feat: task system

backend/internal/domain/entities/task.go

@@ -0,0 +1,37 @@
+package entities
+
+import (
+	"time"
+
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+const MaxTaskDepth = 2
+
+// Task represents a task and supports up to 3 nesting levels (0,1,2).
+type Task struct {
+	ID           bson.ObjectID   `bson:"_id,omitempty"`
+	SpaceID      bson.ObjectID   `bson:"space_id"`
+	Title        string          `bson:"title"`
+	Description  string          `bson:"description"`
+	CategoryID   *bson.ObjectID  `bson:"category_id,omitempty"`
+	StatusID     bson.ObjectID   `bson:"status_id"`
+	ParentTaskID *bson.ObjectID  `bson:"parent_task_id,omitempty"`
+	Depth        int             `bson:"depth"`
+	NoteLinks    []bson.ObjectID `bson:"note_links"`
+	CreatedBy    bson.ObjectID   `bson:"created_by"`
+	UpdatedBy    bson.ObjectID   `bson:"updated_by"`
+	CreatedAt    time.Time       `bson:"created_at"`
+	UpdatedAt    time.Time       `bson:"updated_at"`
+}
+
+// TaskStatus defines the ordered linear status progression for a space.
+type TaskStatus struct {
+	ID        bson.ObjectID `bson:"_id,omitempty"`
+	SpaceID   bson.ObjectID `bson:"space_id"`
+	Name      string        `bson:"name"`
+	Color     string        `bson:"color,omitempty"`
+	Order     int           `bson:"order"`
+	CreatedAt time.Time     `bson:"created_at"`
+	UpdatedAt time.Time     `bson:"updated_at"`
+}

backend/internal/domain/repositories/interfaces.go

@@ -216,3 +216,24 @@ type NoteRevisionRepository interface {
 	// GetRevisionByID retrieves a specific revision
 	GetRevisionByID(ctx context.Context, id bson.ObjectID) (*entities.NoteRevision, error)
 }
+
+// TaskRepository defines task operations
+type TaskRepository interface {
+	CreateTask(ctx context.Context, task *entities.Task) error
+	GetTaskByID(ctx context.Context, id bson.ObjectID) (*entities.Task, error)
+	ListTasks(ctx context.Context, spaceID bson.ObjectID, filters map[string]any) ([]*entities.Task, error)
+	SearchTasks(ctx context.Context, spaceID bson.ObjectID, query string) ([]*entities.Task, error)
+	UpdateTask(ctx context.Context, task *entities.Task) error
+	DeleteTask(ctx context.Context, id bson.ObjectID) error
+	DeleteTasksBySpaceID(ctx context.Context, spaceID bson.ObjectID) error
+	CountChildren(ctx context.Context, parentTaskID bson.ObjectID) (int64, error)
+}
+
+// TaskStatusRepository defines task status operations
+type TaskStatusRepository interface {
+	CreateStatus(ctx context.Context, status *entities.TaskStatus) error
+	GetStatusByID(ctx context.Context, id bson.ObjectID) (*entities.TaskStatus, error)
+	ListStatuses(ctx context.Context, spaceID bson.ObjectID) ([]*entities.TaskStatus, error)
+	UpdateStatus(ctx context.Context, status *entities.TaskStatus) error
+	DeleteStatus(ctx context.Context, id bson.ObjectID) error
+}