WIP Prepare postgres for migration by replication

site-cookbooks/kosmos_postgresql/files/drop_subscriptions.sh

@@ -0,0 +1,28 @@
+set -e
+
+echo "== Dropping subscriptions on PG14 =="
+
+for db in $(psql -Atqc "SELECT datname FROM pg_database WHERE datallowconn AND datname NOT IN ('template0,'template1'')"); do
+  echo "Processing DB: $db"
+
+  SUB="migrate_sub_${db}"
+
+  # Disable first (important)
+  psql -d "$db" -c "ALTER SUBSCRIPTION $SUB DISABLE;" 2>/dev/null || true
+
+  # Drop subscription if exists
+  psql -d "$db" -v ON_ERROR_STOP=1 <<SQL
+DO \$\$
+BEGIN
+  IF EXISTS (
+    SELECT 1 FROM pg_subscription WHERE subname = '$SUB'
+  ) THEN
+    DROP SUBSCRIPTION $SUB;
+  END IF;
+END
+\$\$;
+SQL
+
+done
+
+echo "== Done =="