레이어 관리 api 추가

src/main/java/com/kamco/cd/kamcoback/postgres/entity/MapLayerEntity.java

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+package com.kamco.cd.kamcoback.postgres.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import java.math.BigDecimal;
+import java.time.Instant;
+import java.util.Map;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.ColumnDefault;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.type.SqlTypes;
+
+@Getter
+@Setter
+@Entity
+@Table(name = "tb_map_layer")
+public class MapLayerEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "tb_map_layer_id_gen")
+  @SequenceGenerator(
+      name = "tb_map_layer_id_gen",
+      sequenceName = "tb_map_layer_seq",
+      allocationSize = 1)
+  @Column(name = "id", nullable = false)
+  private Long id;
+
+  @Size(max = 20)
+  @NotNull
+  @Column(name = "layer_type", nullable = false, length = 20)
+  private String layerType;
+
+  @Size(max = 200)
+  @Column(name = "title", length = 200)
+  private String title;
+
+  @Column(name = "description", length = Integer.MAX_VALUE)
+  private String description;
+
+  @Column(name = "url", length = Integer.MAX_VALUE)
+  private String url;
+
+  @Column(name = "min_lon", precision = 10, scale = 7)
+  private BigDecimal minLon;
+
+  @Column(name = "min_lat", precision = 10, scale = 7)
+  private BigDecimal minLat;
+
+  @Column(name = "max_lon", precision = 10, scale = 7)
+  private BigDecimal maxLon;
+
+  @Column(name = "max_lat", precision = 10, scale = 7)
+  private BigDecimal maxLat;
+
+  @Column(name = "min_zoom")
+  private Short minZoom;
+
+  @Column(name = "max_zoom")
+  private Short maxZoom;
+
+  @Column(name = "raw_json")
+  @JdbcTypeCode(SqlTypes.JSON)
+  private Map<String, Object> rawJson;
+
+  @NotNull
+  @ColumnDefault("now()")
+  @Column(name = "created_at", nullable = false)
+  private Instant createdAt;
+
+  @Column(name = "updated_at")
+  private Instant updatedAt;
+}

src/main/java/com/kamco/cd/kamcoback/postgres/repository/layer/LayerRepository.java

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+package com.kamco.cd.kamcoback.postgres.repository.layer;
+
+import com.kamco.cd.kamcoback.postgres.entity.MapLayerEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface LayerRepository
+    extends JpaRepository<MapLayerEntity, Long>, LayerRepositoryCustom {}

src/main/java/com/kamco/cd/kamcoback/postgres/repository/layer/LayerRepositoryCustom.java

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+package com.kamco.cd.kamcoback.postgres.repository.layer;
+
+public interface LayerRepositoryCustom {}

src/main/java/com/kamco/cd/kamcoback/postgres/repository/layer/LayerRepositoryImpl.java

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+package com.kamco.cd.kamcoback.postgres.repository.layer;
+
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class LayerRepositoryImpl implements LayerRepositoryCustom {}