feat: add reservation entity, status, and repository

src/main/java/com/slotline/reservation/Reservation.java

@@ -0,0 +1,116 @@
+package com.slotline.reservation;
+
+import com.slotline.resource.Resource;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.Version;
+
+import java.time.Instant;
+
+@Entity
+@Table(name = "reservation")
+public class Reservation {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(name = "resource_id", nullable = false)
+    private Resource resource;
+
+    @Column(name = "organization_id", nullable = false)
+    private Long organizationId;
+
+    @Column(name = "series_id", length = 36)
+    private String seriesId;
+
+    @Column(name = "user_id", nullable = false)
+    private Long userId;
+
+    @Column(name = "start_time", nullable = false)
+    private Instant startTime;
+
+    @Column(name = "end_time", nullable = false)
+    private Instant endTime;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false, length = 16)
+    private ReservationStatus status;
+
+    @Column(name = "created_at", nullable = false)
+    private Instant createdAt;
+
+    @Version
+    private Long version;
+
+    protected Reservation() {
+    }
+
+    public Reservation(Resource resource, Long userId, Instant startTime, Instant endTime, Instant createdAt) {
+        this.resource = resource;
+        this.organizationId = resource.getOrganizationId();
+        this.userId = userId;
+        this.startTime = startTime;
+        this.endTime = endTime;
+        this.status = ReservationStatus.ACTIVE;
+        this.createdAt = createdAt;
+    }
+
+    public void cancel() {
+        this.status = ReservationStatus.CANCELLED;
+    }
+
+    public void assignSeries(String seriesId) {
+        this.seriesId = seriesId;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public Resource getResource() {
+        return resource;
+    }
+
+    public Long getOrganizationId() {
+        return organizationId;
+    }
+
+    public String getSeriesId() {
+        return seriesId;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public Instant getStartTime() {
+        return startTime;
+    }
+
+    public Instant getEndTime() {
+        return endTime;
+    }
+
+    public ReservationStatus getStatus() {
+        return status;
+    }
+
+    public Instant getCreatedAt() {
+        return createdAt;
+    }
+
+    public Long getVersion() {
+        return version;
+    }
+}

src/main/java/com/slotline/reservation/ReservationRepository.java

@@ -0,0 +1,55 @@
+package com.slotline.reservation;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.time.Instant;
+import java.util.List;
+
+public interface ReservationRepository extends JpaRepository<Reservation, Long> {
+
+    List<Reservation> findByUserIdOrderByStartTimeDesc(Long userId);
+
+    List<Reservation> findByResourceIdAndStatusOrderByStartTimeAsc(Long resourceId, ReservationStatus status);
+
+    List<Reservation> findByResourceIdOrderByStartTimeAsc(Long resourceId);
+
+    List<Reservation> findByUserIdAndStatusOrderByStartTimeAsc(Long userId, ReservationStatus status);
+
+    List<Reservation> findBySeriesIdOrderByStartTimeAsc(String seriesId);
+
+    @Query("""
+            select r from Reservation r
+            where r.resource.id = :resourceId
+              and r.status = com.slotline.reservation.ReservationStatus.ACTIVE
+              and r.startTime < :end
+              and r.endTime > :start
+            """)
+    List<Reservation> findActiveOverlaps(@Param("resourceId") Long resourceId,
+                                         @Param("start") Instant start,
+                                         @Param("end") Instant end);
+
+    @Query("""
+            select r from Reservation r
+            where r.resource.id = :resourceId
+              and r.status = com.slotline.reservation.ReservationStatus.ACTIVE
+              and r.startTime < :until
+              and r.endTime > :from
+            """)
+    List<Reservation> findActiveWithinWindow(@Param("resourceId") Long resourceId,
+                                             @Param("from") Instant from,
+                                             @Param("until") Instant until);
+
+    @Query("""
+            select r from Reservation r
+            where r.resource.id = :resourceId
+              and r.status = com.slotline.reservation.ReservationStatus.ACTIVE
+              and r.startTime < :until
+              and r.endTime > :from
+            order by r.startTime asc
+            """)
+    List<Reservation> findActiveForResourceBetween(@Param("resourceId") Long resourceId,
+                                                    @Param("from") Instant from,
+                                                    @Param("until") Instant until);
+}

src/main/java/com/slotline/reservation/ReservationStatus.java

@@ -0,0 +1,6 @@
+package com.slotline.reservation;
+
+public enum ReservationStatus {
+    ACTIVE,
+    CANCELLED
+}