[Bug] Pessoal, estou tendo problemas para fazer um relacionamento

Bom dia, tudo bem pessoal? Eu estou tendo um problema para gerar o relacionamento entre duas tabelas no migrations, eu já tentei alterar de várias formas, inclusive ler a documentação, porém não consigo chegar na solução, pois sempre chego a outro erro. Podem me ajudar?

Erro: could not execute statement [Field 'user_id' doesn't have a default value] [insert into TB_USERS (full_name,user_password,user_name) values (?,?,?)]

Entitys

package com.igaopk.med.MedicineApi.users.entitys;

import jakarta.persistence.*;
import lombok.*;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Collection;
import java.util.List;

@Table(name = "TB_USERS", schema = "public")
@Entity
@Data
@EqualsAndHashCode(of = "id")
public class User implements UserDetails {

    @Id
    @Column(name = "user_id", unique = true)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "full_name")
    private String fullName;

    @Column(name = "user_name", unique = true)
    private String userName;

    @Column(name = "user_password")
    private String password;

    @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
    @JoinColumn(name = "user_id")
    private List<CellPhone> cellPhones;

    public User (){

    }

    public User(String fullName, String userName, String password, List<CellPhone> cellPhones) {
        this.fullName = fullName;
        this.userName = userName;
        this.password = password;
        this.cellPhones = cellPhones;
    }

    public void update(String fullName, String userName, String password, List<CellPhone> cellPhones) {
        if (!fullName.isBlank()) {
            this.fullName = fullName;
        }

        if (!userName.isBlank() || userName.length() < 4) {
            this.userName = userName;
        }

        if (!password.isBlank() || password.length() < 4) {
            this.password = password;

        }

        this.cellPhones = cellPhones;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return List.of(new SimpleGrantedAuthority("ROLE_USER"));
    }

    public String getPassword() {
        return password;
    }

    @Override
    public String getUsername() {
        return this.userName;
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

package com.igaopk.med.MedicineApi.users.entitys;

import jakarta.persistence.*;
import lombok.Data;

import java.io.Serializable;

@Entity
@Table(name = "TB_CELLPHONES")
@Data
public class CellPhone implements Serializable {

    @Id
    @Column(name = "phone_id", unique = true)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column(name = "cell_phone")
    private String cellphone;

    @ManyToOne(targetEntity = User.class)
    @JoinColumn(name = "TB_CELLPHONES_fk")
    private int user_id;

    public CellPhone(){}

    public CellPhone(String cellphone) {
        this.cellphone = cellphone;
    }
}

Querys

CREATE TABLE TB_USERS(
    user_id int NOT NULL PRIMARY KEY,
    full_name varchar(255) NOT NULL,
    user_name varchar(50) NOT NULL,
    user_password varchar(100) NOT NULL
);

CREATE TABLE TB_CELLPHONES(
    phone_id int NOT NULL PRIMARY KEY,
    cell_phone MEDIUMTEXT NOT NULL,
    user_id int,

   CONSTRAINT TB_CELLPHONES_fk FOREIGN KEY (user_id) REFERENCES TB_USERS(user_id)
);