diff --git a/backend/ent/schema/announcement.go b/backend/ent/schema/announcement.go
index 3b534831..1568778f 100644
--- a/backend/ent/schema/announcement.go
+++ b/backend/ent/schema/announcement.go
@@ -88,4 +88,3 @@ func (Announcement) Indexes() []ent.Index {
 		index.Fields("ends_at"),
 	}
 }
-
diff --git a/backend/ent/schema/announcement_read.go b/backend/ent/schema/announcement_read.go
index 2f80d8b2..e0b50777 100644
--- a/backend/ent/schema/announcement_read.go
+++ b/backend/ent/schema/announcement_read.go
@@ -63,4 +63,3 @@ func (AnnouncementRead) Indexes() []ent.Index {
 		index.Fields("announcement_id", "user_id").Unique(),
 	}
 }
-
diff --git a/backend/internal/handler/admin/announcement_handler.go b/backend/internal/handler/admin/announcement_handler.go
index a4e9f2f0..0b5d0fbc 100644
--- a/backend/internal/handler/admin/announcement_handler.go
+++ b/backend/internal/handler/admin/announcement_handler.go
@@ -27,12 +27,12 @@ func NewAnnouncementHandler(announcementService *service.AnnouncementService) *A
 }
 
 type CreateAnnouncementRequest struct {
-	Title     string                       `json:"title" binding:"required"`
-	Content   string                       `json:"content" binding:"required"`
-	Status    string                       `json:"status" binding:"omitempty,oneof=draft active archived"`
+	Title     string                        `json:"title" binding:"required"`
+	Content   string                        `json:"content" binding:"required"`
+	Status    string                        `json:"status" binding:"omitempty,oneof=draft active archived"`
 	Targeting service.AnnouncementTargeting `json:"targeting"`
-	StartsAt  *int64                       `json:"starts_at"` // Unix seconds, 0/empty = immediate
-	EndsAt    *int64                       `json:"ends_at"`   // Unix seconds, 0/empty = never
+	StartsAt  *int64                        `json:"starts_at"` // Unix seconds, 0/empty = immediate
+	EndsAt    *int64                        `json:"ends_at"`   // Unix seconds, 0/empty = never
 }
 
 type UpdateAnnouncementRequest struct {
@@ -244,4 +244,3 @@ func (h *AnnouncementHandler) ListReadStatus(c *gin.Context) {
 
 	response.Paginated(c, items, paginationResult.Total, page, pageSize)
 }
-
diff --git a/backend/internal/handler/announcement_handler.go b/backend/internal/handler/announcement_handler.go
index 1e1424eb..72823eaf 100644
--- a/backend/internal/handler/announcement_handler.go
+++ b/backend/internal/handler/announcement_handler.go
@@ -79,4 +79,3 @@ func parseBoolQuery(v string) bool {
 		return false
 	}
 }
-
diff --git a/backend/internal/handler/dto/announcement.go b/backend/internal/handler/dto/announcement.go
index ec2a8ca7..bc0db1b2 100644
--- a/backend/internal/handler/dto/announcement.go
+++ b/backend/internal/handler/dto/announcement.go
@@ -72,4 +72,3 @@ func UserAnnouncementFromService(a *service.UserAnnouncement) *UserAnnouncement
 		UpdatedAt: a.Announcement.UpdatedAt,
 	}
 }
-
diff --git a/backend/internal/repository/announcement_read_repo.go b/backend/internal/repository/announcement_read_repo.go
index 1c6b480a..2dc346b1 100644
--- a/backend/internal/repository/announcement_read_repo.go
+++ b/backend/internal/repository/announcement_read_repo.go
@@ -81,4 +81,3 @@ func (r *announcementReadRepository) CountByAnnouncementID(ctx context.Context,
 	}
 	return int64(count), nil
 }
-
diff --git a/backend/internal/repository/announcement_repo.go b/backend/internal/repository/announcement_repo.go
index edeb82e6..52029e4e 100644
--- a/backend/internal/repository/announcement_repo.go
+++ b/backend/internal/repository/announcement_repo.go
@@ -192,4 +192,3 @@ func announcementEntitiesToService(models []*dbent.Announcement) []service.Annou
 	}
 	return out
 }
-
diff --git a/backend/internal/service/announcement_targeting_test.go b/backend/internal/service/announcement_targeting_test.go
index fffea26b..4d904c7d 100644
--- a/backend/internal/service/announcement_targeting_test.go
+++ b/backend/internal/service/announcement_targeting_test.go
@@ -64,4 +64,3 @@ func TestAnnouncementTargeting_Matches_AndOrSemantics(t *testing.T) {
 	require.False(t, targeting.Matches(99.9, map[int64]struct{}{10: {}}))
 	require.True(t, targeting.Matches(100, map[int64]struct{}{10: {}}))
 }
-