Metabase: add db cleanup script

To be executed when removing metabase from deployment. This script will
remove all metabase-related records from DB

* ITISFoundation#1093

Author: YuryHrytsuk

services/metabase/.gitignore

@@ -1,2 +1,3 @@
 configure_metabase.sql
+remove_metabase.sql
 docker-compose.yml

services/metabase/Makefile

@@ -28,3 +28,7 @@ docker-compose.yml: docker-compose.yml.j2 .env venv
 configure_metabase.sql: .env
 	@set -o allexport; source $<; set +o allexport; \
 	envsubst < $@.template > $@
+
+remove_metabase.sql: .env
+	@set -o allexport; source $<; set +o allexport; \
+	envsubst < $@.template > $@

services/metabase/remove_metabase.sql.template

@@ -0,0 +1,15 @@
+-- need to be executed while connected as ${METABASE_POSTGRES_USER} user
+DROP DATABASE ${METABASE_POSTGRES_DB};
+
+/*
+need to be executed while connected to ${POSTGRES_DB} database
+as ${POSTGRES_USER} user
+*/
+
+REVOKE SELECT ON TABLE ${METABASE_POSTGRES_ALLOWED_SIMCORE_TABLES} FROM ${METABASE_POSTGRES_USER};
+
+REVOKE USAGE ON SCHEMA public FROM ${METABASE_POSTGRES_USER};
+
+REVOKE CONNECT ON DATABASE ${POSTGRES_DB} FROM ${METABASE_POSTGRES_USER};
+
+DROP USER ${METABASE_POSTGRES_USER};