feat: Add buffered channel with worker thread for job start API

Fixes #293
Refactoring on the way

internal/repository/jobFind.go

@@ -99,6 +99,23 @@ func (r *JobRepository) FindById(ctx context.Context, jobId int64) (*schema.Job,
 	return scanJob(q.RunWith(r.stmtCache).QueryRow())
 }
 
+// FindByIdWithUser executes a SQL query to find a specific batch job.
+// The job is queried using the database id. The user is passed directly,
+// instead as part of the context.
+// It returns a pointer to a schema.Job data structure and an error variable.
+// To check if no job was found test err == sql.ErrNoRows
+func (r *JobRepository) FindByIdWithUser(user *schema.User, jobId int64) (*schema.Job, error) {
+	q := sq.Select(jobColumns...).
+		From("job").Where("job.id = ?", jobId)
+
+	q, qerr := SecurityCheckWithUser(user, q)
+	if qerr != nil {
+		return nil, qerr
+	}
+
+	return scanJob(q.RunWith(r.stmtCache).QueryRow())
+}
+
 // FindByIdDirect executes a SQL query to find a specific batch job.
 // The job is queried using the database id.
 // It returns a pointer to a schema.Job data structure and an error variable.