Add user models

src/main/java/ru/ulstu/fc/core/model/User.java

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+package ru.ulstu.fc.core.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinTable;
+import jakarta.persistence.ManyToMany;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+import ru.ulstu.fc.config.Constants;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name = "is_users")
+public class User extends BaseEntity {
+    @NotNull
+    @Pattern(regexp = Constants.LOGIN_REGEX)
+    @Size(min = 1, max = 50)
+    @Column(length = 50, unique = true, nullable = false)
+    private String login;
+
+    @NotNull
+    @Size(min = 60, max = 60)
+    @Column(name = "password_hash", length = 60, nullable = false)
+    private String password;
+
+    @ManyToMany
+    @JoinTable(
+            name = "is_user_role",
+            joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
+            inverseJoinColumns = {@JoinColumn(name = "user_role_name", referencedColumnName = "name")})
+    private Set<UserRole> roles;
+
+    public User() {
+        roles = new HashSet<>();
+    }
+
+    public User(String login, String password, Set<UserRole> roles) {
+        this.login = login;
+        this.password = password;
+        this.roles = roles;
+    }
+
+    public String getLogin() {
+        return login;
+    }
+
+    public void setLogin(String login) {
+        this.login = login.toLowerCase();
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public Set<UserRole> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(Set<UserRole> roles) {
+        this.roles = roles;
+    }
+}

src/main/java/ru/ulstu/fc/core/model/UserRole.java

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+package ru.ulstu.fc.core.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+
+@Entity
+@Table(name = "is_user_roles")
+public class UserRole {
+    @Id
+    @NotNull
+    @Size(max = 50)
+    @Column(length = 50, nullable = false)
+    private String name;
+
+    public UserRole() {
+    }
+
+    public UserRole(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        UserRole role = (UserRole) o;
+        return !(name != null ? !name.equals(role.name) : role.name != null);
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return name != null ? name.hashCode() : 0;
+    }
+}

src/main/java/ru/ulstu/fc/core/model/UserRoleConstants.java

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+package ru.ulstu.fc.core.model;
+
+public class UserRoleConstants {
+    public static final String ADMIN = "ROLE_ADMIN";
+    public static final String USER = "ROLE_USER";
+}