feat: migrate imphnen-backend-hackathon into workspace as imphnen-hackathon crate

Consolidates the standalone hackathon backend (16 crates) into a single
imphnen-hackathon crate following the existing clean architecture patterns.
All endpoints are exposed under /v1/hackathon/ via the gateway.

Features migrated:
- Auth: Supabase-based signup/login/GitHub OAuth/password reset (own JWT)
- Users: profile management with team listing
- Teams: CRUD with city validation, deadline enforcement, invite system
- Invitations: team member invitations with accept/reject flow
- Join Requests: team join request workflow
- Chat: team messaging with author/leader delete permissions
- Submissions: project submission lifecycle (draft→pending→submitted)
- Storage: Supabase Storage file upload endpoints
- Certificates: public user certificate data endpoint
- Winners: public winners listing
- Admin: admin-only CRUD for all entities

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

imphnen-hackathon/src/join_requests/application/join_request_service.rs

@@ -0,0 +1,117 @@
+use std::sync::Arc;
+use uuid::Uuid;
+use async_trait::async_trait;
+use chrono::{Utc, TimeZone};
+use imphnen_utils::errors::AppError;
+use crate::join_requests::domain::entity::*;
+use crate::join_requests::domain::repository::JoinRequestRepository;
+use crate::join_requests::domain::service::JoinRequestService;
+
+fn is_team_features_closed() -> bool {
+    let deadline = Utc.with_ymd_and_hms(2025, 11, 30, 16, 59, 0).unwrap();
+    Utc::now() >= deadline
+}
+
+pub struct JoinRequestServiceImpl {
+    repo: Arc<dyn JoinRequestRepository>,
+}
+
+impl JoinRequestServiceImpl {
+    pub fn new(repo: Arc<dyn JoinRequestRepository>) -> Self {
+        Self { repo }
+    }
+}
+
+#[async_trait]
+impl JoinRequestService for JoinRequestServiceImpl {
+    async fn create_join_request(
+        &self,
+        team_id: Uuid,
+        user_id: Uuid,
+        input: CreateJoinRequestInput,
+    ) -> Result<JoinRequestWithDetails, AppError> {
+        if is_team_features_closed() {
+            return Err(AppError::BadRequestError(
+                "Join requests are closed (deadline: November 30, 2025).".to_string(),
+            ));
+        }
+        if !self.repo.team_exists(team_id).await? {
+            return Err(AppError::NotFoundError("Team not found".to_string()));
+        }
+        if self.repo.team_has_submission(team_id).await? {
+            return Err(AppError::BadRequestError("Cannot request to join a team that has already submitted".to_string()));
+        }
+        if let Some(active_team) = self.repo.user_active_team_name(user_id).await? {
+            return Err(AppError::ConflictError(format!("You are already a member of team '{}'", active_team)));
+        }
+        let count = self.repo.active_member_count(team_id).await?;
+        if count >= 5 {
+            return Err(AppError::BadRequestError("Team is already full (max 5 members)".to_string()));
+        }
+        if self.repo.pending_request_exists(team_id, user_id).await? {
+            return Err(AppError::ConflictError("You already have a pending request for this team".to_string()));
+        }
+        let id = Uuid::new_v4();
+        let entity = self.repo.create(id, team_id, user_id, &input.message).await?;
+        let details: Vec<JoinRequestWithDetails> = self.repo.find_by_user(user_id).await?;
+        details.into_iter().find(|r| r.id == entity.id)
+            .ok_or_else(|| AppError::InternalServerError("Failed to retrieve created join request".to_string()))
+    }
+
+    async fn get_my_join_requests(&self, user_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError> {
+        self.repo.find_by_user(user_id).await
+    }
+
+    async fn get_team_join_requests(
+        &self,
+        team_id: Uuid,
+        user_id: Uuid,
+    ) -> Result<Vec<JoinRequestWithDetails>, AppError> {
+        let leader_id = self.repo.get_team_leader_id(team_id).await?
+            .ok_or_else(|| AppError::NotFoundError("Team not found".to_string()))?;
+        if leader_id != user_id {
+            return Err(AppError::ForbiddenError("Only the team leader can view join requests".to_string()));
+        }
+        self.repo.find_pending_by_team(team_id).await
+    }
+
+    async fn respond_to_join_request(
+        &self,
+        request_id: Uuid,
+        user_id: Uuid,
+        accept: bool,
+    ) -> Result<(), AppError> {
+        let request = self.repo.find_by_id(request_id).await?
+            .ok_or_else(|| AppError::NotFoundError("Join request not found".to_string()))?;
+        let leader_id = self.repo.get_team_leader_id(request.team_id).await?
+            .ok_or_else(|| AppError::NotFoundError("Team not found".to_string()))?;
+        if leader_id != user_id {
+            return Err(AppError::ForbiddenError("Only the team leader can respond to join requests".to_string()));
+        }
+        if request.status != "pending" {
+            return Err(AppError::BadRequestError("Join request is no longer pending".to_string()));
+        }
+        if accept {
+            if is_team_features_closed() {
+                return Err(AppError::BadRequestError("Team features are now closed".to_string()));
+            }
+            if self.repo.team_has_submission(request.team_id).await? {
+                return Err(AppError::BadRequestError("Cannot accept join request after submitting a project".to_string()));
+            }
+            if let Some(active_team) = self.repo.user_active_team_name(request.user_id).await? {
+                return Err(AppError::ConflictError(format!("User is already a member of team '{}'", active_team)));
+            }
+            let count = self.repo.active_member_count(request.team_id).await?;
+            if count >= 5 {
+                return Err(AppError::BadRequestError("Team is already full".to_string()));
+            }
+            self.repo.update_status(request_id, "accepted").await?;
+            self.repo.add_team_member(request.team_id, request.user_id).await?;
+            self.repo.reject_pending_invitations_for_user(request.user_id).await?;
+            self.repo.reject_other_pending_for_user(request.user_id, request_id).await?;
+        } else {
+            self.repo.update_status(request_id, "rejected").await?;
+        }
+        Ok(())
+    }
+}

imphnen-hackathon/src/join_requests/application/mod.rs

@@ -0,0 +1 @@
+pub mod join_request_service;

imphnen-hackathon/src/join_requests/domain/entity.rs

@@ -0,0 +1,30 @@
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, Clone)]
+pub struct JoinRequestEntity {
+    pub id: Uuid,
+    pub team_id: Uuid,
+    pub user_id: Uuid,
+    pub message: String,
+    pub status: String,
+    pub created_at: Option<DateTime<Utc>>,
+}
+
+#[derive(Debug, Clone)]
+pub struct JoinRequestWithDetails {
+    pub id: Uuid,
+    pub team_id: Uuid,
+    pub user_id: Uuid,
+    pub user_fullname: String,
+    pub user_email: String,
+    pub user_avatar: Option<String>,
+    pub message: String,
+    pub status: String,
+    pub created_at: Option<DateTime<Utc>>,
+}
+
+#[derive(Debug, Default)]
+pub struct CreateJoinRequestInput {
+    pub message: String,
+}

imphnen-hackathon/src/join_requests/domain/mod.rs

@@ -0,0 +1,3 @@
+pub mod entity;
+pub mod repository;
+pub mod service;

imphnen-hackathon/src/join_requests/domain/repository.rs

@@ -0,0 +1,43 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+use imphnen_utils::errors::AppError;
+use super::entity::*;
+
+#[async_trait]
+pub trait JoinRequestRepository: Send + Sync {
+    async fn create(
+        &self,
+        id: Uuid,
+        team_id: Uuid,
+        user_id: Uuid,
+        message: &str,
+    ) -> Result<JoinRequestEntity, AppError>;
+
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<JoinRequestEntity>, AppError>;
+
+    async fn find_by_user(&self, user_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError>;
+
+    async fn find_pending_by_team(&self, team_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError>;
+
+    async fn update_status(&self, id: Uuid, status: &str) -> Result<(), AppError>;
+
+    async fn add_team_member(&self, team_id: Uuid, user_id: Uuid) -> Result<(), AppError>;
+
+    async fn reject_pending_invitations_for_user(&self, user_id: Uuid) -> Result<(), AppError>;
+
+    async fn reject_other_pending_for_user(&self, user_id: Uuid, except_id: Uuid) -> Result<(), AppError>;
+
+    async fn get_team_leader_id(&self, team_id: Uuid) -> Result<Option<Uuid>, AppError>;
+
+    async fn get_user_email(&self, user_id: Uuid) -> Result<Option<String>, AppError>;
+
+    async fn team_exists(&self, team_id: Uuid) -> Result<bool, AppError>;
+
+    async fn team_has_submission(&self, team_id: Uuid) -> Result<bool, AppError>;
+
+    async fn user_active_team_name(&self, user_id: Uuid) -> Result<Option<String>, AppError>;
+
+    async fn active_member_count(&self, team_id: Uuid) -> Result<i64, AppError>;
+
+    async fn pending_request_exists(&self, team_id: Uuid, user_id: Uuid) -> Result<bool, AppError>;
+}

imphnen-hackathon/src/join_requests/domain/service.rs

@@ -0,0 +1,29 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+use imphnen_utils::errors::AppError;
+use super::entity::*;
+
+#[async_trait]
+pub trait JoinRequestService: Send + Sync {
+    async fn create_join_request(
+        &self,
+        team_id: Uuid,
+        user_id: Uuid,
+        input: CreateJoinRequestInput,
+    ) -> Result<JoinRequestWithDetails, AppError>;
+
+    async fn get_my_join_requests(&self, user_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError>;
+
+    async fn get_team_join_requests(
+        &self,
+        team_id: Uuid,
+        user_id: Uuid,
+    ) -> Result<Vec<JoinRequestWithDetails>, AppError>;
+
+    async fn respond_to_join_request(
+        &self,
+        request_id: Uuid,
+        user_id: Uuid,
+        accept: bool,
+    ) -> Result<(), AppError>;
+}

imphnen-hackathon/src/join_requests/infrastructure/http/dto.rs

@@ -0,0 +1,50 @@
+use serde::{Deserialize, Serialize};
+use utoipa::ToSchema;
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+use crate::join_requests::domain::entity::*;
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct JoinRequestResponse {
+    pub id: Uuid,
+    pub team_id: Uuid,
+    pub user_id: Uuid,
+    pub user_fullname: String,
+    pub user_email: String,
+    pub user_avatar: Option<String>,
+    pub message: String,
+    pub status: String,
+    pub created_at: Option<DateTime<Utc>>,
+}
+
+impl From<JoinRequestWithDetails> for JoinRequestResponse {
+    fn from(e: JoinRequestWithDetails) -> Self {
+        Self {
+            id: e.id,
+            team_id: e.team_id,
+            user_id: e.user_id,
+            user_fullname: e.user_fullname,
+            user_email: e.user_email,
+            user_avatar: e.user_avatar,
+            message: e.message,
+            status: e.status,
+            created_at: e.created_at,
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct CreateJoinRequestRequest {
+    pub message: String,
+}
+
+impl From<CreateJoinRequestRequest> for CreateJoinRequestInput {
+    fn from(r: CreateJoinRequestRequest) -> Self {
+        Self { message: r.message }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
+pub struct RespondToJoinRequestRequest {
+    pub accept: bool,
+}

imphnen-hackathon/src/join_requests/infrastructure/http/handlers.rs

@@ -0,0 +1,47 @@
+use axum::{Extension, Json, extract::Path, response::IntoResponse};
+use std::sync::Arc;
+use uuid::Uuid;
+use imphnen_utils::{errors::AppError, response_format::{ApiSuccess, ApiMessage}};
+use crate::middleware::hackathon_auth::HackathonAuthUser;
+use crate::join_requests::domain::service::JoinRequestService;
+use super::dto::*;
+
+pub async fn create_join_request_handler(
+    Extension(service): Extension<Arc<dyn JoinRequestService>>,
+    Extension(auth): Extension<HackathonAuthUser>,
+    Path(team_id): Path<Uuid>,
+    Json(body): Json<CreateJoinRequestRequest>,
+) -> Result<axum::response::Response, AppError> {
+    let request = service.create_join_request(team_id, auth.user_id, body.into()).await?;
+    Ok(ApiSuccess(JoinRequestResponse::from(request)).into_response())
+}
+
+pub async fn get_my_join_requests_handler(
+    Extension(service): Extension<Arc<dyn JoinRequestService>>,
+    Extension(auth): Extension<HackathonAuthUser>,
+) -> Result<axum::response::Response, AppError> {
+    let list = service.get_my_join_requests(auth.user_id).await?;
+    let response: Vec<JoinRequestResponse> = list.into_iter().map(JoinRequestResponse::from).collect();
+    Ok(ApiSuccess(response).into_response())
+}
+
+pub async fn get_team_join_requests_handler(
+    Extension(service): Extension<Arc<dyn JoinRequestService>>,
+    Extension(auth): Extension<HackathonAuthUser>,
+    Path(team_id): Path<Uuid>,
+) -> Result<axum::response::Response, AppError> {
+    let list = service.get_team_join_requests(team_id, auth.user_id).await?;
+    let response: Vec<JoinRequestResponse> = list.into_iter().map(JoinRequestResponse::from).collect();
+    Ok(ApiSuccess(response).into_response())
+}
+
+pub async fn respond_to_join_request_handler(
+    Extension(service): Extension<Arc<dyn JoinRequestService>>,
+    Extension(auth): Extension<HackathonAuthUser>,
+    Path(request_id): Path<Uuid>,
+    Json(body): Json<RespondToJoinRequestRequest>,
+) -> Result<axum::response::Response, AppError> {
+    service.respond_to_join_request(request_id, auth.user_id, body.accept).await?;
+    let msg = if body.accept { "Join request accepted" } else { "Join request rejected" };
+    Ok(ApiMessage::ok(msg).into_response())
+}

imphnen-hackathon/src/join_requests/infrastructure/http/mod.rs

@@ -0,0 +1,3 @@
+pub mod dto;
+pub mod handlers;
+pub mod routes;

imphnen-hackathon/src/join_requests/infrastructure/http/routes.rs

@@ -0,0 +1,24 @@
+use axum::{middleware::from_fn, routing::{get, post}, Extension, Router};
+use sqlx::PgPool;
+use std::sync::Arc;
+use crate::join_requests::application::join_request_service::JoinRequestServiceImpl;
+use crate::join_requests::domain::service::JoinRequestService;
+use crate::join_requests::infrastructure::persistence::PostgresJoinRequestRepository;
+use crate::common::hackathon_jwt::HackathonJwtService;
+use crate::middleware::hackathon_auth::hackathon_auth_middleware;
+use super::handlers::*;
+
+pub fn build_join_request_routes(pool: Arc<PgPool>, jwt: Arc<HackathonJwtService>) -> Router {
+    let service: Arc<dyn JoinRequestService> = Arc::new(JoinRequestServiceImpl::new(
+        Arc::new(PostgresJoinRequestRepository::new(pool.clone())),
+    ));
+    Router::new()
+        .route("/join-requests/teams/:team_id", post(create_join_request_handler))
+        .route("/join-requests/my", get(get_my_join_requests_handler))
+        .route("/join-requests/teams/:team_id/pending", get(get_team_join_requests_handler))
+        .route("/join-requests/:request_id/respond", post(respond_to_join_request_handler))
+        .layer(Extension(service))
+        .layer(Extension(jwt.clone()))
+        .layer(Extension(pool))
+        .layer(from_fn(hackathon_auth_middleware))
+}

imphnen-hackathon/src/join_requests/infrastructure/mod.rs

@@ -0,0 +1,2 @@
+pub mod http;
+pub mod persistence;

imphnen-hackathon/src/join_requests/infrastructure/persistence/mod.rs

@@ -0,0 +1,2 @@
+pub mod postgres_join_request_repository;
+pub use postgres_join_request_repository::PostgresJoinRequestRepository;

imphnen-hackathon/src/join_requests/infrastructure/persistence/postgres_join_request_repository.rs

@@ -0,0 +1,173 @@
+use std::sync::Arc;
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+use async_trait::async_trait;
+use sqlx::{PgPool, FromRow};
+use imphnen_utils::errors::AppError;
+use crate::join_requests::domain::entity::*;
+use crate::join_requests::domain::repository::JoinRequestRepository;
+
+#[derive(FromRow)]
+struct JoinRequestRow {
+    id: Uuid,
+    team_id: Uuid,
+    user_id: Uuid,
+    message: String,
+    status: String,
+    created_at: Option<DateTime<Utc>>,
+}
+
+impl From<JoinRequestRow> for JoinRequestEntity {
+    fn from(r: JoinRequestRow) -> Self {
+        Self {
+            id: r.id,
+            team_id: r.team_id,
+            user_id: r.user_id,
+            message: r.message,
+            status: r.status,
+            created_at: r.created_at,
+        }
+    }
+}
+
+#[derive(FromRow)]
+struct JoinRequestDetailsRow {
+    id: Uuid,
+    team_id: Uuid,
+    user_id: Uuid,
+    user_fullname: String,
+    user_email: String,
+    user_avatar: Option<String>,
+    message: String,
+    status: String,
+    created_at: Option<DateTime<Utc>>,
+}
+
+impl From<JoinRequestDetailsRow> for JoinRequestWithDetails {
+    fn from(r: JoinRequestDetailsRow) -> Self {
+        Self {
+            id: r.id,
+            team_id: r.team_id,
+            user_id: r.user_id,
+            user_fullname: r.user_fullname,
+            user_email: r.user_email,
+            user_avatar: r.user_avatar,
+            message: r.message,
+            status: r.status,
+            created_at: r.created_at,
+        }
+    }
+}
+
+pub struct PostgresJoinRequestRepository {
+    pool: Arc<PgPool>,
+}
+
+impl PostgresJoinRequestRepository {
+    pub fn new(pool: Arc<PgPool>) -> Self {
+        Self { pool }
+    }
+}
+
+#[async_trait]
+impl JoinRequestRepository for PostgresJoinRequestRepository {
+    async fn create(&self, id: Uuid, team_id: Uuid, user_id: Uuid, message: &str) -> Result<JoinRequestEntity, AppError> {
+        let row: JoinRequestRow = sqlx::query_as(
+            "INSERT INTO hackathon_team_join_requests (id, team_id, user_id, message, status, created_at) VALUES ($1, $2, $3, $4, 'pending', NOW()) RETURNING id, team_id, user_id, message, status, created_at"
+        )
+        .bind(id).bind(team_id).bind(user_id).bind(message)
+        .fetch_one(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(row.into())
+    }
+
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<JoinRequestEntity>, AppError> {
+        let row: Option<JoinRequestRow> = sqlx::query_as(
+            "SELECT id, team_id, user_id, message, status, created_at FROM hackathon_team_join_requests WHERE id = $1"
+        )
+        .bind(id).fetch_optional(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(row.map(Into::into))
+    }
+
+    async fn find_by_user(&self, user_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError> {
+        let rows: Vec<JoinRequestDetailsRow> = sqlx::query_as(
+            "SELECT r.id, r.team_id, r.user_id, u.fullname AS user_fullname, u.email AS user_email, u.avatar AS user_avatar, r.message, r.status, r.created_at FROM hackathon_team_join_requests r JOIN hackathon_users u ON u.id = r.user_id WHERE r.user_id = $1 ORDER BY r.created_at DESC"
+        )
+        .bind(user_id).fetch_all(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
+    async fn find_pending_by_team(&self, team_id: Uuid) -> Result<Vec<JoinRequestWithDetails>, AppError> {
+        let rows: Vec<JoinRequestDetailsRow> = sqlx::query_as(
+            "SELECT r.id, r.team_id, r.user_id, u.fullname AS user_fullname, u.email AS user_email, u.avatar AS user_avatar, r.message, r.status, r.created_at FROM hackathon_team_join_requests r JOIN hackathon_users u ON u.id = r.user_id WHERE r.team_id = $1 AND r.status = 'pending' ORDER BY r.created_at ASC"
+        )
+        .bind(team_id).fetch_all(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(rows.into_iter().map(Into::into).collect())
+    }
+
+    async fn update_status(&self, id: Uuid, status: &str) -> Result<(), AppError> {
+        sqlx::query("UPDATE hackathon_team_join_requests SET status = $1 WHERE id = $2")
+            .bind(status).bind(id)
+            .execute(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn add_team_member(&self, team_id: Uuid, user_id: Uuid) -> Result<(), AppError> {
+        sqlx::query("INSERT INTO hackathon_team_members (id, team_id, user_id, role, status, joined_at) VALUES ($1, $2, $3, 'member', 'active', NOW())")
+            .bind(Uuid::new_v4()).bind(team_id).bind(user_id)
+            .execute(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn reject_pending_invitations_for_user(&self, user_id: Uuid) -> Result<(), AppError> {
+        let email: Option<String> = sqlx::query_scalar("SELECT email FROM hackathon_users WHERE id = $1")
+            .bind(user_id).fetch_optional(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        if let Some(email) = email {
+            sqlx::query("UPDATE hackathon_team_invitations SET status = 'rejected' WHERE invitee_email = $1 AND status = 'pending'")
+                .bind(email)
+                .execute(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        }
+        Ok(())
+    }
+
+    async fn reject_other_pending_for_user(&self, user_id: Uuid, except_id: Uuid) -> Result<(), AppError> {
+        sqlx::query("UPDATE hackathon_team_join_requests SET status = 'rejected' WHERE user_id = $1 AND status = 'pending' AND id != $2")
+            .bind(user_id).bind(except_id)
+            .execute(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn get_team_leader_id(&self, team_id: Uuid) -> Result<Option<Uuid>, AppError> {
+        sqlx::query_scalar("SELECT leader_id FROM hackathon_teams WHERE id = $1")
+            .bind(team_id).fetch_optional(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn get_user_email(&self, user_id: Uuid) -> Result<Option<String>, AppError> {
+        sqlx::query_scalar("SELECT email FROM hackathon_users WHERE id = $1")
+            .bind(user_id).fetch_optional(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn team_exists(&self, team_id: Uuid) -> Result<bool, AppError> {
+        sqlx::query_scalar("SELECT EXISTS(SELECT 1 FROM hackathon_teams WHERE id = $1)")
+            .bind(team_id).fetch_one(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn team_has_submission(&self, team_id: Uuid) -> Result<bool, AppError> {
+        sqlx::query_scalar("SELECT EXISTS(SELECT 1 FROM hackathon_project_submissions WHERE team_id = $1)")
+            .bind(team_id).fetch_one(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn user_active_team_name(&self, user_id: Uuid) -> Result<Option<String>, AppError> {
+        sqlx::query_scalar("SELECT t.name FROM hackathon_teams t JOIN hackathon_team_members m ON m.team_id = t.id WHERE m.user_id = $1 AND m.status = 'active' LIMIT 1")
+            .bind(user_id).fetch_optional(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn active_member_count(&self, team_id: Uuid) -> Result<i64, AppError> {
+        sqlx::query_scalar("SELECT COUNT(*) FROM hackathon_team_members WHERE team_id = $1 AND status = 'active'")
+            .bind(team_id).fetch_one(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+
+    async fn pending_request_exists(&self, team_id: Uuid, user_id: Uuid) -> Result<bool, AppError> {
+        sqlx::query_scalar("SELECT EXISTS(SELECT 1 FROM hackathon_team_join_requests WHERE team_id = $1 AND user_id = $2 AND status = 'pending')")
+            .bind(team_id).bind(user_id).fetch_one(self.pool.as_ref()).await.map_err(|e| AppError::InternalServerError(e.to_string()))
+    }
+}

imphnen-hackathon/src/join_requests/mod.rs

@@ -0,0 +1,5 @@
+pub mod domain;
+pub mod application;
+pub mod infrastructure;
+
+pub use infrastructure::http::routes::build_join_request_routes;