Make repository structure for backend.

backend/src/main/java/com/egor/rssaggregator/dto/input/AddFeedDto.java

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+package com.egor.rssaggregator.dto.input;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class AddFeedDto {
+    @NotBlank
+    @Size(max = 50)
+    private String name;
+
+    @NotBlank
+    @Size(max = 250)
+    private String url;
+}

backend/src/main/java/com/egor/rssaggregator/dto/input/LoginDto.java

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+package com.egor.rssaggregator.dto.input;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class LoginDto {
+    @NotBlank
+    @Size(max = 50)
+    private String email;
+
+    @NotBlank
+    @Size(max = 32)
+    private String password;
+}

backend/src/main/java/com/egor/rssaggregator/dto/input/RegDto.java

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+package com.egor.rssaggregator.dto.input;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class RegDto {
+    @NotBlank
+    @Size(max = 50)
+    private String email;
+
+    @NotBlank
+    @Size(max = 32)
+    private String password;
+}

backend/src/main/java/com/egor/rssaggregator/dto/output/GetFeedDto.java

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+package com.egor.rssaggregator.dto.output;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class GetFeedDto {
+    @NotBlank
+    @Size(max = 50)
+    private String name;
+
+    @NotBlank
+    @Size(max = 250)
+    private String url;
+}

backend/src/main/java/com/egor/rssaggregator/dto/output/MainNewsEntryDto.java

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+package com.egor.rssaggregator.dto.output;
+
+import com.egor.rssaggregator.entity.Feed;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+import java.time.LocalDate;
+
+@Data
+@Builder
+public class MainNewsEntryDto {
+    @NotBlank
+    @Size(max = 100)
+    private String newsHead;
+
+    @NotNull
+    private LocalDate newsDate;
+
+    @NotNull
+    private Feed source;
+}

backend/src/main/java/com/egor/rssaggregator/dto/output/MoreTextNewsEntryDto.java

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+package com.egor.rssaggregator.dto.output;
+
+import com.egor.rssaggregator.entity.Feed;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import lombok.Builder;
+import lombok.Data;
+
+import java.time.LocalDate;
+
+@Data
+@Builder
+public class MoreTextNewsEntryDto {
+    @NotBlank
+    @Size(max = 100)
+    private String newsHead;
+
+    @NotNull
+    private LocalDate newsDate;
+
+    private String newsText;
+
+    @NotNull
+    private Feed source;
+}

backend/src/main/java/com/egor/rssaggregator/entity/Feed.java

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+package com.egor.rssaggregator.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.proxy.HibernateProxy;
+
+import java.util.Objects;
+
+@Entity
+@Table(name = "feeds")
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class Feed {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id", nullable = false)
+    private Long id;
+
+    @Column(name = "name", unique = true, length = 50, nullable = false)
+    private String name;
+
+    @Column(name = "url", unique = true, length = 250, nullable = false)
+    private String url;
+
+    @ManyToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Override
+    public final boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null) return false;
+        Class<?> oEffectiveClass = o instanceof HibernateProxy ? ((HibernateProxy) o).getHibernateLazyInitializer().getPersistentClass() : o.getClass();
+        Class<?> thisEffectiveClass = this instanceof HibernateProxy ? ((HibernateProxy) this).getHibernateLazyInitializer().getPersistentClass() : this.getClass();
+        if (thisEffectiveClass != oEffectiveClass) return false;
+        Feed feed = (Feed) o;
+        return getId() != null && Objects.equals(getId(), feed.getId());
+    }
+
+    @Override
+    public final int hashCode() {
+        return this instanceof HibernateProxy ? ((HibernateProxy) this).getHibernateLazyInitializer().getPersistentClass().hashCode() : getClass().hashCode();
+    }
+}

backend/src/main/java/com/egor/rssaggregator/entity/News.java

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+package com.egor.rssaggregator.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+
+import java.time.LocalDate;
+import java.util.Objects;
+
+@Entity
+@Table(name = "news")
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class News {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id", nullable = false)
+    private Long id;
+
+    @Column(name = "newsHead", length = 100, nullable = false)
+    private String newsHead;
+
+    @Column(name = "newsDate", nullable = false)
+    private LocalDate newsDate;
+
+    @Column(name = "newsText")
+    @Lob
+    private String newsText;
+
+    @ToString.Exclude
+    @ManyToOne(cascade = CascadeType.ALL)
+    @JoinColumn(name = "feed_id")
+    private Feed feed;
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        News news = (News) o;
+        return Objects.equals(id, news.id) &&
+                Objects.equals(newsHead, news.newsHead) &&
+                Objects.equals(newsDate, news.newsDate) &&
+                Objects.equals(feed, news.feed);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, newsHead, newsDate, feed);
+    }
+}

backend/src/main/java/com/egor/rssaggregator/entity/User.java

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+package com.egor.rssaggregator.entity;
+
+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.*;
+
+@Entity
+@Table(name = "users")
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class User implements UserDetails {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id", nullable = false)
+    private Long id;
+
+    @Column(name = "email", unique = true, length = 50, nullable = false)
+    private String email;
+
+    @Column(name = "password", length = 120, nullable = false)
+    @ToString.Exclude
+    private String password;
+
+    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
+    @ToString.Exclude
+    private List<Feed> feeds = new ArrayList<>();
+
+    @Override
+    public Collection<? extends GrantedAuthority> getAuthorities() {
+        var userRole = new HashSet<SimpleGrantedAuthority>();
+        userRole.add(new SimpleGrantedAuthority("ROLE_USER")); // all users are users, not admins
+        return userRole;
+    }
+
+    @Override
+    public String getUsername() {
+        return email;
+    }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return true;
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return true;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        User user = (User) o;
+        return Objects.equals(id, user.id) &&
+                Objects.equals(email, user.email) &&
+                Objects.equals(password, user.password) &&
+                Objects.equals(feeds, user.feeds);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, email, password, feeds);
+    }
+}

backend/src/main/java/com/egor/rssaggregator/repo/FeedRepo.java

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+package com.egor.rssaggregator.repo;
+
+import com.egor.rssaggregator.entity.Feed;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface FeedRepo extends JpaRepository<Feed, Long> {
+    Optional<Feed> findById(long id);
+}

backend/src/main/java/com/egor/rssaggregator/repo/NewsRepo.java

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+package com.egor.rssaggregator.repo;
+
+import com.egor.rssaggregator.entity.News;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface NewsRepo extends JpaRepository<News, Long> {
+    Optional<News> findById(long id);
+}

backend/src/main/java/com/egor/rssaggregator/repo/UserRepo.java

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+package com.egor.rssaggregator.repo;
+
+import com.egor.rssaggregator.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepo extends JpaRepository<User, Long> {
+    Optional<User> findByEmail(String email);
+
+    Optional<User> findById(long id);
+}

backend/src/main/java/com/egor/rssaggregator/service/FeedService.java

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+package com.egor.rssaggregator.service;
+
+public interface FeedService {
+}

backend/src/main/java/com/egor/rssaggregator/service/UserService.java

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+package com.egor.rssaggregator.service;
+
+public interface UserService {
+}

backend/src/main/java/com/egor/rssaggregator/service/impl/FeedServiceImpl.java

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+package com.egor.rssaggregator.service.impl;
+
+import com.egor.rssaggregator.service.FeedService;
+
+public class FeedServiceImpl implements FeedService {
+}

backend/src/main/java/com/egor/rssaggregator/service/impl/UserServiceImpl.java

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+package com.egor.rssaggregator.service.impl;
+
+import com.egor.rssaggregator.service.UserService;
+
+public class UserServiceImpl implements UserService {
+}