The sibling apps wrap their dataset names in an overridable
`${MAIN_DATASET:-${DATASET_PREFIX:-…}-${SERVICE_NAME_BACKEND}}` because they keep
historical datasets. Coolify stores such a default, itself an expression, as the
created variable's value, so the new app showed MAIN_DATASET and
SETTINGS_DATASET holding what reads as unresolved text. It does resolve at
deploy time (docker compose interpolates `.env` values), so this was confusing
rather than broken — but Festipod has no historical datasets to keep, so the
names are now computed directly: festipod-backend / settings-festipod-backend,
`…-backend-pr-<n>` in a preview, the same names as before.
The comment and the deployment leaf say what was observed and what was traced,
and that a second stack on the same Fuseki needs its own DATASET_PREFIX in both
its normal and preview scopes.
Sylvain Duchesne
5b61ce9905