Add global image tags and tag assignment

src/main/kotlin/com/android/trisolarisserver/models/room/RoomImage.kt

@@ -39,13 +39,13 @@ class RoomImage(
     @Column(name = "room_type_code")
     var roomTypeCode: String? = null,
 
-    @ElementCollection(fetch = FetchType.EAGER)
-    @CollectionTable(
-        name = "room_image_tag",
-        joinColumns = [JoinColumn(name = "room_image_id")]
+    @ManyToMany(fetch = FetchType.LAZY)
+    @JoinTable(
+        name = "room_image_tag_link",
+        joinColumns = [JoinColumn(name = "room_image_id")],
+        inverseJoinColumns = [JoinColumn(name = "tag_id")]
     )
-    @Column(name = "tag", nullable = false)
-    var tags: MutableSet<String> = mutableSetOf(),
+    var tags: MutableSet<RoomImageTag> = mutableSetOf(),
 
     @Column(name = "sort_order")
     var roomSortOrder: Int = 0,

src/main/kotlin/com/android/trisolarisserver/models/room/RoomImageTag.kt

@@ -0,0 +1,28 @@
+package com.android.trisolarisserver.models.room
+
+import jakarta.persistence.Column
+import jakarta.persistence.Entity
+import jakarta.persistence.GeneratedValue
+import jakarta.persistence.Id
+import jakarta.persistence.Table
+import jakarta.persistence.UniqueConstraint
+import java.time.OffsetDateTime
+import java.util.UUID
+
+@Entity
+@Table(
+    name = "room_image_tag",
+    uniqueConstraints = [UniqueConstraint(columnNames = ["name"])]
+)
+class RoomImageTag(
+    @Id
+    @GeneratedValue
+    @Column(columnDefinition = "uuid")
+    val id: UUID? = null,
+
+    @Column(nullable = false)
+    var name: String,
+
+    @Column(name = "created_at", nullable = false, columnDefinition = "timestamptz")
+    val createdAt: OffsetDateTime = OffsetDateTime.now()
+)