feat: add validation for semantic ID in post and update error handling

backend/Cargo.lock

@@ -2407,6 +2407,7 @@ dependencies = [
  "auth",
  "chrono",
  "common",
+ "regex",
  "sentry",
  "serde",
  "sqlx",
@@ -2638,9 +2639,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.11.1"
+version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+checksum = "4a52d8d02cacdb176ef4678de6c052efb4b3da14b78e4db683a4252762be5433"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -2650,9 +2651,9 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.4.9"
+version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+checksum = "722166aa0d7438abbaa4d5cc2c649dac844e8c56d82fb3d33e9c34b5cd268fc6"
 dependencies = [
  "aho-corasick",
  "memchr",

backend/Cargo.toml

@@ -5,7 +5,6 @@ members = [
     "feature/common",
     "feature/image",
     "feature/post",
-    "feature/common",
 ]
 resolver = "2"
 
@@ -33,6 +32,7 @@ openidconnect = { version = "4.0.1", features = [
     "reqwest-blocking",
 ] }
 percent-encoding = "2.3.1"
+regex = "1.12.1"
 sentry = { version = "0.42.0", features = ["actix", "anyhow"] }
 serde = { version = "1.0.219", features = ["derive"] }
 sqlx = { version = "0.8.5", features = [

backend/feature/post/Cargo.toml

@@ -8,6 +8,7 @@ actix-web.workspace = true
 anyhow.workspace = true
 async-trait.workspace = true
 chrono.workspace = true
+regex.workspace = true
 sentry.workspace = true
 serde.workspace = true
 sqlx.workspace = true

backend/feature/post/src/adapter/delivery/create_post_request_dto.rs

@@ -6,6 +6,7 @@ use crate::domain::entity::{post::Post, post_info::PostInfo};
 
 #[derive(Deserialize, ToSchema, Clone)]
 pub struct CreatePostRequestDto {
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub content: String,
@@ -24,6 +25,7 @@ impl CreatePostRequestDto {
             id: -1,
             info: PostInfo {
                 id: -1,
+                semantic_id: self.semantic_id,
                 title: self.title,
                 description: self.description,
                 preview_image_url: self.preview_image_url,

backend/feature/post/src/adapter/delivery/post_controller.rs

@@ -15,8 +15,9 @@ use crate::{
             create_label_use_case::CreateLabelUseCase, create_post_use_case::CreatePostUseCase,
             get_all_labels_use_case::GetAllLabelsUseCase,
             get_all_post_info_use_case::GetAllPostInfoUseCase,
-            get_full_post_use_case::GetFullPostUseCase, update_label_use_case::UpdateLabelUseCase,
-            update_post_use_case::UpdatePostUseCase,
+            get_post_by_id_use_case::GetPostByIdUseCase,
+            get_post_by_sementic_id_use_case::GetPostBySemanticIdUseCase,
+            update_label_use_case::UpdateLabelUseCase, update_post_use_case::UpdatePostUseCase,
         },
     },
 };
@@ -34,9 +35,9 @@ pub trait PostController: Send + Sync {
         user_id: Option<i32>,
     ) -> Result<Vec<PostInfoResponseDto>, PostError>;
 
-    async fn get_post_by_id(
+    async fn get_post_by_id_or_semantic_id(
         &self,
-        id: i32,
+        id_or_semantic_id: &str,
         user_id: Option<i32>,
     ) -> Result<PostResponseDto, PostError>;
 
@@ -69,7 +70,8 @@ pub trait PostController: Send + Sync {
 
 pub struct PostControllerImpl {
     get_all_post_info_use_case: Arc<dyn GetAllPostInfoUseCase>,
-    get_full_post_use_case: Arc<dyn GetFullPostUseCase>,
+    get_post_by_id_use_case: Arc<dyn GetPostByIdUseCase>,
+    get_post_by_semantic_id_use_case: Arc<dyn GetPostBySemanticIdUseCase>,
     create_post_use_case: Arc<dyn CreatePostUseCase>,
     update_post_use_case: Arc<dyn UpdatePostUseCase>,
     create_label_use_case: Arc<dyn CreateLabelUseCase>,
@@ -80,7 +82,8 @@ pub struct PostControllerImpl {
 impl PostControllerImpl {
     pub fn new(
         get_all_post_info_use_case: Arc<dyn GetAllPostInfoUseCase>,
-        get_full_post_use_case: Arc<dyn GetFullPostUseCase>,
+        get_post_by_id_use_case: Arc<dyn GetPostByIdUseCase>,
+        get_post_by_semantic_id_use_case: Arc<dyn GetPostBySemanticIdUseCase>,
         create_post_use_case: Arc<dyn CreatePostUseCase>,
         update_post_use_case: Arc<dyn UpdatePostUseCase>,
         create_label_use_case: Arc<dyn CreateLabelUseCase>,
@@ -89,7 +92,8 @@ impl PostControllerImpl {
     ) -> Self {
         Self {
             get_all_post_info_use_case,
-            get_full_post_use_case,
+            get_post_by_id_use_case,
+            get_post_by_semantic_id_use_case,
             create_post_use_case,
             update_post_use_case,
             create_label_use_case,
@@ -97,6 +101,29 @@ impl PostControllerImpl {
             get_all_labels_use_case,
         }
     }
+
+    async fn get_post_by_id(
+        &self,
+        id: i32,
+        user_id: Option<i32>,
+    ) -> Result<PostResponseDto, PostError> {
+        let result = self.get_post_by_id_use_case.execute(id, user_id).await;
+
+        result.map(PostResponseDto::from)
+    }
+
+    async fn get_post_by_semantic_id(
+        &self,
+        semantic_id: &str,
+        user_id: Option<i32>,
+    ) -> Result<PostResponseDto, PostError> {
+        let result = self
+            .get_post_by_semantic_id_use_case
+            .execute(semantic_id, user_id)
+            .await;
+
+        result.map(PostResponseDto::from)
+    }
 }
 
 #[async_trait]
@@ -121,14 +148,17 @@ impl PostController for PostControllerImpl {
         })
     }
 
-    async fn get_post_by_id(
+    async fn get_post_by_id_or_semantic_id(
         &self,
-        id: i32,
+        id_or_semantic_id: &str,
         user_id: Option<i32>,
     ) -> Result<PostResponseDto, PostError> {
-        let result = self.get_full_post_use_case.execute(id, user_id).await;
-
-        result.map(PostResponseDto::from)
+        if let Ok(id) = id_or_semantic_id.parse::<i32>() {
+            self.get_post_by_id(id, user_id).await
+        } else {
+            let semantic_id = id_or_semantic_id;
+            self.get_post_by_semantic_id(semantic_id, user_id).await
+        }
     }
 
     async fn create_label(

backend/feature/post/src/adapter/delivery/post_info_response_dto.rs

@@ -8,6 +8,7 @@ use super::label_response_dto::LabelResponseDto;
 #[derive(Serialize, ToSchema)]
 pub struct PostInfoResponseDto {
     pub id: i32,
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub labels: Vec<LabelResponseDto>,
@@ -23,6 +24,7 @@ impl From<PostInfo> for PostInfoResponseDto {
     fn from(entity: PostInfo) -> Self {
         Self {
             id: entity.id,
+            semantic_id: entity.semantic_id,
             title: entity.title,
             description: entity.description,
             preview_image_url: entity.preview_image_url,

backend/feature/post/src/adapter/delivery/update_post_request_dto.rs

@@ -6,6 +6,7 @@ use crate::domain::entity::{post::Post, post_info::PostInfo};
 
 #[derive(Deserialize, ToSchema, Clone)]
 pub struct UpdatePostRequestDto {
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub content: String,
@@ -24,6 +25,7 @@ impl UpdatePostRequestDto {
             id,
             info: PostInfo {
                 id,
+                semantic_id: self.semantic_id,
                 title: self.title,
                 description: self.description,
                 preview_image_url: self.preview_image_url,

backend/feature/post/src/adapter/gateway/post_db_service.rs

@@ -14,4 +14,5 @@ pub trait PostDbService: Send + Sync {
     async fn get_post_by_id(&self, id: i32) -> Result<PostMapper, PostError>;
     async fn create_post(&self, post: PostMapper, label_ids: &[i32]) -> Result<i32, PostError>;
     async fn update_post(&self, post: PostMapper, label_ids: &[i32]) -> Result<(), PostError>;
+    async fn get_id_by_semantic_id(&self, semantic_id: &str) -> Result<i32, PostError>;
 }

backend/feature/post/src/adapter/gateway/post_info_db_mapper.rs

@@ -4,6 +4,7 @@ use crate::{adapter::gateway::label_db_mapper::LabelMapper, domain::entity::post
 
 pub struct PostInfoMapper {
     pub id: i32,
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub preview_image_url: String,
@@ -15,13 +16,18 @@ impl PostInfoMapper {
     pub fn into_entity(self) -> PostInfo {
         PostInfo {
             id: self.id,
+            semantic_id: self.semantic_id,
             title: self.title.clone(),
             description: self.description.clone(),
             preview_image_url: self.preview_image_url.clone(),
             published_time: self
                 .published_time
                 .map(|dt| DateTime::<Utc>::from_naive_utc_and_offset(dt, Utc)),
-            labels: self.labels.into_iter().map(LabelMapper::into_entity).collect(),
+            labels: self
+                .labels
+                .into_iter()
+                .map(LabelMapper::into_entity)
+                .collect(),
         }
     }
 }

backend/feature/post/src/adapter/gateway/post_repository_impl.rs

@@ -44,6 +44,7 @@ impl PostRepository for PostRepositoryImpl {
     async fn create_post(&self, post: Post, label_ids: &[i32]) -> Result<i32, PostError> {
         let info_mapper = PostInfoMapper {
             id: post.info.id,
+            semantic_id: post.info.semantic_id,
             title: post.info.title,
             description: post.info.description,
             preview_image_url: post.info.preview_image_url,
@@ -65,6 +66,7 @@ impl PostRepository for PostRepositoryImpl {
     async fn update_post(&self, post: Post, label_ids: &[i32]) -> Result<(), PostError> {
         let info_mapper = PostInfoMapper {
             id: post.info.id,
+            semantic_id: post.info.semantic_id,
             title: post.info.title,
             description: post.info.description,
             preview_image_url: post.info.preview_image_url,
@@ -82,4 +84,8 @@ impl PostRepository for PostRepositoryImpl {
             .update_post(post_mapper, label_ids)
             .await
     }
+
+    async fn get_id_by_semantic_id(&self, semantic_id: &str) -> Result<i32, PostError> {
+        self.post_db_service.get_id_by_semantic_id(semantic_id).await
+    }
 }

backend/feature/post/src/application/error/post_error.rs

@@ -4,6 +4,7 @@ use std::fmt::Display;
 pub enum PostError {
     NotFound,
     Unauthorized,
+    InvalidSemanticId,
     Unexpected(anyhow::Error),
 }
 
@@ -12,6 +13,10 @@ impl Display for PostError {
         match self {
             PostError::NotFound => write!(f, "Post not found"),
             PostError::Unauthorized => write!(f, "Unauthorized access to post"),
+            PostError::InvalidSemanticId => write!(
+                f,
+                "Semantic ID shouldn't be numeric and must conform to `^[0-9a-zA-Z_\\-]+$`"
+            ),
             PostError::Unexpected(e) => write!(f, "Unexpected error: {}", e),
         }
     }

backend/feature/post/src/application/gateway/post_repository.rs

@@ -11,4 +11,5 @@ pub trait PostRepository: Send + Sync {
     async fn get_post_by_id(&self, id: i32) -> Result<Post, PostError>;
     async fn create_post(&self, post: Post, label_ids: &[i32]) -> Result<i32, PostError>;
     async fn update_post(&self, post: Post, label_ids: &[i32]) -> Result<(), PostError>;
+    async fn get_id_by_semantic_id(&self, semantic_id: &str) -> Result<i32, PostError>;
 }

backend/feature/post/src/application/use_case.rs

@@ -2,6 +2,7 @@ pub mod create_label_use_case;
 pub mod create_post_use_case;
 pub mod get_all_labels_use_case;
 pub mod get_all_post_info_use_case;
-pub mod get_full_post_use_case;
+pub mod get_post_by_id_use_case;
+pub mod get_post_by_sementic_id_use_case;
 pub mod update_label_use_case;
 pub mod update_post_use_case;

backend/feature/post/src/application/use_case/create_post_use_case.rs

@@ -25,8 +25,7 @@ impl CreatePostUseCaseImpl {
 #[async_trait]
 impl CreatePostUseCase for CreatePostUseCaseImpl {
     async fn execute(&self, post: Post, label_ids: &[i32]) -> Result<i32, PostError> {
-        self.post_repository
-            .create_post(post, label_ids)
-            .await
+        post.validate()?;
+        self.post_repository.create_post(post, label_ids).await
     }
 }

backend/feature/post/src/application/use_case/get_post_by_id_use_case.rs

@@ -8,7 +8,7 @@ use crate::{
 };
 
 #[async_trait]
-pub trait GetFullPostUseCase: Send + Sync {
+pub trait GetPostByIdUseCase: Send + Sync {
     async fn execute(&self, id: i32, user_id: Option<i32>) -> Result<Post, PostError>;
 }
 
@@ -23,7 +23,7 @@ impl GetFullPostUseCaseImpl {
 }
 
 #[async_trait]
-impl GetFullPostUseCase for GetFullPostUseCaseImpl {
+impl GetPostByIdUseCase for GetFullPostUseCaseImpl {
     async fn execute(&self, id: i32, user_id: Option<i32>) -> Result<Post, PostError> {
         let post = self.post_repository.get_post_by_id(id).await?;
 

backend/feature/post/src/application/use_case/get_post_by_sementic_id_use_case.rs

@@ -0,0 +1,45 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+
+use crate::{
+    application::{
+        error::post_error::PostError, gateway::post_repository::PostRepository,
+        use_case::get_post_by_id_use_case::GetPostByIdUseCase,
+    },
+    domain::entity::post::Post,
+};
+
+#[async_trait]
+pub trait GetPostBySemanticIdUseCase: Send + Sync {
+    async fn execute(&self, semantic_id: &str, user_id: Option<i32>) -> Result<Post, PostError>;
+}
+
+pub struct GetPostIdBySemanticIdUseCaseImpl {
+    post_repository: Arc<dyn PostRepository>,
+    get_post_by_id_use_case: Arc<dyn GetPostByIdUseCase>,
+}
+
+impl GetPostIdBySemanticIdUseCaseImpl {
+    pub fn new(
+        post_repository: Arc<dyn PostRepository>,
+        get_post_by_id_use_case: Arc<dyn GetPostByIdUseCase>,
+    ) -> Self {
+        Self {
+            post_repository,
+            get_post_by_id_use_case,
+        }
+    }
+}
+
+#[async_trait]
+impl GetPostBySemanticIdUseCase for GetPostIdBySemanticIdUseCaseImpl {
+    async fn execute(&self, semantic_id: &str, user_id: Option<i32>) -> Result<Post, PostError> {
+        let id = self
+            .post_repository
+            .get_id_by_semantic_id(semantic_id)
+            .await?;
+
+        self.get_post_by_id_use_case.execute(id, user_id).await
+    }
+}

backend/feature/post/src/application/use_case/update_post_use_case.rs

@@ -25,6 +25,7 @@ impl UpdatePostUseCaseImpl {
 #[async_trait]
 impl UpdatePostUseCase for UpdatePostUseCaseImpl {
     async fn execute(&self, post: Post, label_ids: &[i32]) -> Result<(), PostError> {
+        post.validate()?;
         self.post_repository.update_post(post, label_ids).await
     }
 }

backend/feature/post/src/domain/entity/post.rs

@@ -1,3 +1,5 @@
+use crate::application::error::post_error::PostError;
+
 use super::post_info::PostInfo;
 
 pub struct Post {
@@ -5,3 +7,10 @@ pub struct Post {
     pub info: PostInfo,
     pub content: String,
 }
+
+impl Post {
+    pub fn validate(&self) -> Result<(), PostError> {
+        self.info.validate()?;
+        Ok(())
+    }
+}

backend/feature/post/src/domain/entity/post_info.rs

@@ -1,12 +1,31 @@
 use chrono::{DateTime, Utc};
+use regex::Regex;
+
+use crate::application::error::post_error::PostError;
 
 use super::label::Label;
 
 pub struct PostInfo {
     pub id: i32,
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub preview_image_url: String,
     pub labels: Vec<Label>,
     pub published_time: Option<DateTime<Utc>>,
 }
+
+impl PostInfo {
+    pub fn validate(&self) -> Result<(), PostError> {
+        if self.semantic_id.parse::<i32>().is_ok() {
+            return Err(PostError::InvalidSemanticId);
+        }
+
+        let re = Regex::new(r"^[0-9a-zA-Z_\-]+$").unwrap();
+        if !re.is_match(&self.semantic_id) {
+            return Err(PostError::InvalidSemanticId);
+        }
+
+        Ok(())
+    }
+}

backend/feature/post/src/framework/db/post_db_service_impl.rs

@@ -37,6 +37,7 @@ impl PostDbService for PostDbServiceImpl {
             r#"
                 SELECT
                     p.id AS post_id,
+                    p.semantic_id,
                     p.title,
                     p.description,
                     p.preview_image_url,
@@ -74,6 +75,7 @@ impl PostDbService for PostDbServiceImpl {
                 .entry(record.post_id)
                 .or_insert_with(|| PostInfoMapper {
                     id: record.post_id,
+                    semantic_id: record.semantic_id.clone(),
                     title: record.title.clone(),
                     description: record.description.clone(),
                     preview_image_url: record.preview_image_url.clone(),
@@ -111,6 +113,7 @@ impl PostDbService for PostDbServiceImpl {
             r#"
                 SELECT
                     p.id AS post_id,
+                    p.semantic_id,
                     p.title,
                     p.description,
                     p.preview_image_url,
@@ -151,6 +154,7 @@ impl PostDbService for PostDbServiceImpl {
                 .or_insert_with(|| PostMapper {
                     id: record.post_id,
                     info: PostInfoMapper {
+                        semantic_id: record.semantic_id.clone(),
                         id: record.post_id,
                         title: record.title.clone(),
                         description: record.description.clone(),
@@ -194,10 +198,11 @@ impl PostDbService for PostDbServiceImpl {
         let post_id = sqlx::query_scalar!(
             r#"
             INSERT INTO post (
-                title, description, preview_image_url, content, published_time
-            ) VALUES ($1, $2, $3, $4, $5)
+                semantic_id, title, description, preview_image_url, content, published_time
+            ) VALUES ($1, $2, $3, $4, $5, $6)
             RETURNING id
             "#,
+            post.info.semantic_id,
             post.info.title,
             post.info.description,
             post.info.preview_image_url,
@@ -243,13 +248,15 @@ impl PostDbService for PostDbServiceImpl {
             r#"
             UPDATE post
             SET 
-                title = $1, 
-                description = $2, 
-                preview_image_url = $3, 
-                content = $4, 
-                published_time = $5
-            WHERE id = $6
+                semantic_id = $1,
+                title = $2, 
+                description = $3, 
+                preview_image_url = $4, 
+                content = $5, 
+                published_time = $6
+            WHERE id = $7
             "#,
+            post.info.semantic_id,
             post.info.title,
             post.info.description,
             post.info.preview_image_url,
@@ -300,4 +307,23 @@ impl PostDbService for PostDbServiceImpl {
 
         Ok(())
     }
+
+    async fn get_id_by_semantic_id(&self, semantic_id: &str) -> Result<i32, PostError> {
+        let id = sqlx::query_scalar!(
+            r#"
+            SELECT id
+            FROM post
+            WHERE semantic_id = $1 AND deleted_time IS NULL
+            "#,
+            semantic_id,
+        )
+        .fetch_optional(&self.db_pool)
+        .await
+        .map_err(|e| PostError::Unexpected(DatabaseError(e).into()))?;
+
+        match id {
+            Some(id) => Ok(id),
+            None => Err(PostError::NotFound),
+        }
+    }
 }

backend/feature/post/src/framework/db/post_info_with_label_record.rs

@@ -3,6 +3,7 @@ use chrono::NaiveDateTime;
 #[derive(sqlx::FromRow)]
 pub struct PostInfoWithLabelRecord {
     pub post_id: i32,
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub preview_image_url: String,

backend/feature/post/src/framework/db/post_with_label_record.rs

@@ -3,6 +3,7 @@ use chrono::NaiveDateTime;
 #[derive(sqlx::FromRow)]
 pub struct PostWithLabelRecord {
     pub post_id: i32,
+    pub semantic_id: String,
     pub title: String,
     pub description: String,
     pub preview_image_url: String,

backend/feature/post/src/framework/web/create_label_handler.rs

@@ -32,12 +32,16 @@ pub async fn create_label_handler(
 
     match result {
         Ok(label) => HttpResponse::Created().json(label),
-        Err(e) => {
-            match e {
-                PostError::Unexpected(e) => capture_anyhow(&e),
-                _ => capture_anyhow(&anyhow!(e)),
-            };
+        Err(e) => match e {
+            PostError::Unauthorized => HttpResponse::Unauthorized().finish(),
+            PostError::NotFound | PostError::InvalidSemanticId => {
+                capture_anyhow(&anyhow!(e));
                 HttpResponse::InternalServerError().finish()
             }
+            PostError::Unexpected(e) => {
+                capture_anyhow(&e);
+                HttpResponse::InternalServerError().finish()
+            }
+        },
     }
 }

backend/feature/post/src/framework/web/create_post_handler.rs

@@ -34,12 +34,17 @@ pub async fn create_post_handler(
 
     match result {
         Ok(post) => HttpResponse::Created().json(post),
-        Err(e) => {
-            match e {
-                PostError::Unexpected(e) => capture_anyhow(&e),
-                _ => capture_anyhow(&anyhow!(e)),
-            };
+        Err(e) => match e {
+            PostError::Unauthorized => HttpResponse::Unauthorized().finish(),
+            PostError::InvalidSemanticId => HttpResponse::BadRequest().finish(),
+            PostError::NotFound => {
+                capture_anyhow(&anyhow!(e));
                 HttpResponse::InternalServerError().finish()
             }
+            PostError::Unexpected(e) => {
+                capture_anyhow(&e);
+                HttpResponse::InternalServerError().finish()
+            }
+        },
     }
 }

backend/feature/post/src/framework/web/get_all_labels_handler.rs

@@ -23,12 +23,15 @@ pub async fn get_all_labels_handler(
 
     match result {
         Ok(labels) => HttpResponse::Ok().json(labels),
-        Err(e) => {
-            match e {
-                PostError::Unexpected(e) => capture_anyhow(&e),
-                _ => capture_anyhow(&anyhow!(e)),
-            };
+        Err(e) => match e {
+            PostError::NotFound | PostError::Unauthorized | PostError::InvalidSemanticId => {
+                capture_anyhow(&anyhow!(e));
                 HttpResponse::InternalServerError().finish()
             }
+            PostError::Unexpected(e) => {
+                capture_anyhow(&e);
+                HttpResponse::InternalServerError().finish()
+            }
+        },
     }
 }

backend/feature/post/src/framework/web/get_all_post_info_handler.rs

@@ -35,12 +35,15 @@ pub async fn get_all_post_info_handler(
 
     match result {
         Ok(post_info_list) => HttpResponse::Ok().json(post_info_list),
-        Err(e) => {
-            match e {
-                PostError::Unexpected(e) => capture_anyhow(&e),
-                _ => capture_anyhow(&anyhow!(e)),
-            };
+        Err(e) => match e {
+            PostError::NotFound | PostError::Unauthorized | PostError::InvalidSemanticId => {
+                capture_anyhow(&anyhow!(e));
                 HttpResponse::InternalServerError().finish()
             }
+            PostError::Unexpected(e) => {
+                capture_anyhow(&e);
+                HttpResponse::InternalServerError().finish()
+            }
+        },
     }
 }

backend/feature/post/src/framework/web/get_post_by_id_handler.rs

@@ -1,4 +1,5 @@
 use actix_web::{HttpResponse, Responder, web};
+use anyhow::anyhow;
 use auth::framework::web::auth_middleware::UserId;
 use sentry::integrations::anyhow::capture_anyhow;
 
@@ -11,8 +12,8 @@ use crate::{
     get,
     path = "/post/{id}",
     tag = "post",
-    summary = "Get post by ID",
-    description = "Only authenticated users can access unpublished posts.",
+    summary = "Get post by ID or semantic ID",
+    description = "Only authenticated users can access unpublished posts. Accepts either numeric ID or semantic ID.",
     responses (
         (status = 200, body = PostResponseDto),
         (status = 404, description = "Post not found")
@@ -20,12 +21,12 @@ use crate::{
 )]
 pub async fn get_post_by_id_handler(
     post_controller: web::Data<dyn PostController>,
-    path: web::Path<i32>,
+    path: web::Path<String>,
     user_id: Option<UserId>,
 ) -> impl Responder {
-    let id = path.into_inner();
+    let id_or_semantic_id = path.into_inner();
     let result = post_controller
-        .get_post_by_id(id, user_id.map(|id| id.get()))
+        .get_post_by_id_or_semantic_id(&id_or_semantic_id, user_id.map(|id| id.get()))
         .await;
 
     match result {
@@ -33,6 +34,10 @@ pub async fn get_post_by_id_handler(
         Err(e) => match e {
             PostError::NotFound => HttpResponse::NotFound().finish(),
             PostError::Unauthorized => HttpResponse::Unauthorized().finish(),
+            PostError::InvalidSemanticId => {
+                capture_anyhow(&anyhow!(e));
+                HttpResponse::InternalServerError().finish()
+            }
             PostError::Unexpected(e) => {
                 capture_anyhow(&e);
                 HttpResponse::InternalServerError().finish()

backend/feature/post/src/framework/web/update_label_handler.rs

@@ -1,4 +1,5 @@
 use actix_web::{HttpResponse, Responder, web};
+use anyhow::anyhow;
 use auth::framework::web::auth_middleware::UserId;
 use sentry::integrations::anyhow::capture_anyhow;
 
@@ -39,6 +40,10 @@ pub async fn update_label_handler(
         Err(e) => match e {
             PostError::NotFound => HttpResponse::NotFound().finish(),
             PostError::Unauthorized => HttpResponse::Unauthorized().finish(),
+            PostError::InvalidSemanticId => {
+                capture_anyhow(&anyhow!(e));
+                HttpResponse::InternalServerError().finish()
+            }
             PostError::Unexpected(e) => {
                 capture_anyhow(&e);
                 HttpResponse::InternalServerError().finish()

backend/feature/post/src/framework/web/update_post_handler.rs

@@ -39,6 +39,7 @@ pub async fn update_post_handler(
         Err(e) => match e {
             PostError::NotFound => HttpResponse::NotFound().finish(),
             PostError::Unauthorized => HttpResponse::Unauthorized().finish(),
+            PostError::InvalidSemanticId => HttpResponse::BadRequest().finish(),
             PostError::Unexpected(e) => {
                 capture_anyhow(&e);
                 HttpResponse::InternalServerError().finish()

backend/migrations/20251011200359_add_semantic_id_to_post.down.sql

@@ -0,0 +1,5 @@
+-- Drop the unique index on semantic_id
+DROP INDEX IF EXISTS idx_post_semantic_id;
+
+-- Remove the semantic_id column from post table
+ALTER TABLE post DROP COLUMN IF EXISTS "semantic_id";

backend/migrations/20251011200359_add_semantic_id_to_post.sql

@@ -0,0 +1,7 @@
+ALTER TABLE post ADD COLUMN "semantic_id" VARCHAR(100) NOT NULL DEFAULT '';
+
+-- Update existing records to use their id as semantic_id
+UPDATE post SET semantic_id = id::VARCHAR WHERE semantic_id = '';
+
+-- Create unique index on semantic_id
+CREATE UNIQUE INDEX idx_post_semantic_id ON post (semantic_id);

backend/server/src/container.rs

@@ -36,13 +36,12 @@ use post::{
         },
     },
     application::use_case::{
-        create_label_use_case::CreateLabelUseCaseImpl,
-        create_post_use_case::CreatePostUseCaseImpl,
+        create_label_use_case::CreateLabelUseCaseImpl, create_post_use_case::CreatePostUseCaseImpl,
         get_all_labels_use_case::GetAllLabelsUseCaseImpl,
         get_all_post_info_use_case::GetAllPostInfoUseCaseImpl,
-        get_full_post_use_case::GetFullPostUseCaseImpl,
-        update_label_use_case::UpdateLabelUseCaseImpl,
-        update_post_use_case::UpdatePostUseCaseImpl,
+        get_post_by_id_use_case::GetFullPostUseCaseImpl,
+        get_post_by_sementic_id_use_case::GetPostIdBySemanticIdUseCaseImpl,
+        update_label_use_case::UpdateLabelUseCaseImpl, update_post_use_case::UpdatePostUseCaseImpl,
     },
     framework::db::{
         label_db_service_impl::LabelDbServiceImpl, post_db_service_impl::PostDbServiceImpl,
@@ -97,7 +96,12 @@ impl Container {
 
         let get_all_post_info_use_case =
             Arc::new(GetAllPostInfoUseCaseImpl::new(post_repository.clone()));
-        let get_full_post_use_case = Arc::new(GetFullPostUseCaseImpl::new(post_repository.clone()));
+        let get_post_by_id_use_case =
+            Arc::new(GetFullPostUseCaseImpl::new(post_repository.clone()));
+        let get_post_by_semantic_id_use_case = Arc::new(GetPostIdBySemanticIdUseCaseImpl::new(
+            post_repository.clone(),
+            get_post_by_id_use_case.clone(),
+        ));
         let create_post_use_case = Arc::new(CreatePostUseCaseImpl::new(post_repository.clone()));
         let update_post_use_case = Arc::new(UpdatePostUseCaseImpl::new(post_repository.clone()));
         let create_label_use_case = Arc::new(CreateLabelUseCaseImpl::new(label_repository.clone()));
@@ -107,7 +111,8 @@ impl Container {
 
         let post_controller = Arc::new(PostControllerImpl::new(
             get_all_post_info_use_case,
-            get_full_post_use_case,
+            get_post_by_id_use_case,
+            get_post_by_semantic_id_use_case,
             create_post_use_case,
             update_post_use_case,
             create_label_use_case,