diff --git a/api-v3/src/inspection-visits/f4-inspection-visits.service.ts b/api-v3/src/inspection-visits/f4-inspection-visits.service.ts
new file mode 100644
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+++ b/api-v3/src/inspection-visits/f4-inspection-visits.service.ts
@@ -0,0 +1,152 @@
+import { Injectable } from '@nestjs/common';
+import { DataSource } from 'typeorm';
+import { AuditService } from '../audit/audit.service';
+import type { AuthPrincipal, RequestWithContext } from '../common/http/request-context';
+import type { CreateInspectionVisitDto } from './dto/create-inspection-visit.dto';
+import type { ListInspectionVisitsQueryDto } from './dto/list-inspection-visits-query.dto';
+import type { InspectionVisitView } from './inspection-visits.service';
+import { InspectionVisitsService } from './inspection-visits.service';
+
+/**
+ * Capa activa F4 sobre el servicio histórico de Inspecciones.
+ *
+ * Mantiene las operaciones de planificación/equipo/Inventario ya probadas, pero
+ * elimina de la salida funcional los conceptos retirados en F4:
+ * - no existe un título de negocio independiente del código institucional;
+ * - no existe fecha prevista de fin;
+ * - el checklist es exclusivamente técnico y nunca depende de respuestas de empresa.
+ *
+ * Las columnas legacy permanecen temporalmente en PostgreSQL para una migración de
+ * limpieza posterior a la validación del piloto, sin intervenir datos históricos a ciegas.
+ */
+@Injectable()
+export class F4InspectionVisitsService extends InspectionVisitsService {
+  constructor(
+    private readonly f4DataSource: DataSource,
+    audit: AuditService,
+  ) {
+    super(f4DataSource, audit);
+  }
+
+  override async list(query: ListInspectionVisitsQueryDto) {
+    const response = await super.list(query);
+    return {
+      ...response,
+      data: response.data.map((visit) => this.normalizeVisit(visit)),
+    };
+  }
+
+  override async getById(id: string): Promise<InspectionVisitView> {
+    await this.reclassifyCurrentChecklist(id);
+    return this.normalizeVisit(await super.getById(id));
+  }
+
+  override async create(
+    dto: CreateInspectionVisitDto,
+    principal: AuthPrincipal,
+    request: RequestWithContext,
+  ): Promise<InspectionVisitView> {
+    const created = await super.create(dto, principal, request);
+    await this.reclassifyCurrentChecklist(created.id);
+    return this.normalizeVisit(await super.getById(created.id));
+  }
+
+  override async generateChecklist(
+    id: string,
+    principal: AuthPrincipal,
+    request: RequestWithContext,
+  ): Promise<InspectionVisitView> {
+    await super.generateChecklist(id, principal, request);
+    await this.reclassifyCurrentChecklist(id);
+    return this.normalizeVisit(await super.getById(id));
+  }
+
+  private normalizeVisit<T extends { code: string; title: string; plannedEndAt: Date | null }>(visit: T): T {
+    const normalized = {
+      ...visit,
+      // Compatibilidad de contrato: consumidores antiguos reciben el identificador,
+      // no un segundo nombre persistente que pueda divergir.
+      title: visit.code,
+      plannedEndAt: null,
+    } as T;
+
+    if ('checklist' in normalized) {
+      const view = normalized as T & InspectionVisitView;
+      view.checklist = {
+        ...view.checklist,
+        companyOverdue: 0,
+        items: view.checklist.items.filter((item) => item.itemKind !== 'COMPANY_OVERDUE'),
+      };
+    }
+    return normalized;
+  }
+
+  private async reclassifyCurrentChecklist(visitId: string): Promise<void> {
+    await this.f4DataSource.transaction(async (manager) => {
+      const [visit] = await manager.query(`
+        SELECT checklist_generation AS generation, planned_start_at AS "plannedStartAt"
+        FROM inspection_visits
+        WHERE id=$1
+        FOR UPDATE
+      `, [visitId]) as Array<{ generation: number; plannedStartAt: Date | null }>;
+      if (!visit || Number(visit.generation) < 1 || !visit.plannedStartAt) return;
+
+      const targetDate = new Date(visit.plannedStartAt).toISOString().slice(0, 10);
+      await manager.query(`
+        UPDATE inspection_visit_checklist_items item
+        SET
+          item_kind = CASE
+            WHEN finding.status='OPEN'
+              AND finding.next_control_on IS NOT NULL
+              AND finding.next_control_on < $3::date
+              AND COALESCE((
+                SELECT verification.outcome
+                FROM inspection_finding_verification_visits verification
+                WHERE verification.finding_id=finding.id
+                  AND verification.outcome IS NOT NULL
+                ORDER BY verification.result_recorded_at DESC NULLS LAST,
+                         verification.created_at DESC,
+                         verification.id DESC
+                LIMIT 1
+              ), '') <> 'RESOLVED'
+              THEN 'VERIFICATION_OVERDUE'
+            WHEN finding.status='OPEN'
+              AND finding.next_control_on IS NOT NULL
+              AND finding.next_control_on BETWEEN $3::date AND ($3::date + 30)
+              AND COALESCE((
+                SELECT verification.outcome
+                FROM inspection_finding_verification_visits verification
+                WHERE verification.finding_id=finding.id
+                  AND verification.outcome IS NOT NULL
+                ORDER BY verification.result_recorded_at DESC NULLS LAST,
+                         verification.created_at DESC,
+                         verification.id DESC
+                LIMIT 1
+              ), '') <> 'RESOLVED'
+              THEN 'UPCOMING_CONTROL'
+            ELSE 'ANTECEDENT'
+          END,
+          reference_on = CASE
+            WHEN finding.status='OPEN'
+              AND finding.next_control_on IS NOT NULL
+              AND COALESCE((
+                SELECT verification.outcome
+                FROM inspection_finding_verification_visits verification
+                WHERE verification.finding_id=finding.id
+                  AND verification.outcome IS NOT NULL
+                ORDER BY verification.result_recorded_at DESC NULLS LAST,
+                         verification.created_at DESC,
+                         verification.id DESC
+                LIMIT 1
+              ), '') <> 'RESOLVED'
+              THEN finding.next_control_on
+            ELSE NULL
+          END
+        FROM inspection_findings finding
+        WHERE item.visit_id=$1
+          AND item.generation_number=$2
+          AND finding.id=item.finding_id
+      `, [visitId, visit.generation, targetDate]);
+    });
+  }
+}