Add scaffolding for cron trigger support

database/func.go

@@ -670,3 +670,55 @@ RETURNING id, name, token;`
 
 	return s, nil
 }
+
+func (db *Database) GetCronsForPipeline(pipelineId uuid.UUID) ([]Cron, error) {
+	query := `
+SELECT id, cron
+FROM crons
+WHERE pipeline_id=$1;`
+
+	var crons []Cron
+
+	cronEntrys, err := db.Conn.Query(context.Background(), query, pipelineId)
+	if err != nil {
+		return crons, fmt.Errorf("Could not get crons for pipeline with id \"%v\": %w", pipelineId, err)
+	}
+	defer cronEntrys.Close()
+
+	for cronEntrys.Next() {
+		var cron Cron
+		var idStr string
+		if err := cronEntrys.Scan(
+			&idStr, &cron.Cron,
+		); err != nil {
+			return crons, err
+		}
+
+		cron.Id, err = uuid.Parse(idStr)
+		if err != nil {
+			return crons, err
+		}
+
+		crons = append(crons, cron)
+	}
+
+	return crons, nil
+}
+
+func (db *Database) AddCronForPipeline(pipelineId uuid.UUID, cron string) error {
+	query := `
+INSERT INTO crons (id, pipeline_id, cron)
+VALUES (uuid_generate_v4(), $1, $2);`
+
+	_, err := db.Conn.Exec(context.Background(), query, pipelineId, cron)
+	return err
+}
+
+func (db *Database) RemoveCronForPipeline(cronId uuid.UUID) error {
+	query := `
+DELETE FROM crons
+WHERE id=$1;`
+
+	_, err := db.Conn.Exec(context.Background(), query, cronId)
+	return err
+}