feat: Postのidが同じ時、上書きするように

src/main/kotlin/dev/usbharu/hideout/repository/PostRepositoryImpl.kt

@@ -29,6 +29,8 @@ class PostRepositoryImpl(database: Database, private val idGenerateService: IdGe
 
     override suspend fun save(post: Post): Post {
         return query {
+            val singleOrNull = Posts.select { Posts.id eq post.id }.singleOrNull()
+            if (singleOrNull == null) {
                 Posts.insert {
                     it[id] = post.id
                     it[userId] = post.userId
@@ -42,6 +44,20 @@ class PostRepositoryImpl(database: Database, private val idGenerateService: IdGe
                     it[sensitive] = post.sensitive
                     it[apId] = post.apId
                 }
+            } else {
+                Posts.update({ Posts.id eq post.id }) {
+                    it[userId] = post.userId
+                    it[overview] = post.overview
+                    it[text] = post.text
+                    it[createdAt] = post.createdAt
+                    it[visibility] = post.visibility.ordinal
+                    it[url] = post.url
+                    it[repostId] = post.repostId
+                    it[replyId] = post.replyId
+                    it[sensitive] = post.sensitive
+                    it[apId] = post.apId
+                }
+            }
             return@query post
         }
     }