[OWL-159] fix grafana-db-schema.sql
[OWL-159] fix grafana-db-schema.sql

minimum-hsu/scripts,Cepave/open-falcon-backend,Cepave/scripts,Cepave/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,Cepave/scripts,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,minimum-hsu/scripts