Load staging baseline even if db in use

script/ci/restore-staging-baseline.sh

@@ -5,6 +5,7 @@
 
 set -e
 
+# Load default values if not already set.
 : ${DB_USER='ofn_user'}
 : ${DB_DATABASE='openfoodnetwork'}
 
@@ -18,8 +19,28 @@ else
 	exit 1
 fi
 
-dropdb -h localhost -U "$DB_USER" "$DB_DATABASE" --if-exists
-createdb -h localhost -U "$DB_USER" "$DB_DATABASE"
+# We want to re-create the database but it's still in use.
+# The SQL query below is a workaround suppoting old postgresql versions.
+#
+# Once we have at least Postgresql 13, we can replace these SQL commands with:
+#
+#   DROP DATABASE IF EXISTS $DB_DATABASE WITH FORCE
+#   CREATE DATABASE $DB_DATABASE
+#
+# Versions:
+# - Ubuntu 16: psql 9.5
+# - Ubuntu 18: psql 10
+# - Ubuntu 20: psql 15 <-- switch here
+psql -h localhost -U "$DB_USER" postgres <<EOF
+REVOKE CONNECT ON DATABASE $DB_DATABASE FROM public;
+ALTER DATABASE $DB_DATABASE CONNECTION LIMIT 0;
+SELECT pg_terminate_backend(pid)
+FROM pg_stat_activity
+WHERE pid <> pg_backend_pid()
+AND datname='$DB_DATABASE';
+DROP DATABASE $DB_DATABASE;
+CREATE DATABASE $DB_DATABASE;
+EOF
 
 gunzip -c "$srcfile" | psql -h localhost -U "$DB_USER" "$DB_DATABASE"
 echo "Staging baseline data restored."

script/ci/save-staging-baseline.sh

@@ -5,6 +5,7 @@
 
 set -e
 
+# Load default values if not already set.
 : ${DB_USER='ofn_user'}
 : ${DB_DATABASE='openfoodnetwork'}