diff --git a/src/main/java/org/miracum/etl/fhirgateway/stores/PostgresFhirResourceRepository.java b/src/main/java/org/miracum/etl/fhirgateway/stores/PostgresFhirResourceRepository.java
index 15d9320c..1a8bae94 100644
--- a/src/main/java/org/miracum/etl/fhirgateway/stores/PostgresFhirResourceRepository.java
+++ b/src/main/java/org/miracum/etl/fhirgateway/stores/PostgresFhirResourceRepository.java
@@ -83,6 +83,13 @@ private int insertResources(Bundle bundle) {
             .map(
                 resource ->
                     new Object[] {
+                    // TODO add encounter id / patient id / encounter_start date here
+                    // this would depend also on the resources, e.g.
+                    // type = "Patient": Encounter-ID: NULL, Patient-ID: Patient.id
+                    // type = "Encounter": Encounter-ID: Encounter.id, Patient.id: REPLACE(jsonb_path_query(Encounter.DATA, '$.subject') ->> 'reference', 'Patient/', '')
+                    // type = "Condition": Encounter-ID: REPLACE(Condition.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')
+                    // type = "Procedure": Encounter-ID: REPLACE(Procedure.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')
+                    // type = "Observation": Encounter-ID: REPLACE(Observation.DATA -> 'encounter' ->> 'reference', 'Encounter/', '')
                       resource.getIdElement().getIdPart(),
                       resource.fhirType(),
                       fhirParser.encodeResourceToString(resource)