movidos los ficheros por funciones

src/main/java/com/imprimelibros/erp/configurationERP/Variable.java

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+package com.imprimelibros.erp.configurationERP;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "variables")
+public class Variable {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String clave;
+
+    private String valor;
+
+    // Getters y setters
+
+    public Long getId() { return id; }
+
+    public void setId(Long id) { this.id = id; }
+
+    public String getClave() { return clave; }
+
+    public void setClave(String clave) { this.clave = clave; }
+
+    public String getValor() { return valor; }
+
+    public void setValor(String valor) { this.valor = valor; }
+}

src/main/java/com/imprimelibros/erp/configurationERP/VariableRepository.java

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+package com.imprimelibros.erp.configurationERP;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface VariableRepository extends JpaRepository<Variable, Long> {
+    Optional<Variable> findByClave(String clave);
+}

src/main/java/com/imprimelibros/erp/configurationERP/VariableService.java

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+package com.imprimelibros.erp.configurationERP;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class VariableService {
+
+    @Autowired
+    private VariableRepository variableRepository;
+
+    public Integer getValorEntero(String clave) {
+        return variableRepository.findByClave(clave)
+                .<Integer>map(v -> Integer.parseInt(v.getValor()))
+                .orElseThrow(
+                        () -> new IllegalArgumentException("No se encontró la variable con clave '" + clave + "'"));
+    }
+
+}