Add user persistence

src/main/java/com/litoralregas/backend_gateway/user/UserEntity.java

@@ -1,4 +1,81 @@
 package com.litoralregas.backend_gateway.user;
 
+import com.litoralregas.backend_gateway.client.ClientEntity;
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "users")
 public class UserEntity {
-}
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(optional = false, fetch = FetchType.LAZY)
+    @JoinColumn(name = "client_id", nullable = false)
+    private ClientEntity client;
+
+    @Column(nullable = false, unique = true)
+    private String username;
+
+    @Column(name = "password_hash", nullable = false)
+    private String passwordHash;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private UserRole role;
+
+    @Column(nullable = false)
+    private boolean enabled = true;
+
+    @Column(name = "created_at", nullable = false, insertable = false, updatable = false)
+    private String createdAt;
+
+    public Long getId() {
+        return id;
+    }
+
+    public ClientEntity getClient() {
+        return client;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPasswordHash() {
+        return passwordHash;
+    }
+
+    public UserRole getRole() {
+        return role;
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public String getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setClient(ClientEntity client) {
+        this.client = client;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public void setPasswordHash(String passwordHash) {
+        this.passwordHash = passwordHash;
+    }
+
+    public void setRole(UserRole role) {
+        this.role = role;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+}

src/main/java/com/litoralregas/backend_gateway/user/UserRepository.java

@@ -1,4 +1,10 @@
 package com.litoralregas.backend_gateway.user;
 
-public class UserRepository {
-}
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<UserEntity, Long> {
+
+    Optional<UserEntity> findByUsername(String username);
+}

src/main/java/com/litoralregas/backend_gateway/user/UserRole.java

@@ -0,0 +1,6 @@
+package com.litoralregas.backend_gateway.user;
+
+public enum UserRole {
+    ADMIN,
+    CLIENT_USER
+}

src/main/resources/db/migration/V2__create_users.sql

@@ -0,0 +1,13 @@
+CREATE TABLE users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    client_id INTEGER NOT NULL,
+    username TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL,
+    role TEXT NOT NULL,
+    enabled INTEGER NOT NULL DEFAULT 1,
+    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT fk_users_client
+        FOREIGN KEY (client_id)
+        REFERENCES clients(id)
+);