'));
+    slice.relationships.push(rel('HAS_METHOD', 'Const:a.ts:Gone', 'Method:a.ts:m'));
+    guard.settle();
+    slice.relationships.push(rel('HAS_METHOD', 'Const:a.ts:Late', 'Method:a.ts:m'));
+    guard.settle();
+    expect(summarize(slice)).toEqual([
+      'DEFINES File:a.ts -> Method:a.ts:m',
+      'HAS_METHOD Const:a.ts:Late -> Method:a.ts:m',
+    ]);
+  });
+});
diff --git a/gitnexus/vitest.config.ts b/gitnexus/vitest.config.ts
index 71945fd5b..ba93e6c84 100644
--- a/gitnexus/vitest.config.ts
+++ b/gitnexus/vitest.config.ts
@@ -72,6 +72,7 @@ export default defineConfig({
         test: {
           name: 'lbug-db',
           include: [
+            'test/integration/dangling-owner-edges.test.ts',
             'test/integration/class-expression-owners.test.ts',
             'test/integration/rename-provider-*.test.ts',
             'test/integration/pdg-explicit-owner.test.ts',
@@ -183,6 +184,7 @@ export default defineConfig({
           sequence: { groupOrder: 3 },
           include: ['test/**/*.test.ts'],
           exclude: [
+            'test/integration/dangling-owner-edges.test.ts',
             'test/integration/class-expression-owners.test.ts',
             'test/integration/rename-provider-*.test.ts',
             'test/integration/pdg-explicit-owner.test.ts',