Rewrite identity and access management

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/task.go

@@ -46,24 +46,8 @@ type (
 	}
 
 	Tasks []*Task
-
-	ErrTaskNotFound struct {
-		Identifier string
-	}
-
-	ErrTaskAlreadyExists struct {
-		message string
-	}
 )
 
-func (e ErrTaskNotFound) Error() string {
-	return fmt.Sprintf("task not found: %q", e.Identifier)
-}
-
-func (e ErrTaskAlreadyExists) Error() string {
-	return e.message
-}
-
 func (c Task) CursorKey(orderBy TaskOrderField) page.CursorKey {
 	switch orderBy {
 	case TaskOrderFieldCreatedAt:
@@ -114,7 +98,7 @@ LIMIT 1;
 	task, err := pgx.CollectExactlyOneRow(rows, pgx.RowToStructByName[Task])
 	if err != nil {
 		if errors.Is(err, pgx.ErrNoRows) {
-			return &ErrTaskNotFound{Identifier: taskID.String()}
+			return ErrResourceNotFound
 		}
 
 		return fmt.Errorf("cannot collect tasks: %w", err)
@@ -185,9 +169,7 @@ VALUES (
 		var pgErr *pgconn.PgError
 		if errors.As(err, &pgErr) {
 			if pgErr.Code == "23505" && pgErr.ConstraintName == "tasks_reference_id_unique" {
-				return &ErrTaskAlreadyExists{
-					message: fmt.Sprintf("task with measure_id %s and reference_id %q already exists", c.MeasureID, c.ReferenceID),
-				}
+				return ErrResourceAlreadyExists
 			}
 		}
 		return fmt.Errorf("cannot insert task: %w", err)