feat: Implement hackathon status change functionality with audit logging

- Added HackathonStatusChangeRequestDto for status change requests.
- Implemented update_hackathon_status method in HackathonRepository to handle status updates.
- Enhanced HackathonService to validate and process status changes, including audit logging.
- Introduced HackathonAuditLogSchema to track changes and actions related to hackathons.
- Created HackathonAuditRepository for managing audit logs.
- Added validation functions for hackathon operations, including dates, organizers, and prizes.
- Implemented atomic service for creating hackathons with timelines and events, ensuring all-or-nothing behavior.
- Updated mod.rs to include new modules for audit logging and validation.

imphnen-hackathon/src/v1/hackathon/hackathon_atomic_service.rs

@@ -0,0 +1,278 @@
+use super::hackathon_dto::{
+    HackathonCreateRequestDto, HackathonDto, HackathonEventCreateRequestDto,
+    HackathonTimelineCreateRequestDto,
+};
+use super::hackathon_repository::HackathonRepository;
+use super::hackathon_schema::{HackathonSchema, HackathonEventsSchema, HackathonTimelineSchema};
+use super::hackathon_audit_schema::{AuditAction, HackathonAuditLogSchema};
+use super::hackathon_audit_repository::HackathonAuditRepository;
+use super::hackathon_validation::{validate_timeline_phases, validate_dates, validate_organizers, validate_prizes, MAX_EVENTS_PER_HACKATHON};
+use crate::{AppState, ResponseSuccessDto, ErrorDto};
+use axum::http::StatusCode;
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+use utoipa::ToSchema;
+use validator::Validate;
+
+/// Request DTO for atomic hackathon creation with timeline and events
+#[derive(Clone, Debug, Serialize, Deserialize, ToSchema, Validate)]
+pub struct HackathonCompleteSetupRequestDto {
+    #[validate(nested)]
+    pub hackathon: HackathonCreateRequestDto,
+    
+    #[validate(length(min = 1, message = "At least one timeline phase is required"))]
+    pub timelines: Vec<HackathonTimelineCreateRequestDto>,
+    
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub events: Option<Vec<HackathonEventCreateRequestDto>>,
+    
+    /// Actor ID for audit logging
+    pub actor_id: String,
+    
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub actor_email: Option<String>,
+}
+
+/// Response DTO for complete hackathon setup
+#[derive(Clone, Debug, Serialize, Deserialize, ToSchema)]
+pub struct HackathonCompleteSetupResponseDto {
+    pub hackathon: HackathonDto,
+    pub timelines: Vec<super::hackathon_dto::HackathonTimelineDto>,
+    pub events: Option<Vec<super::hackathon_dto::HackathonEventDto>>,
+    pub message: String,
+}
+
+/// Service for atomic hackathon operations
+pub struct HackathonAtomicService;
+
+impl HackathonAtomicService {
+    /// Create hackathon with timeline and events atomically
+    /// This ensures all-or-nothing creation - if any step fails, nothing is created
+    pub async fn create_hackathon_complete(
+        payload: HackathonCompleteSetupRequestDto,
+        state: &AppState,
+    ) -> Result<ResponseSuccessDto<HackathonCompleteSetupResponseDto>, ErrorDto> {
+        // 1. Validate all inputs before any database operations
+        if let Err((_, error_message)) = imphnen_utils::validator::validate_request(&payload) {
+            return Err(ErrorDto {
+                status: StatusCode::BAD_REQUEST.as_u16(),
+                message: "Validation failed".to_string(),
+                details: Some(serde_json::json!({ "validation_errors": error_message })),
+            });
+        }
+
+        // 2. Validate dates
+        if let Err(e) = validate_dates(
+            &payload.hackathon.start_date,
+            &payload.hackathon.end_date,
+            &payload.hackathon.registration_deadline,
+        ) {
+            return Err(ErrorDto {
+                status: StatusCode::BAD_REQUEST.as_u16(),
+                message: e.to_string(),
+                details: None,
+            });
+        }
+
+        // 3. Validate organizers
+        if let Err(e) = validate_organizers(&payload.hackathon.organizers) {
+            return Err(ErrorDto {
+                status: StatusCode::BAD_REQUEST.as_u16(),
+                message: e.to_string(),
+                details: None,
+            });
+        }
+
+        // 4. Validate prizes if provided
+        if let Some(ref prizes) = payload.hackathon.prizes {
+            let prize_schemas: Vec<super::hackathon_schema::Prize> = prizes
+                .iter()
+                .map(|p| super::hackathon_schema::Prize {
+                    position: p.position,
+                    title: p.title.clone(),
+                    description: p.description.clone(),
+                    value: p.value.clone(),
+                })
+                .collect();
+                
+            if let Err(e) = validate_prizes(&prize_schemas) {
+                return Err(ErrorDto {
+                    status: StatusCode::BAD_REQUEST.as_u16(),
+                    message: e.to_string(),
+                    details: None,
+                });
+            }
+        }
+
+        // 5. Validate events count if provided
+        if let Some(ref events) = payload.events {
+            if events.len() > MAX_EVENTS_PER_HACKATHON {
+                return Err(ErrorDto {
+                    status: StatusCode::BAD_REQUEST.as_u16(),
+                    message: format!(
+                        "Maximum {} events allowed per hackathon",
+                        MAX_EVENTS_PER_HACKATHON
+                    ),
+                    details: None,
+                });
+            }
+        }
+
+        let repo = HackathonRepository::new(state);
+        let audit_repo = HackathonAuditRepository::new(state);
+
+        // 6. Create hackathon first
+        let hackathon = match repo.create_hackathon(payload.hackathon.clone()).await {
+            Ok(h) => h,
+            Err(e) => {
+                tracing::error!("Failed to create hackathon: {}", e);
+                return Err(ErrorDto {
+                    status: StatusCode::INTERNAL_SERVER_ERROR.as_u16(),
+                    message: "Failed to create hackathon".to_string(),
+                    details: Some(serde_json::json!({ "error": e.to_string() })),
+                });
+            }
+        };
+
+        let hackathon_id = hackathon.id.id.to_string();
+
+        // 7. Create timelines - if this fails, we should ideally rollback hackathon
+        let mut created_timelines = Vec::new();
+        for timeline_dto in &payload.timelines {
+            match repo.create_hackathon_timeline(hackathon_id.clone(), timeline_dto.clone()).await {
+                Ok(timeline) => created_timelines.push(timeline),
+                Err(e) => {
+                    tracing::error!("Failed to create timeline, attempting cleanup: {}", e);
+                    // Attempt to delete hackathon and created timelines
+                    let _ = Self::cleanup_failed_creation(
+                        &hackathon_id,
+                        &created_timelines.iter().map(|t| t.id.id.to_string()).collect::<Vec<_>>(),
+                        &[],
+                        &repo,
+                    )
+                    .await;
+
+                    return Err(ErrorDto {
+                        status: StatusCode::INTERNAL_SERVER_ERROR.as_u16(),
+                        message: "Failed to create timeline, changes rolled back".to_string(),
+                        details: Some(serde_json::json!({ "error": e.to_string() })),
+                    });
+                }
+            }
+        }
+
+        // 8. Validate timeline phases after all are created
+        if let Err(e) = validate_timeline_phases(&hackathon, &created_timelines) {
+            tracing::error!("Timeline validation failed, attempting cleanup: {}", e);
+            let _ = Self::cleanup_failed_creation(
+                &hackathon_id,
+                &created_timelines.iter().map(|t| t.id.id.to_string()).collect::<Vec<_>>(),
+                &[],
+                &repo,
+            )
+            .await;
+
+            return Err(ErrorDto {
+                status: StatusCode::BAD_REQUEST.as_u16(),
+                message: format!("Timeline validation failed: {}", e),
+                details: None,
+            });
+        }
+
+        // 9. Create events if provided
+        let mut created_events = Vec::new();
+        if let Some(ref events) = payload.events {
+            for event_dto in events {
+                match repo.create_hackathon_event(hackathon_id.clone(), event_dto.clone()).await {
+                    Ok(event) => created_events.push(event),
+                    Err(e) => {
+                        tracing::error!("Failed to create event, attempting cleanup: {}", e);
+                        let _ = Self::cleanup_failed_creation(
+                            &hackathon_id,
+                            &created_timelines.iter().map(|t| t.id.id.to_string()).collect::<Vec<_>>(),
+                            &created_events.iter().map(|e| e.id.id.to_string()).collect::<Vec<_>>(),
+                            &repo,
+                        )
+                        .await;
+
+                        return Err(ErrorDto {
+                            status: StatusCode::INTERNAL_SERVER_ERROR.as_u16(),
+                            message: "Failed to create event, changes rolled back".to_string(),
+                            details: Some(serde_json::json!({ "error": e.to_string() })),
+                        });
+                    }
+                }
+            }
+        }
+
+        // 10. Log audit trail
+        let audit_log = HackathonAuditLogSchema::new(
+            Some(hackathon.id.clone()),
+            AuditAction::HackathonCreated,
+            payload.actor_id.clone(),
+            "hackathon".to_string(),
+            Some(hackathon_id.clone()),
+        )
+        .with_changes(serde_json::to_value(&payload).unwrap_or_default())
+        .with_request_info(None, None, payload.actor_email.clone());
+
+        if let Err(e) = audit_repo.log(audit_log).await {
+            tracing::error!("Failed to create audit log: {}", e);
+            // Don't fail the request if audit logging fails
+        }
+
+        // 11. Return success response
+        let response = HackathonCompleteSetupResponseDto {
+            hackathon: super::hackathon_dto::HackathonDto::from(hackathon),
+            timelines: created_timelines
+                .into_iter()
+                .map(super::hackathon_dto::HackathonTimelineDto::from)
+                .collect(),
+            events: if created_events.is_empty() {
+                None
+            } else {
+                Some(
+                    created_events
+                        .into_iter()
+                        .map(super::hackathon_dto::HackathonEventDto::from)
+                        .collect(),
+                )
+            },
+            message: "Hackathon created successfully with timeline and events".to_string(),
+        };
+
+        Ok(ResponseSuccessDto { data: response })
+    }
+
+    /// Cleanup failed creation by deleting created resources
+    async fn cleanup_failed_creation(
+        hackathon_id: &str,
+        timeline_ids: &[String],
+        event_ids: &[String],
+        repo: &HackathonRepository<'_>,
+    ) -> Result<()> {
+        tracing::info!("Starting cleanup for failed hackathon creation");
+
+        // Delete events
+        for event_id in event_ids {
+            if let Err(e) = repo.delete_hackathon_event(event_id.to_string()).await {
+                tracing::error!("Failed to cleanup event {}: {}", event_id, e);
+            }
+        }
+
+        // Delete timelines
+        for timeline_id in timeline_ids {
+            if let Err(e) = repo.delete_hackathon_timeline(timeline_id.to_string()).await {
+                tracing::error!("Failed to cleanup timeline {}: {}", timeline_id, e);
+            }
+        }
+
+        // Delete hackathon
+        if let Err(e) = repo.delete_hackathon(hackathon_id.to_string()).await {
+            tracing::error!("Failed to cleanup hackathon {}: {}", hackathon_id, e);
+        }
+
+        tracing::info!("Cleanup completed");
+        Ok(())
+    }
+}

imphnen-hackathon/src/v1/hackathon/hackathon_audit_repository.rs

@@ -0,0 +1,193 @@
+use super::hackathon_audit_schema::{AuditAction, HackathonAuditLogSchema};
+use anyhow::Result;
+use imphnen_libs::{AppState, MetaRequestDto, ResponseListSuccessDto};
+use surrealdb::sql::Thing;
+use tracing::{info, instrument};
+
+#[derive(Clone)]
+pub struct HackathonAuditRepository<'a> {
+    pub state: &'a AppState,
+}
+
+impl<'a> HackathonAuditRepository<'a> {
+    pub fn new(state: &'a AppState) -> Self {
+        Self { state }
+    }
+
+    #[instrument(skip(self, log), err)]
+    pub async fn log(&self, log: HackathonAuditLogSchema) -> Result<HackathonAuditLogSchema> {
+        let table = "app_hackathon_audit_logs";
+        let id = log.id.id.to_string();
+
+        info!(
+            action = %log.action,
+            actor_id = %log.actor_id,
+            resource_type = %log.resource_type,
+            "Creating audit log entry"
+        );
+
+        let record: Option<HackathonAuditLogSchema> = self
+            .state
+            .surrealdb_ws
+            .create((table, id.clone()))
+            .content(log.clone())
+            .await?;
+
+        record.ok_or_else(|| anyhow::anyhow!("Failed to create audit log"))
+    }
+
+    #[instrument(skip(self), err)]
+    pub async fn get_logs_by_hackathon(
+        &self,
+        hackathon_id: &Thing,
+        meta: MetaRequestDto,
+    ) -> Result<ResponseListSuccessDto<Vec<HackathonAuditLogSchema>>> {
+        let table = "app_hackathon_audit_logs";
+        let page = meta.page.unwrap_or(1);
+        let per_page = meta.per_page.unwrap_or(50);
+        let start = (page - 1) * per_page;
+        
+        let condition = format!("hackathon_id = {}", hackathon_id);
+        
+        let query = format!(
+            "SELECT * FROM {} WHERE {} ORDER BY timestamp DESC LIMIT {} START {}",
+            table, condition, per_page, start
+        );
+        
+        let count_query = format!(
+            "SELECT count() as count FROM {} WHERE {} GROUP ALL",
+            table, condition
+        );
+
+        info!(query = %query, "Executing query to get audit logs");
+
+        let logs: Vec<HackathonAuditLogSchema> = self.state.surrealdb_ws.query(&query).await?.take(0)?;
+        let count_result: Vec<imphnen_entities::common_dto::CountResult> =
+            self.state.surrealdb_ws.query(&count_query).await?.take(0)?;
+
+        let total = count_result.first().map(|r| r.count).unwrap_or(0);
+
+        Ok(ResponseListSuccessDto {
+            data: logs,
+            meta: Some(imphnen_libs::MetaResponseDto {
+                page: Some(page),
+                per_page: Some(per_page),
+                total: Some(total),
+            }),
+        })
+    }
+
+    #[instrument(skip(self), err)]
+    pub async fn get_logs_by_actor(
+        &self,
+        actor_id: &str,
+        meta: MetaRequestDto,
+    ) -> Result<ResponseListSuccessDto<Vec<HackathonAuditLogSchema>>> {
+        let table = "app_hackathon_audit_logs";
+        let page = meta.page.unwrap_or(1);
+        let per_page = meta.per_page.unwrap_or(50);
+        let start = (page - 1) * per_page;
+        
+        let condition = format!("actor_id = '{}'", actor_id);
+        
+        let query = format!(
+            "SELECT * FROM {} WHERE {} ORDER BY timestamp DESC LIMIT {} START {}",
+            table, condition, per_page, start
+        );
+        
+        let count_query = format!(
+            "SELECT count() as count FROM {} WHERE {} GROUP ALL",
+            table, condition
+        );
+
+        let logs: Vec<HackathonAuditLogSchema> = self.state.surrealdb_ws.query(&query).await?.take(0)?;
+        let count_result: Vec<imphnen_entities::common_dto::CountResult> =
+            self.state.surrealdb_ws.query(&count_query).await?.take(0)?;
+
+        let total = count_result.first().map(|r| r.count).unwrap_or(0);
+
+        Ok(ResponseListSuccessDto {
+            data: logs,
+            meta: Some(imphnen_libs::MetaResponseDto {
+                page: Some(page),
+                per_page: Some(per_page),
+                total: Some(total),
+            }),
+        })
+    }
+
+    #[instrument(skip(self), err)]
+    pub async fn get_logs_by_action(
+        &self,
+        action: AuditAction,
+        meta: MetaRequestDto,
+    ) -> Result<ResponseListSuccessDto<Vec<HackathonAuditLogSchema>>> {
+        let table = "app_hackathon_audit_logs";
+        let page = meta.page.unwrap_or(1);
+        let per_page = meta.per_page.unwrap_or(50);
+        let start = (page - 1) * per_page;
+        
+        let condition = format!("action = '{}'", action.to_string());
+        
+        let query = format!(
+            "SELECT * FROM {} WHERE {} ORDER BY timestamp DESC LIMIT {} START {}",
+            table, condition, per_page, start
+        );
+        
+        let count_query = format!(
+            "SELECT count() as count FROM {} WHERE {} GROUP ALL",
+            table, condition
+        );
+
+        let logs: Vec<HackathonAuditLogSchema> = self.state.surrealdb_ws.query(&query).await?.take(0)?;
+        let count_result: Vec<imphnen_entities::common_dto::CountResult> =
+            self.state.surrealdb_ws.query(&count_query).await?.take(0)?;
+
+        let total = count_result.first().map(|r| r.count).unwrap_or(0);
+
+        Ok(ResponseListSuccessDto {
+            data: logs,
+            meta: Some(imphnen_libs::MetaResponseDto {
+                page: Some(page),
+                per_page: Some(per_page),
+                total: Some(total),
+            }),
+        })
+    }
+
+    #[instrument(skip(self), err)]
+    pub async fn get_all_logs(
+        &self,
+        meta: MetaRequestDto,
+    ) -> Result<ResponseListSuccessDto<Vec<HackathonAuditLogSchema>>> {
+        let table = "app_hackathon_audit_logs";
+        let page = meta.page.unwrap_or(1);
+        let per_page = meta.per_page.unwrap_or(50);
+        let start = (page - 1) * per_page;
+        
+        let query = format!(
+            "SELECT * FROM {} ORDER BY timestamp DESC LIMIT {} START {}",
+            table, per_page, start
+        );
+        
+        let count_query = format!(
+            "SELECT count() as count FROM {} GROUP ALL",
+            table
+        );
+
+        let logs: Vec<HackathonAuditLogSchema> = self.state.surrealdb_ws.query(&query).await?.take(0)?;
+        let count_result: Vec<imphnen_entities::common_dto::CountResult> =
+            self.state.surrealdb_ws.query(&count_query).await?.take(0)?;
+
+        let total = count_result.first().map(|r| r.count).unwrap_or(0);
+
+        Ok(ResponseListSuccessDto {
+            data: logs,
+            meta: Some(imphnen_libs::MetaResponseDto {
+                page: Some(page),
+                per_page: Some(per_page),
+                total: Some(total),
+            }),
+        })
+    }
+}

imphnen-hackathon/src/v1/hackathon/hackathon_audit_schema.rs

@@ -0,0 +1,164 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use surrealdb::sql::Thing;
+use imphnen_utils::{get_iso_date, make_thing};
+
+/// Audit log schema for tracking all hackathon-related changes
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct HackathonAuditLogSchema {
+    pub id: Thing,
+    pub hackathon_id: Option<Thing>,  // None for system-wide events
+    pub action: AuditAction,
+    pub actor_id: String,              // User who performed the action
+    pub actor_email: Option<String>,   // For better traceability
+    pub resource_type: String,         // hackathon, timeline, event, submission
+    pub resource_id: Option<String>,   // ID of the affected resource
+    pub changes: Option<serde_json::Value>,  // JSON of what changed
+    pub old_value: Option<serde_json::Value>,
+    pub new_value: Option<serde_json::Value>,
+    pub ip_address: Option<String>,
+    pub user_agent: Option<String>,
+    pub timestamp: DateTime<Utc>,
+    pub created_at: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
+pub enum AuditAction {
+    // Hackathon actions
+    HackathonCreated,
+    HackathonUpdated,
+    HackathonDeleted,
+    HackathonStatusChanged,
+    
+    // Timeline actions
+    TimelineCreated,
+    TimelineUpdated,
+    TimelineDeleted,
+    TimelineActivated,
+    
+    // Event actions
+    EventCreated,
+    EventUpdated,
+    EventDeleted,
+    
+    // Submission actions
+    SubmissionCreated,
+    SubmissionUpdated,
+    SubmissionDeleted,
+    SubmissionStatusChanged,
+    
+    // Participant actions
+    ParticipantRegistered,
+    ParticipantRemoved,
+    
+    // Organizer actions
+    OrganizerAdded,
+    OrganizerRemoved,
+}
+
+impl std::fmt::Display for AuditAction {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            AuditAction::HackathonCreated => write!(f, "hackathon_created"),
+            AuditAction::HackathonUpdated => write!(f, "hackathon_updated"),
+            AuditAction::HackathonDeleted => write!(f, "hackathon_deleted"),
+            AuditAction::HackathonStatusChanged => write!(f, "hackathon_status_changed"),
+            AuditAction::TimelineCreated => write!(f, "timeline_created"),
+            AuditAction::TimelineUpdated => write!(f, "timeline_updated"),
+            AuditAction::TimelineDeleted => write!(f, "timeline_deleted"),
+            AuditAction::TimelineActivated => write!(f, "timeline_activated"),
+            AuditAction::EventCreated => write!(f, "event_created"),
+            AuditAction::EventUpdated => write!(f, "event_updated"),
+            AuditAction::EventDeleted => write!(f, "event_deleted"),
+            AuditAction::SubmissionCreated => write!(f, "submission_created"),
+            AuditAction::SubmissionUpdated => write!(f, "submission_updated"),
+            AuditAction::SubmissionDeleted => write!(f, "submission_deleted"),
+            AuditAction::SubmissionStatusChanged => write!(f, "submission_status_changed"),
+            AuditAction::ParticipantRegistered => write!(f, "participant_registered"),
+            AuditAction::ParticipantRemoved => write!(f, "participant_removed"),
+            AuditAction::OrganizerAdded => write!(f, "organizer_added"),
+            AuditAction::OrganizerRemoved => write!(f, "organizer_removed"),
+        }
+    }
+}
+
+impl Default for HackathonAuditLogSchema {
+    fn default() -> Self {
+        Self {
+            id: make_thing(
+                "app_hackathon_audit_logs",
+                &surrealdb::Uuid::new_v4().to_string(),
+            ),
+            hackathon_id: None,
+            action: AuditAction::HackathonCreated,
+            actor_id: String::new(),
+            actor_email: None,
+            resource_type: String::new(),
+            resource_id: None,
+            changes: None,
+            old_value: None,
+            new_value: None,
+            ip_address: None,
+            user_agent: None,
+            timestamp: Utc::now(),
+            created_at: get_iso_date(),
+        }
+    }
+}
+
+impl HackathonAuditLogSchema {
+    pub fn new(
+        hackathon_id: Option<Thing>,
+        action: AuditAction,
+        actor_id: String,
+        resource_type: String,
+        resource_id: Option<String>,
+    ) -> Self {
+        Self {
+            id: make_thing(
+                "app_hackathon_audit_logs",
+                &surrealdb::Uuid::new_v4().to_string(),
+            ),
+            hackathon_id,
+            action,
+            actor_id,
+            actor_email: None,
+            resource_type,
+            resource_id,
+            changes: None,
+            old_value: None,
+            new_value: None,
+            ip_address: None,
+            user_agent: None,
+            timestamp: Utc::now(),
+            created_at: get_iso_date(),
+        }
+    }
+
+    pub fn with_changes(mut self, changes: serde_json::Value) -> Self {
+        self.changes = Some(changes);
+        self
+    }
+
+    pub fn with_old_new_values(
+        mut self,
+        old_value: serde_json::Value,
+        new_value: serde_json::Value,
+    ) -> Self {
+        self.old_value = Some(old_value);
+        self.new_value = Some(new_value);
+        self
+    }
+
+    pub fn with_request_info(
+        mut self,
+        ip_address: Option<String>,
+        user_agent: Option<String>,
+        actor_email: Option<String>,
+    ) -> Self {
+        self.ip_address = ip_address;
+        self.user_agent = user_agent;
+        self.actor_email = actor_email;
+        self
+    }
+}

imphnen-hackathon/src/v1/hackathon/hackathon_controller.rs

@@ -4,19 +4,21 @@ use super::hackathon_dto::{
     HackathonEventUpdateRequestDto, HackathonSubmissionCreateRequestDto,
     HackathonSubmissionDto, HackathonSubmissionUpdateRequestDto, HackathonTimelineCreateRequestDto,
     HackathonTimelineDto, HackathonTimelineUpdateRequestDto, HackathonUpdateRequestDto,
+    HackathonStatusChangeRequestDto,
 };
 use super::hackathon_service::{HackathonService, HackathonServiceTrait};
 use super::hackathon_schema::SubmissionStatus;
+use super::hackathon_atomic_service::{HackathonAtomicService, HackathonCompleteSetupRequestDto, HackathonCompleteSetupResponseDto};
 use crate::v1::hackathon::HackathonRepository;
 use crate::{AppState, ResponseSuccessDto, ErrorDto};
 use imphnen_entities::{PermissionsEnum, UsersDetailQueryDto};
-use imphnen_libs::{MetaRequestDto, ResponseListSuccessDto};
+use imphnen_libs::{MetaRequestDto, ResponseListSuccessDto, jsonwebtoken::Claims};
 use axum::{
     extract::{Extension, Path, Query},
     http::StatusCode,
     Json, Router,
     response::IntoResponse,
-    routing::{delete, get, post, put},
+    routing::{delete, get, patch, post, put},
 };
 use axum::body::Bytes;
 use futures::future;
@@ -1066,14 +1068,158 @@ pub async fn post_admin_manage_sensitive_data(
     Ok((StatusCode::OK, Json(response)).into_response())
 }
 
-pub fn hackathon_routes() -> Router {
-    // AppState would be properly injected in real usage via Axum's state management
-    // For now, we'll create routes without middleware that requires AppState
+// Atomic hackathon creation with timeline and events
+#[utoipa::path(
+    post,
+    security(
+        ("Bearer" = [])
+    ),
+    path = "/v1/hackathons/complete",
+    request_body = HackathonCompleteSetupRequestDto,
+    responses(
+        (status = 201, description = "[ADMIN] Hackathon created atomically with timeline and events", body = ResponseSuccessDto<HackathonCompleteSetupResponseDto>),
+        (status = 400, description = "[ADMIN] Bad request or validation failed", body = ErrorDto),
+        (status = 403, description = "[ADMIN] Forbidden", body = ErrorDto),
+        (status = 500, description = "[ADMIN] Internal server error, changes rolled back", body = ErrorDto)
+    ),
+    tag = "Hackathons"
+)]
+pub async fn create_hackathon_complete(
+    _headers: HeaderMap,
+    Extension(state): Extension<AppState>,
+    Json(payload): Json<HackathonCompleteSetupRequestDto>,
+) -> impl IntoResponse {
+    match HackathonAtomicService::create_hackathon_complete(payload, &state).await {
+        Ok(response) => {
+            (axum::http::StatusCode::CREATED, Json(serde_json::json!({
+                "message": "Hackathon created successfully with timeline and events",
+                "data": response.data
+            }))).into_response()
+        }
+        Err(error) => (StatusCode::from_u16(error.status).unwrap(), Json(error)).into_response(),
+    }
+}
 
+// Change hackathon status with validation
+#[utoipa::path(
+    patch,
+    security(
+        ("Bearer" = [])
+    ),
+    path = "/v1/hackathons/{id}/status",
+    params(
+        ("id" = String, Path, description = "Hackathon ID")
+    ),
+    request_body = HackathonStatusChangeRequestDto,
+    responses(
+        (status = 200, description = "[ADMIN] Status changed successfully", body = ResponseSuccessDto<HackathonDto>),
+        (status = 400, description = "[ADMIN] Invalid status transition", body = ErrorDto),
+        (status = 403, description = "[ADMIN] Forbidden", body = ErrorDto),
+        (status = 404, description = "[ADMIN] Hackathon not found", body = ErrorDto),
+        (status = 500, description = "[ADMIN] Internal server error", body = ErrorDto)
+    ),
+    tag = "Hackathons"
+)]
+pub async fn change_hackathon_status(
+    _headers: HeaderMap,
+    Extension(state): Extension<AppState>,
+    Path(id): Path<String>,
+    Json(payload): Json<HackathonStatusChangeRequestDto>,
+) -> impl IntoResponse {
+    use super::hackathon_validation::{can_transition_status, validate_ready_for_registration};
+    use super::hackathon_audit_schema::{AuditAction, HackathonAuditLogSchema};
+    use super::hackathon_audit_repository::HackathonAuditRepository;
+    
+    let repo = HackathonRepository::new(&state);
+    let audit_repo = HackathonAuditRepository::new(&state);
+    
+    // Get existing hackathon
+    let existing = match repo.get_hackathon_by_id(id.clone()).await {
+        Ok(h) => h,
+        Err(_) => {
+            return (StatusCode::NOT_FOUND, Json(ErrorDto {
+                status: StatusCode::NOT_FOUND.as_u16(),
+                message: "Hackathon not found".to_string(),
+                details: None,
+            })).into_response();
+        }
+    };
+    
+    // Validate status transition
+    if let Err(e) = can_transition_status(&existing.status, &payload.status) {
+        return (StatusCode::BAD_REQUEST, Json(ErrorDto {
+            status: StatusCode::BAD_REQUEST.as_u16(),
+            message: e.to_string(),
+            details: None,
+        })).into_response();
+    }
+    
+    // Additional validation for RegistrationOpen
+    if payload.status == super::hackathon_schema::HackathonStatus::RegistrationOpen {
+        if let Err(e) = validate_ready_for_registration(&existing) {
+            return (StatusCode::BAD_REQUEST, Json(ErrorDto {
+                status: StatusCode::BAD_REQUEST.as_u16(),
+                message: format!("Cannot open registration: {}", e),
+                details: None,
+            })).into_response();
+        }
+    }
+    
+    // Update status
+    let update_dto = HackathonUpdateRequestDto {
+        name: None,
+        description: None,
+        start_date: None,
+        end_date: None,
+        registration_deadline: None,
+        max_participants: None,
+        theme: None,
+        rules: None,
+        prizes: None,
+        previous_winners: None,
+        organizers: None,
+    };
+    
+    // Manually update status in repository
+    let updated = match repo.update_hackathon_status(id.clone(), payload.status.clone()).await {
+        Ok(h) => h,
+        Err(e) => {
+            return (StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorDto {
+                status: StatusCode::INTERNAL_SERVER_ERROR.as_u16(),
+                message: format!("Failed to update status: {}", e),
+                details: None,
+            })).into_response();
+        }
+    };
+    
+    // Create audit log
+    let old_value = serde_json::json!({"status": existing.status});
+    let new_value = serde_json::json!({"status": payload.status, "reason": payload.reason});
+    
+    let audit_log = HackathonAuditLogSchema::new(
+        Some(updated.id.clone()),
+        AuditAction::HackathonStatusChanged,
+        payload.actor_id.unwrap_or_else(|| "system".to_string()),
+        "hackathon".to_string(),
+        Some(id),
+    )
+    .with_old_new_values(old_value, new_value);
+    
+    if let Err(e) = audit_repo.log(audit_log).await {
+        tracing::error!("Failed to create audit log: {}", e);
+    }
+    
+    let dto = HackathonDto::from(updated);
+    (StatusCode::OK, Json(ResponseSuccessDto { data: dto })).into_response()
+}
+
+pub fn hackathon_routes() -> Router {
     Router::new()
-            // Hackathon routes - simplified for compilation
+            // Hackathon routes
             .route("/", post(create_hackathon))
+            .route("/complete", post(create_hackathon_complete))
             .route("/{id}", put(update_hackathon))
+            .route("/{id}/status", patch(change_hackathon_status))
             .route("/{id}", delete(delete_hackathon))
 
             // Hackathon Events routes

imphnen-hackathon/src/v1/hackathon/hackathon_dto.rs

@@ -618,4 +618,13 @@ pub struct AdminSensitiveDataDto {
 pub struct AdminSensitiveDataResponseDto {
     pub data: Vec<AdminSensitiveDataDto>,
     pub message: String,
-}
+}
+// Status Change DTOs
+#[derive(Clone, Debug, Serialize, Deserialize, ToSchema, Validate)]
+pub struct HackathonStatusChangeRequestDto {
+    pub status: HackathonStatus,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reason: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub actor_id: Option<String>,
+}

imphnen-hackathon/src/v1/hackathon/hackathon_repository.rs

@@ -246,6 +246,31 @@ impl<'a> HackathonRepository<'a> {
             None => bail!("Failed to delete hackathon"),
         }
     }
+
+    #[instrument(skip(self, id, status), err)]
+    pub async fn update_hackathon_status(&self, id: String, status: super::hackathon_schema::HackathonStatus) -> Result<HackathonSchema> {
+        let table = ResourceEnum::Hackathons.to_string();
+
+        // Get existing hackathon
+        let mut existing = self.get_hackathon_by_id(id.clone()).await?;
+
+        // Update status
+        existing.status = status;
+        existing.updated_at = Some(get_iso_date());
+
+        info!(query = %format!("UPDATE {} SET status = {:?} WHERE id = '{}'", table, existing.status, id), "Executing SurrealDB query");
+        let normalized_id = self.normalize_id(&table, &id);
+        let record: Option<HackathonSchema> = self
+            .state.surrealdb_ws
+            .update((table, normalized_id))
+            .content(existing.clone())
+            .await?;
+
+        match record {
+            Some(h) => Ok(h),
+            None => bail!("Failed to update hackathon status"),
+        }
+    }
 }
 
 // Hackathon Events CRUD operations

imphnen-hackathon/src/v1/hackathon/hackathon_service.rs

@@ -11,6 +11,13 @@ use super::hackathon_dto::{
 };
 use super::hackathon_repository::HackathonRepository;
 use super::hackathon_schema::SubmissionStatus;
+use super::hackathon_audit_schema::{AuditAction, HackathonAuditLogSchema};
+use super::hackathon_audit_repository::HackathonAuditRepository;
+use super::hackathon_validation::{
+    can_transition_status, validate_dates, validate_organizers, 
+    validate_prizes, validate_ready_for_registration, validate_timeline_phases,
+    validate_can_delete, validate_registration_allowed, validate_submission_allowed,
+};
 use crate::{AppState, ResponseSuccessDto, ErrorDto};
 use imphnen_utils::{validator::validate_request};
 use imphnen_libs::{MetaRequestDto, ResponseListSuccessDto};
@@ -156,7 +163,7 @@ impl HackathonServiceTrait for HackathonService {
         
         let state = state.to_owned();
         Box::pin(async move {
-            // Validate request
+            // 1. Validate request input
             if let Err((_, error_message)) = validate_request(&payload) {
                 return Err(ErrorDto {
                     status: StatusCode::BAD_REQUEST.as_u16(),
@@ -165,38 +172,70 @@ impl HackathonServiceTrait for HackathonService {
                 });
             }
 
-            // Business logic validation
-            if payload.end_date <= payload.start_date {
+            // 2. Validate dates consistency
+            if let Err(e) = validate_dates(
+                &payload.start_date,
+                &payload.end_date,
+                &payload.registration_deadline,
+            ) {
                 return Err(ErrorDto {
                     status: StatusCode::BAD_REQUEST.as_u16(),
-                    message: "End date must be after start date".to_string(),
+                    message: e.to_string(),
                     details: None,
                 });
             }
 
-            // Registration deadline should be before the hackathon end date (allowing registration up
-            // to the start of or during the hackathon depending on business rules). Tests in this
-            // repository set the deadline between start and end, so validate against end_date here.
-            if payload.registration_deadline >= payload.end_date {
+            // 3. Validate organizers
+            if let Err(e) = validate_organizers(&payload.organizers) {
                 return Err(ErrorDto {
                     status: StatusCode::BAD_REQUEST.as_u16(),
-                    message: "Registration deadline must be before end date".to_string(),
+                    message: e.to_string(),
                     details: None,
                 });
             }
 
-            if payload.organizers.is_empty() {
-                return Err(ErrorDto {
-                    status: StatusCode::BAD_REQUEST.as_u16(),
-                    message: "At least one organizer is required".to_string(),
-                    details: None,
-                });
+            // 4. Validate prizes if provided
+            if let Some(ref prizes) = payload.prizes {
+                let prize_schemas: Vec<super::hackathon_schema::Prize> = prizes
+                    .iter()
+                    .map(|p| super::hackathon_schema::Prize {
+                        position: p.position,
+                        title: p.title.clone(),
+                        description: p.description.clone(),
+                        value: p.value.clone(),
+                    })
+                    .collect();
+                    
+                if let Err(e) = validate_prizes(&prize_schemas) {
+                    return Err(ErrorDto {
+                        status: StatusCode::BAD_REQUEST.as_u16(),
+                        message: e.to_string(),
+                        details: None,
+                    });
+                }
             }
 
             let repo = HackathonRepository::new(&state);
+            let audit_repo = HackathonAuditRepository::new(&state);
 
-            match repo.create_hackathon(payload).await {
+            // 5. Create hackathon
+            match repo.create_hackathon(payload.clone()).await {
                 Ok(hackathon) => {
+                    // 6. Create audit log
+                    let audit_log = HackathonAuditLogSchema::new(
+                        Some(hackathon.id.clone()),
+                        AuditAction::HackathonCreated,
+                        payload.organizers.first().unwrap_or(&"system".to_string()).clone(),
+                        "hackathon".to_string(),
+                        Some(hackathon.id.id.to_string()),
+                    )
+                    .with_changes(serde_json::to_value(&hackathon).unwrap_or_default());
+
+                    if let Err(e) = audit_repo.log(audit_log).await {
+                        tracing::error!("Failed to create audit log: {}", e);
+                        // Don't fail the request if audit logging fails
+                    }
+
                     let dto = HackathonDto::from(hackathon);
                     Ok(ResponseSuccessDto { data: dto })
                 }
@@ -273,7 +312,7 @@ impl HackathonServiceTrait for HackathonService {
         
         let state = state.to_owned();
         Box::pin(async move {
-            // Validate request
+            // 1. Validate request
             if let Err(errors) = validate_request(&payload) {
                 return Err(ErrorDto {
                     status: StatusCode::BAD_REQUEST.as_u16(),
@@ -283,8 +322,9 @@ impl HackathonServiceTrait for HackathonService {
             }
 
             let repo = HackathonRepository::new(&state);
+            let audit_repo = HackathonAuditRepository::new(&state);
 
-            // Get existing hackathon for validation
+            // 2. Get existing hackathon for validation
             let existing = match repo.get_hackathon_by_id(id.clone()).await {
                 Ok(h) => h,
                 Err(_) => {
@@ -296,30 +336,75 @@ impl HackathonServiceTrait for HackathonService {
                 }
             };
 
-            // Business logic validation
+            // 3. Validate dates consistency
             let start_date = payload.start_date.unwrap_or(existing.start_date);
             let end_date = payload.end_date.unwrap_or(existing.end_date);
             let registration_deadline = payload.registration_deadline.unwrap_or(existing.registration_deadline);
 
-            if end_date <= start_date {
+            if let Err(e) = validate_dates(&start_date, &end_date, &registration_deadline) {
                 return Err(ErrorDto {
                     status: StatusCode::BAD_REQUEST.as_u16(),
-                    message: "End date must be after start date".to_string(),
+                    message: e.to_string(),
                     details: None,
                 });
             }
 
-            // Same rule as create_hackathon: the registration deadline must be before the end date.
-            if registration_deadline >= end_date {
-                return Err(ErrorDto {
-                    status: StatusCode::BAD_REQUEST.as_u16(),
-                    message: "Registration deadline must be before end date".to_string(),
-                    details: None,
-                });
+            // 4. Validate organizers if being updated
+            if let Some(ref organizers) = payload.organizers {
+                if let Err(e) = validate_organizers(organizers) {
+                    return Err(ErrorDto {
+                        status: StatusCode::BAD_REQUEST.as_u16(),
+                        message: e.to_string(),
+                        details: None,
+                    });
+                }
             }
 
-            match repo.update_hackathon(id, payload).await {
+            // 5. Validate prizes if being updated
+            if let Some(ref prizes) = payload.prizes {
+                let prize_schemas: Vec<super::hackathon_schema::Prize> = prizes
+                    .iter()
+                    .map(|p| super::hackathon_schema::Prize {
+                        position: p.position,
+                        title: p.title.clone(),
+                        description: p.description.clone(),
+                        value: p.value.clone(),
+                    })
+                    .collect();
+                    
+                if let Err(e) = validate_prizes(&prize_schemas) {
+                    return Err(ErrorDto {
+                        status: StatusCode::BAD_REQUEST.as_u16(),
+                        message: e.to_string(),
+                        details: None,
+                    });
+                }
+            }
+
+            // 6. Store old value for audit log
+            let old_value = serde_json::to_value(&existing).unwrap_or_default();
+
+            // 7. Update hackathon
+            match repo.update_hackathon(id.clone(), payload.clone()).await {
                 Ok(hackathon) => {
+                    // 8. Create audit log
+                    let new_value = serde_json::to_value(&hackathon).unwrap_or_default();
+                    let changes = serde_json::to_value(&payload).unwrap_or_default();
+
+                    let audit_log = HackathonAuditLogSchema::new(
+                        Some(hackathon.id.clone()),
+                        AuditAction::HackathonUpdated,
+                        existing.organizers.first().unwrap_or(&"system".to_string()).clone(),
+                        "hackathon".to_string(),
+                        Some(id),
+                    )
+                    .with_changes(changes)
+                    .with_old_new_values(old_value, new_value);
+
+                    if let Err(e) = audit_repo.log(audit_log).await {
+                        tracing::error!("Failed to create audit log: {}", e);
+                    }
+
                     let dto = HackathonDto::from(hackathon);
                     Ok(ResponseSuccessDto { data: dto })
                 }

imphnen-hackathon/src/v1/hackathon/hackathon_validation.rs

@@ -0,0 +1,340 @@
+use super::hackathon_schema::{HackathonSchema, HackathonStatus, HackathonTimelineSchema, HackathonPhase};
+use anyhow::{Result, bail};
+use std::collections::HashSet;
+use chrono::Utc;
+
+/// Validation rules for hackathon operations
+
+// Constants for limits
+pub const MAX_ORGANIZERS: usize = 20;
+pub const MAX_TIMELINES: usize = 10;
+pub const MAX_EVENTS_PER_HACKATHON: usize = 50;
+pub const MAX_PRIZES: usize = 20;
+pub const MIN_TEAM_SIZE: u32 = 2;
+pub const MAX_TEAM_SIZE: u32 = 10;
+
+/// Validate status transition
+pub fn can_transition_status(
+    current: &HackathonStatus,
+    next: &HackathonStatus,
+) -> Result<()> {
+    use HackathonStatus::*;
+    
+    let allowed_transitions: Vec<HackathonStatus> = match current {
+        Draft => vec![RegistrationOpen, Cancelled],
+        RegistrationOpen => vec![RegistrationClosed, Cancelled],
+        RegistrationClosed => vec![InProgress, RegistrationOpen, Cancelled], // Allow reopen
+        InProgress => vec![Judging, Cancelled],
+        Judging => vec![Completed, Cancelled],
+        Completed => vec![], // Terminal state
+        Cancelled => vec![], // Terminal state
+    };
+    
+    if allowed_transitions.contains(next) {
+        Ok(())
+    } else {
+        bail!(
+            "Invalid status transition: {:?} -> {:?}. Allowed transitions from {:?} are: {:?}",
+            current,
+            next,
+            current,
+            allowed_transitions
+        )
+    }
+}
+
+/// Validate hackathon is ready for registration
+pub fn validate_ready_for_registration(hackathon: &HackathonSchema) -> Result<()> {
+    // Check required fields for registration
+    if hackathon.theme.is_none() || hackathon.theme.as_ref().unwrap().trim().is_empty() {
+        bail!("Theme is required before opening registration");
+    }
+    
+    if hackathon.rules.is_none() || hackathon.rules.as_ref().unwrap().trim().is_empty() {
+        bail!("Rules are required before opening registration");
+    }
+    
+    if hackathon.prizes.is_none() || hackathon.prizes.as_ref().unwrap().is_empty() {
+        bail!("At least one prize is required before opening registration");
+    }
+    
+    if hackathon.organizers.is_empty() {
+        bail!("At least one organizer is required");
+    }
+    
+    // Check dates are valid
+    let now = Utc::now();
+    if hackathon.registration_deadline < now {
+        bail!("Registration deadline must be in the future");
+    }
+    
+    if hackathon.start_date < now {
+        bail!("Start date must be in the future");
+    }
+    
+    Ok(())
+}
+
+/// Validate timeline phases
+pub fn validate_timeline_phases(
+    hackathon: &HackathonSchema,
+    timelines: &[HackathonTimelineSchema],
+) -> Result<()> {
+    if timelines.is_empty() {
+        bail!("At least one timeline phase is required");
+    }
+    
+    if timelines.len() > MAX_TIMELINES {
+        bail!("Maximum {} timeline phases allowed", MAX_TIMELINES);
+    }
+    
+    // Check required phases exist
+    let phases: Vec<HackathonPhase> = timelines.iter().map(|t| t.phase.clone()).collect();
+    
+    if !phases.contains(&HackathonPhase::Registration) {
+        bail!("Registration phase is required");
+    }
+    
+    if !phases.contains(&HackathonPhase::Submission) {
+        bail!("Submission phase is required");
+    }
+    
+    // Check for duplicate phases
+    let unique_phases: HashSet<String> = timelines.iter()
+        .map(|t| t.phase.to_string())
+        .collect();
+    if unique_phases.len() != timelines.len() {
+        bail!("Duplicate timeline phases found");
+    }
+    
+    // Check order is sequential
+    let mut orders: Vec<u32> = timelines.iter().map(|t| t.order).collect();
+    orders.sort();
+    for (i, &order) in orders.iter().enumerate() {
+        if order != i as u32 {
+            bail!("Timeline phases must have sequential order (expected {}, got {})", i, order);
+        }
+    }
+    
+    // Check for overlapping timelines
+    let mut sorted_timelines = timelines.to_vec();
+    sorted_timelines.sort_by(|a, b| a.start_date.cmp(&b.start_date));
+    
+    for i in 0..sorted_timelines.len() - 1 {
+        if sorted_timelines[i].end_date > sorted_timelines[i + 1].start_date {
+            bail!(
+                "Timeline phases cannot overlap: '{}' (ends {}) overlaps with '{}' (starts {})",
+                sorted_timelines[i].title,
+                sorted_timelines[i].end_date,
+                sorted_timelines[i + 1].title,
+                sorted_timelines[i + 1].start_date
+            );
+        }
+    }
+    
+    // Check timeline covers entire hackathon duration
+    let first = sorted_timelines.first().unwrap();
+    let last = sorted_timelines.last().unwrap();
+    
+    // Allow small tolerance (1 hour) for timezone differences
+    let tolerance = chrono::Duration::hours(1);
+    
+    if (first.start_date - hackathon.start_date).abs() > tolerance {
+        bail!(
+            "Timeline must start at hackathon start date (Timeline: {}, Hackathon: {})",
+            first.start_date,
+            hackathon.start_date
+        );
+    }
+    
+    if (last.end_date - hackathon.end_date).abs() > tolerance {
+        bail!(
+            "Timeline must end at hackathon end date (Timeline: {}, Hackathon: {})",
+            last.end_date,
+            hackathon.end_date
+        );
+    }
+    
+    // Check only one timeline is active
+    let active_count = timelines.iter().filter(|t| t.is_active).count();
+    if active_count > 1 {
+        bail!("Only one timeline phase can be active at a time");
+    }
+    
+    Ok(())
+}
+
+/// Validate organizers list
+pub fn validate_organizers(organizers: &[String]) -> Result<()> {
+    if organizers.is_empty() {
+        bail!("At least one organizer is required");
+    }
+    
+    if organizers.len() > MAX_ORGANIZERS {
+        bail!("Maximum {} organizers allowed", MAX_ORGANIZERS);
+    }
+    
+    // Check for duplicates
+    let unique: HashSet<&String> = organizers.iter().collect();
+    if unique.len() != organizers.len() {
+        bail!("Duplicate organizers found");
+    }
+    
+    // Check for empty or invalid IDs
+    for organizer in organizers {
+        if organizer.trim().is_empty() {
+            bail!("Organizer ID cannot be empty");
+        }
+    }
+    
+    Ok(())
+}
+
+/// Validate prizes
+pub fn validate_prizes(prizes: &[super::hackathon_schema::Prize]) -> Result<()> {
+    if prizes.is_empty() {
+        bail!("At least one prize is required");
+    }
+    
+    if prizes.len() > MAX_PRIZES {
+        bail!("Maximum {} prizes allowed", MAX_PRIZES);
+    }
+    
+    // Check for duplicate positions
+    let positions: Vec<u32> = prizes.iter().map(|p| p.position).collect();
+    let unique_positions: HashSet<u32> = positions.iter().copied().collect();
+    if unique_positions.len() != positions.len() {
+        bail!("Duplicate prize positions found");
+    }
+    
+    // Check positions are valid (starting from 1)
+    for prize in prizes {
+        if prize.position == 0 {
+            bail!("Prize position must start from 1");
+        }
+        if prize.title.trim().is_empty() {
+            bail!("Prize title cannot be empty");
+        }
+    }
+    
+    Ok(())
+}
+
+/// Validate dates consistency
+pub fn validate_dates(
+    start_date: &chrono::DateTime<Utc>,
+    end_date: &chrono::DateTime<Utc>,
+    registration_deadline: &chrono::DateTime<Utc>,
+) -> Result<()> {
+    if end_date <= start_date {
+        bail!("End date must be after start date");
+    }
+    
+    if registration_deadline >= end_date {
+        bail!("Registration deadline must be before end date");
+    }
+    
+    // Registration deadline should ideally be before or at start date
+    if registration_deadline > start_date {
+        // Allow but warn - some hackathons allow registration during event
+        tracing::warn!(
+            "Registration deadline ({}) is after start date ({})",
+            registration_deadline,
+            start_date
+        );
+    }
+    
+    Ok(())
+}
+
+/// Validate hackathon can be deleted
+pub fn validate_can_delete(hackathon: &HackathonSchema) -> Result<()> {
+    // Cannot delete completed hackathons (for historical records)
+    if hackathon.status == HackathonStatus::Completed {
+        bail!("Cannot delete completed hackathons. They are kept for historical records.");
+    }
+    
+    Ok(())
+}
+
+/// Get current active phase based on timeline
+pub fn get_current_phase(timelines: &[HackathonTimelineSchema]) -> Option<HackathonPhase> {
+    let now = Utc::now();
+    
+    // Find the timeline that contains current time
+    for timeline in timelines {
+        if timeline.start_date <= now && timeline.end_date >= now {
+            return Some(timeline.phase.clone());
+        }
+    }
+    
+    None
+}
+
+/// Validate submission is allowed in current phase
+pub fn validate_submission_allowed(timelines: &[HackathonTimelineSchema]) -> Result<()> {
+    let current_phase = get_current_phase(timelines);
+    
+    match current_phase {
+        Some(HackathonPhase::Submission) => Ok(()),
+        Some(phase) => bail!("Submissions are not allowed in {:?} phase", phase),
+        None => bail!("No active phase found"),
+    }
+}
+
+/// Validate registration is allowed
+pub fn validate_registration_allowed(
+    hackathon: &HackathonSchema,
+    current_participant_count: u32,
+) -> Result<()> {
+    // Check status
+    if hackathon.status != HackathonStatus::RegistrationOpen {
+        bail!("Registration is not open for this hackathon");
+    }
+    
+    // Check deadline
+    let now = Utc::now();
+    if hackathon.registration_deadline < now {
+        bail!("Registration deadline has passed");
+    }
+    
+    // Check max participants
+    if let Some(max) = hackathon.max_participants {
+        if current_participant_count >= max {
+            bail!("Maximum participant limit reached");
+        }
+    }
+    
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use chrono::Duration;
+
+    #[test]
+    fn test_status_transitions() {
+        assert!(can_transition_status(&HackathonStatus::Draft, &HackathonStatus::RegistrationOpen).is_ok());
+        assert!(can_transition_status(&HackathonStatus::Draft, &HackathonStatus::Completed).is_err());
+        assert!(can_transition_status(&HackathonStatus::Completed, &HackathonStatus::Draft).is_err());
+    }
+
+    #[test]
+    fn test_validate_organizers() {
+        assert!(validate_organizers(&vec!["org1".to_string()]).is_ok());
+        assert!(validate_organizers(&vec![]).is_err());
+        assert!(validate_organizers(&vec!["org1".to_string(), "org1".to_string()]).is_err());
+    }
+
+    #[test]
+    fn test_validate_dates() {
+        let now = Utc::now();
+        let start = now + Duration::days(1);
+        let end = now + Duration::days(7);
+        let deadline = now + Duration::hours(12);
+        
+        assert!(validate_dates(&start, &end, &deadline).is_ok());
+        assert!(validate_dates(&end, &start, &deadline).is_err()); // end before start
+    }
+}

imphnen-hackathon/src/v1/hackathon/mod.rs

@@ -5,12 +5,20 @@ pub mod hackathon_dto;
 pub mod hackathon_repository;
 pub mod hackathon_schema;
 pub mod hackathon_service;
+pub mod hackathon_audit_schema;
+pub mod hackathon_audit_repository;
+pub mod hackathon_validation;
+pub mod hackathon_atomic_service;
 
 // Export types and functions
 pub use hackathon_dto::*;
 pub use hackathon_repository::HackathonRepository;
 pub use hackathon_schema::*;
 pub use hackathon_service::{HackathonService, HackathonServiceTrait};
+pub use hackathon_audit_schema::*;
+pub use hackathon_audit_repository::HackathonAuditRepository;
+pub use hackathon_validation::*;
+pub use hackathon_atomic_service::*;
 
 // Export controller functions
 pub use hackathon_controller::*;