feat: add pre-commit hooks & refactor code to pass linting

internal/db/query/task_group.sql

@@ -19,4 +19,3 @@ DELETE FROM task_group WHERE task_group_id = $1;
 
 -- name: UpdateTaskGroupLocation :one
 UPDATE task_group SET position = $2 WHERE task_group_id = $1 RETURNING *;
-

internal/db/repository.go

@@ -4,6 +4,7 @@ import (
 	"github.com/jmoiron/sqlx"
 )
 
+// Repository contains methods for interacting with a database storage
 type Repository struct {
 	*Queries
 	db *sqlx.DB