diff --git a/api-v3/src/asset-master/merged-inventory-dossier.service.ts b/api-v3/src/asset-master/merged-inventory-dossier.service.ts
new file mode 100644
index 0000000..619cdc5
--- /dev/null
+++ b/api-v3/src/asset-master/merged-inventory-dossier.service.ts
@@ -0,0 +1,165 @@
+import { Injectable } from '@nestjs/common';
+import { AssetsService } from './assets.service';
+import { InventoryMergeService } from './inventory-merge.service';
+
+type LooseRecord = Record<string, any>;
+
+function dedupeById<T extends LooseRecord>(items: T[]): T[] {
+  const seen = new Set<string>();
+  const result: T[] = [];
+  for (const item of items) {
+    const id = String(item.id ?? '');
+    if (!id || seen.has(id)) continue;
+    seen.add(id);
+    result.push(item);
+  }
+  return result;
+}
+
+function sortDesc(items: LooseRecord[], fieldCandidates: string[]): LooseRecord[] {
+  return [...items].sort((a, b) => {
+    const first = fieldCandidates.map((field) => b[field]).find(Boolean) ?? 0;
+    const second = fieldCandidates.map((field) => a[field]).find(Boolean) ?? 0;
+    return new Date(String(first)).getTime() - new Date(String(second)).getTime();
+  });
+}
+
+@Injectable()
+export class MergedInventoryDossierService {
+  constructor(
+    private readonly assets: AssetsService,
+    private readonly merges: InventoryMergeService,
+  ) {}
+
+  async dossier(requestedAssetId: string): Promise<Record<string, unknown>> {
+    const mergeStatus = await this.merges.status(requestedAssetId) as LooseRecord;
+    const canonical = mergeStatus.canonical as LooseRecord;
+    const requested = mergeStatus.requested as LooseRecord;
+    const aliases = (mergeStatus.aliases ?? []) as LooseRecord[];
+    const inventoryIds = [canonical.id, ...aliases.map((alias) => alias.id)]
+      .filter(Boolean)
+      .map(String)
+      .filter((value, index, all) => all.indexOf(value) === index);
+
+    const dossiers = await Promise.all(inventoryIds.map(async (assetId) => {
+      const dossier = await this.assets.dossier(assetId) as LooseRecord;
+      const identity = dossier.asset as LooseRecord;
+      return { assetId, identity, dossier };
+    }));
+
+    const enrich = (entry: LooseRecord, identity: LooseRecord): LooseRecord => ({
+      ...entry,
+      historicalInventory: {
+        id: identity.id,
+        code: identity.code,
+        name: identity.name,
+        commonName: identity.commonName ?? null,
+        isCanonical: identity.id === canonical.id,
+      },
+    });
+
+    const collect = (key: string): LooseRecord[] => dedupeById(
+      dossiers.flatMap(({ identity, dossier }) =>
+        ((dossier[key] ?? []) as LooseRecord[]).map((entry) => enrich(entry, identity)),
+      ),
+    );
+
+    const visits = sortDesc(collect('visits'), ['actualStartedAt', 'plannedStartAt', 'createdAt']);
+    const acts = sortDesc(collect('acts'), ['occurredAt', 'createdAt']);
+    const findings = sortDesc(collect('findings'), ['createdAt', 'updatedAt']);
+    const evidence = sortDesc(collect('evidence'), ['capturedAt', 'createdAt']);
+    const communications = sortDesc(collect('communications'), ['occurredAt', 'createdAt']);
+    const verificationResults = sortDesc(collect('verificationResults'), ['verifiedAt', 'resultRecordedAt']);
+    const documents = sortDesc(collect('documents'), ['documentDate', 'linkedAt']);
+    const inspectionReports = sortDesc(collect('inspectionReports'), ['generatedAt']);
+    const media = sortDesc(collect('media'), ['capturedAt', 'createdAt']);
+    const versions = sortDesc(collect('versions'), ['occurredAt']);
+
+    const timeline = dedupeById(
+      dossiers.flatMap(({ identity, dossier }) =>
+        ((dossier.timeline ?? []) as LooseRecord[]).map((event) => ({
+          ...event,
+          meta: {
+            ...(event.meta ?? {}),
+            historicalInventory: {
+              id: identity.id,
+              code: identity.code,
+              name: identity.name,
+              isCanonical: identity.id === canonical.id,
+            },
+          },
+        })),
+      ),
+    );
+
+    for (const alias of aliases) {
+      timeline.push({
+        id: `merge:${String(alias.id)}:${String(alias.mergedAt)}`,
+        kind: 'MERGE',
+        occurredAt: alias.mergedAt,
+        title: `Inventario fusionado · ${String(alias.code)}`,
+        description: alias.reason,
+        meta: {
+          sourceAssetId: alias.id,
+          sourceCode: alias.code,
+          sourceName: alias.name,
+          canonicalAssetId: canonical.id,
+          canonicalCode: canonical.code,
+          canonicalName: canonical.name,
+          historyPreserved: true,
+        },
+      });
+    }
+    timeline.sort((a, b) => new Date(String(b.occurredAt ?? 0)).getTime() - new Date(String(a.occurredAt ?? 0)).getTime());
+
+    const reports = documents.filter((document) => document.documentType === 'TECHNICAL_REPORT');
+    const openFindings = findings.filter((finding) => finding.status === 'OPEN').length;
+    const closedFindings = findings.filter((finding) => finding.status === 'CLOSED').length;
+
+    return {
+      asset: {
+        id: canonical.id,
+        code: canonical.code,
+        name: canonical.name,
+        commonName: (dossiers.find((item) => item.assetId === canonical.id)?.identity?.commonName ?? null),
+      },
+      requestedAsset: {
+        id: requested.id,
+        code: requested.code,
+        name: requested.name,
+      },
+      merge: {
+        requestedWasMerged: requested.id !== canonical.id,
+        canonicalAssetId: canonical.id,
+        aliases,
+        chain: mergeStatus.chain ?? [],
+        aggregatedInventoryIds: inventoryIds,
+        historyPolicy: 'CHRONOLOGICAL_AGGREGATION_WITH_ORIGINAL_IDENTITY',
+      },
+      counters: {
+        inspections: visits.length,
+        acts: acts.length,
+        findings: findings.length,
+        verifications: verificationResults.length,
+        openFindings,
+        closedFindings,
+        evidence: evidence.length,
+        documents: documents.length + media.filter((item) => item.kind === 'DOCUMENT').length,
+        photos: evidence.filter((item) => item.kind === 'PHOTO').length + media.filter((item) => item.kind === 'PHOTO').length,
+        reports: reports.length + inspectionReports.length,
+      },
+      visits,
+      acts,
+      findings,
+      evidence,
+      communications,
+      verificationResults,
+      documents,
+      inspectionReports,
+      reports,
+      media,
+      versions,
+      timeline: timeline.slice(0, 1000),
+    };
+  }
+}