diff --git a/api-v3/src/database/migrations/1789844800000-phase-f3-1-other-inventory-families.ts b/api-v3/src/database/migrations/1789844800000-phase-f3-1-other-inventory-families.ts
new file mode 100644
index 0000000..93c98e0
--- /dev/null
+++ b/api-v3/src/database/migrations/1789844800000-phase-f3-1-other-inventory-families.ts
@@ -0,0 +1,102 @@
+import { createHash } from 'node:crypto';
+import { MigrationInterface, QueryRunner } from 'typeorm';
+import {
+  F31_INSTALLATION_FAMILIES,
+  F31_UNIVERSAL_FINDINGS,
+} from '../../reference-data/f3-1-inventory-excel';
+
+const INSTALLATION_OTHER_CODE = 'F31-INST-OTRO';
+
+function subOtherCode(parentCode: string): string {
+  return `F31-SUB-OTRO-${createHash('sha1').update(parentCode).digest('hex').slice(0, 12).toUpperCase()}`;
+}
+
+export class PhaseF31OtherInventoryFamilies1789844800000 implements MigrationInterface {
+  name = 'PhaseF31OtherInventoryFamilies1789844800000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      INSERT INTO inventory_families(
+        code,name,level,legacy_type_code,information_labels,source_reference,is_active
+      ) VALUES ($1::varchar,'Otro / no catalogado','INSTALLATION',NULL,'[]'::jsonb,
+        'SYSTEM:F3.1:OTHER',true)
+      ON CONFLICT (code) DO UPDATE SET
+        name=EXCLUDED.name,is_active=true,updated_at=CURRENT_TIMESTAMP
+    `, [INSTALLATION_OTHER_CODE]);
+
+    for (const parent of F31_INSTALLATION_FAMILIES) {
+      const code = subOtherCode(parent.code);
+      await queryRunner.query(`
+        INSERT INTO inventory_families(
+          code,name,level,legacy_type_code,information_labels,source_reference,is_active
+        ) VALUES ($1::varchar,'Otro / no catalogado','SUBINSTALLATION',NULL,'[]'::jsonb,
+          $2::varchar,true)
+        ON CONFLICT (code) DO UPDATE SET
+          name=EXCLUDED.name,is_active=true,updated_at=CURRENT_TIMESTAMP
+      `, [code, `SYSTEM:F3.1:OTHER:${parent.code}`]);
+      await queryRunner.query(`
+        INSERT INTO inventory_family_parent_rules(child_family_id,parent_family_id)
+        SELECT child.id,parent.id
+        FROM inventory_families child
+        JOIN inventory_families parent ON parent.code=$2::varchar
+        WHERE child.code=$1::varchar
+        ON CONFLICT (child_family_id) DO UPDATE
+        SET parent_family_id=EXCLUDED.parent_family_id
+      `, [code, parent.code]);
+    }
+
+    // Si la Instalación misma es "Otro", también necesita una opción "Otro" hija.
+    const rootSubOther = subOtherCode(INSTALLATION_OTHER_CODE);
+    await queryRunner.query(`
+      INSERT INTO inventory_families(
+        code,name,level,legacy_type_code,information_labels,source_reference,is_active
+      ) VALUES ($1::varchar,'Otro / no catalogado','SUBINSTALLATION',NULL,'[]'::jsonb,
+        'SYSTEM:F3.1:OTHER:F31-INST-OTRO',true)
+      ON CONFLICT (code) DO UPDATE SET
+        name=EXCLUDED.name,is_active=true,updated_at=CURRENT_TIMESTAMP
+    `, [rootSubOther]);
+    await queryRunner.query(`
+      INSERT INTO inventory_family_parent_rules(child_family_id,parent_family_id)
+      SELECT child.id,parent.id
+      FROM inventory_families child
+      JOIN inventory_families parent ON parent.code=$2::varchar
+      WHERE child.code=$1::varchar
+      ON CONFLICT (child_family_id) DO UPDATE
+      SET parent_family_id=EXCLUDED.parent_family_id
+    `, [rootSubOther, INSTALLATION_OTHER_CODE]);
+
+    const otherCodes = [
+      INSTALLATION_OTHER_CODE,
+      ...F31_INSTALLATION_FAMILIES.map((parent) => subOtherCode(parent.code)),
+      rootSubOther,
+    ];
+    for (const familyCode of otherCodes) {
+      for (const title of F31_UNIVERSAL_FINDINGS) {
+        await queryRunner.query(`
+          INSERT INTO finding_catalog_item_inventory_families(catalog_item_id,inventory_family_id)
+          SELECT item.id,family.id
+          FROM finding_catalog_items item
+          JOIN finding_categories category ON category.id=item.category_id
+          CROSS JOIN inventory_families family
+          WHERE lower(category.code)='app26r2'
+            AND lower(btrim(item.title))=lower(btrim($2::text))
+            AND family.code=$1::varchar
+          ON CONFLICT (catalog_item_id,inventory_family_id) DO NOTHING
+        `, [familyCode, title]);
+      }
+    }
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    const codes = [
+      INSTALLATION_OTHER_CODE,
+      ...F31_INSTALLATION_FAMILIES.map((parent) => subOtherCode(parent.code)),
+      subOtherCode(INSTALLATION_OTHER_CODE),
+    ];
+    await queryRunner.query(`
+      DELETE FROM inventory_families
+      WHERE code=ANY($1::varchar[])
+        AND NOT EXISTS (SELECT 1 FROM assets asset WHERE asset.inventory_family_id=inventory_families.id)
+    `, [codes]);
+  }
+}