diff --git a/README.md b/README.md
index b411b6d..e309062 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ For other matters, use a `chores` branch (i.e. `chores/add-dbt-package`).
 
 ## Project organization
 
-We organize models in four folders:
+We organize models in three folders:
 
 - `staging`
   - Pretty much this: <https://docs.getdbt.com/best-practices/how-we-structure/2-staging>
@@ -89,6 +89,8 @@ We organize models in four folders:
   - Split schema and domain with double underscode (ie `stg_core__booking`).
   - Always use sources to read into staging models.
 - SQL formatting should be done with `sqlfmt`.
+- Other conventions
+  - In staging, enforce a `lower()` to user UUID fields to avoid nasty propagations in the DWH.
 
 When in doubt, do what dbt guys would do: <https://docs.getdbt.com/best-practices>
 Or Gitlab: <https://handbook.gitlab.com/handbook/business-technology/data-team/platform/dbt-guide/>
diff --git a/models/intermediate/core/int_core__host_booking_fees.sql b/models/intermediate/core/int_core__host_booking_fees.sql
index 246c904..5844528 100644
--- a/models/intermediate/core/int_core__host_booking_fees.sql
+++ b/models/intermediate/core/int_core__host_booking_fees.sql
@@ -25,9 +25,7 @@ from stg_core__booking b
 left join int_core__booking_charge_events bce on b.id_booking = bce.id_booking
 left join stg_core__booking_state bs on b.id_booking_state = bs.id_booking_state
 left join int_core__duplicate_bookings db on b.id_booking = db.id_booking
-left join int_core__unified_user uu on lower(b.id_user_host) = lower(uu.id_user)
--- We user 'lower' because the id_user_host can be found in capital letters or not
--- depending on the table and Postgres is case sensitive
+left join int_core__unified_user uu on b.id_user_host = uu.id_user
 left join
     int_simple_exchange_rates ser
     on (
diff --git a/models/staging/core/stg_core__accommodation.sql b/models/staging/core/stg_core__accommodation.sql
index b28eedb..fa35a9a 100644
--- a/models/staging/core/stg_core__accommodation.sql
+++ b/models/staging/core/stg_core__accommodation.sql
@@ -3,7 +3,7 @@ with
     stg_core__accommodation as (
         select
             {{ adapter.quote("AccommodationId") }} as id_accommodation,
-            {{ adapter.quote("CreatedByUserId") }} as id_creating_user,
+            lower({{ adapter.quote("CreatedByUserId") }}) as id_creating_user,
             {{ adapter.quote("PaymentValidationSetId") }} as id_payment_validation_set,
             {{ adapter.quote("FriendlyName") }} as friendly_name,
             {{ adapter.quote("CountryId") }} as id_country,
diff --git a/models/staging/core/stg_core__accommodation_to_user.sql b/models/staging/core/stg_core__accommodation_to_user.sql
index 7841d02..37ddf28 100644
--- a/models/staging/core/stg_core__accommodation_to_user.sql
+++ b/models/staging/core/stg_core__accommodation_to_user.sql
@@ -4,7 +4,7 @@ with
     ),
     stg_core__accommodation_to_user as (
         select
-            {{ adapter.quote("SuperhogUserId") }} as id_user_owner,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user_owner,
             {{ adapter.quote("AccommodationId") }} as id_accommodation,
             {{ adapter.quote("AccommodationToUserId") }} as id_accommodation_to_user,
             {{ adapter.quote("AccommodationUserType") }} as accommodation_user_type,
diff --git a/models/staging/core/stg_core__booking.sql b/models/staging/core/stg_core__booking.sql
index 604038b..cd3cd71 100644
--- a/models/staging/core/stg_core__booking.sql
+++ b/models/staging/core/stg_core__booking.sql
@@ -16,8 +16,8 @@ with
     stg_core__booking as (
         select
             {{ adapter.quote("BookingId") }} as id_booking,
-            {{ adapter.quote("GuestUserId") }} as id_user_guest,
-            {{ adapter.quote("CreatedByUserId") }} as id_user_host,
+            lower({{ adapter.quote("GuestUserId") }}) as id_user_guest,
+            lower({{ adapter.quote("CreatedByUserId") }}) as id_user_host,
             {{ adapter.quote("IntegrationId") }} as id_integration,
             {{ adapter.quote("AccommodationId") }} as id_accommodation,
             {{ adapter.quote("BookingSourceId") }} as id_booking_source,
diff --git a/models/staging/core/stg_core__claim.sql b/models/staging/core/stg_core__claim.sql
index f76665f..a9c6de3 100644
--- a/models/staging/core/stg_core__claim.sql
+++ b/models/staging/core/stg_core__claim.sql
@@ -3,7 +3,7 @@ with
     stg_core__claim as (
         select
             {{ adapter.quote("Id") }} as id_claim,
-            {{ adapter.quote("UserId") }} as id_user,
+            lower({{ adapter.quote("UserId") }}) as id_user,
             {{ adapter.quote("ClaimType") }} as claim_type,
             {{ adapter.quote("ClaimValue") }} as claim_value,
             {{ adapter.quote("_airbyte_extracted_at") }} as dwh_extracted_at_utc
diff --git a/models/staging/core/stg_core__edeposit_user.sql b/models/staging/core/stg_core__edeposit_user.sql
index 9962477..d0514fa 100644
--- a/models/staging/core/stg_core__edeposit_user.sql
+++ b/models/staging/core/stg_core__edeposit_user.sql
@@ -21,7 +21,7 @@ with
     stg_core__edeposit_user as (
         select
             {{ adapter.quote("Id") }} as id,
-            {{ adapter.quote("UserId") }} as id_user_partner,
+            lower({{ adapter.quote("UserId") }}) as id_user_partner,
             upper(substring({{ adapter.quote("Currency") }} from 1 for 3)) as currency,
             -- this shitty thing right here is all because the currency is currently
             -- set up as a free text.
diff --git a/models/staging/core/stg_core__integration.sql b/models/staging/core/stg_core__integration.sql
index 17d5f3e..7097489 100644
--- a/models/staging/core/stg_core__integration.sql
+++ b/models/staging/core/stg_core__integration.sql
@@ -4,7 +4,7 @@ with
         select
             {{ adapter.quote("Id") }} as id_integration,
             {{ adapter.quote("Identifier") }} as uuid_integration,
-            {{ adapter.quote("SuperhogUserId") }} as id_superhog_user,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_superhog_user,
             {{ adapter.quote("IntegrationTypeId") }} id_integration_type,
             {{ adapter.quote("IsActive") }} as is_active,
             {{ adapter.quote("LoggingIsActive") }} as is_logging_active,
diff --git a/models/staging/core/stg_core__payment_validation_set.sql b/models/staging/core/stg_core__payment_validation_set.sql
index ec0befc..1ee3cac 100644
--- a/models/staging/core/stg_core__payment_validation_set.sql
+++ b/models/staging/core/stg_core__payment_validation_set.sql
@@ -8,7 +8,7 @@ with
     stg_core__payment_validation_set as (
         select
             {{ adapter.quote("Id") }} as id_payment_validation_set,
-            {{ adapter.quote("SuperhogUserId") }} as id_guest_host,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_guest_host,
             {{ adapter.quote("Name") }} as payment_validation_set_name,
             {{ adapter.quote("Version") }} as payment_validation_set_version,
             {{ adapter.quote("IsActive") }} as is_active,
diff --git a/models/staging/core/stg_core__price_plan_to_user.sql b/models/staging/core/stg_core__price_plan_to_user.sql
index f7cfa29..b488f93 100644
--- a/models/staging/core/stg_core__price_plan_to_user.sql
+++ b/models/staging/core/stg_core__price_plan_to_user.sql
@@ -11,7 +11,7 @@ with
     stg_core__price_plan_to_user as (
         select
             {{ adapter.quote("Id") }} as id_price_plan,
-            {{ adapter.quote("SuperhogUserId") }} as id_user_host,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user_host,
             {{ adapter.quote("PricePlanChargedByTypeId") }}
             as id_price_plan_charged_by_type,
             {{ adapter.quote("StartDate") }} as start_at_utc,
diff --git a/models/staging/core/stg_core__superhog_user.sql b/models/staging/core/stg_core__superhog_user.sql
index 5f3468b..4a1d8c3 100644
--- a/models/staging/core/stg_core__superhog_user.sql
+++ b/models/staging/core/stg_core__superhog_user.sql
@@ -18,7 +18,7 @@ with
             {{ adapter.quote("VerifiedDate") }} as verified_at_utc,
             cast({{ adapter.quote("VerifiedDate") }} as date) as verified_date_utc,
             {{ adapter.quote("FlagAsProblem") }} as flag_as_problem,
-            {{ adapter.quote("SuperhogUserId") }} as id_superhoguser,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_superhoguser,
             {{ adapter.quote("NumberOfProperties") }} as number_of_properties,
             {{ adapter.quote("SuperhogVerifiedSetId") }} id_superhog_verified_set,
             {{ adapter.quote("PlatformCommsRecipient") }} as platform_comms_recipient,
diff --git a/models/staging/core/stg_core__user.sql b/models/staging/core/stg_core__user.sql
index 9e72d2d..56a06cf 100644
--- a/models/staging/core/stg_core__user.sql
+++ b/models/staging/core/stg_core__user.sql
@@ -6,7 +6,7 @@ with
         select
             {{ adapter.quote("Id") }} as id_user,
             {{ adapter.quote("AccountTypeId") }} as id_account_type,
-            {{ adapter.quote("CreatedUserId") }} as id_created_user,
+            lower({{ adapter.quote("CreatedUserId") }}) as id_created_user,
             {{ adapter.quote("BillingCountryId") }} as id_billing_country,
             {{ adapter.quote("AccountCurrencyId") }} as id_account_currency,
             {{ adapter.quote("Code") }} as user_code,
diff --git a/models/staging/core/stg_core__user_product_bundle.sql b/models/staging/core/stg_core__user_product_bundle.sql
index 42fed1e..4c949f7 100644
--- a/models/staging/core/stg_core__user_product_bundle.sql
+++ b/models/staging/core/stg_core__user_product_bundle.sql
@@ -5,7 +5,7 @@ with
     stg_core__user_product_bundle as (
         select
             {{ adapter.quote("Id") }} as id_user_product_bundle,
-            {{ adapter.quote("SuperhogUserId") }} as id_user,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user,
             {{ adapter.quote("ProductBundleId") }} as id_product_bundle,
             {{ adapter.quote("ProtectionPlanId") }} as id_protection_plan,
 
diff --git a/models/staging/core/stg_core__user_role.sql b/models/staging/core/stg_core__user_role.sql
index 97d9aec..0f8fbfd 100644
--- a/models/staging/core/stg_core__user_role.sql
+++ b/models/staging/core/stg_core__user_role.sql
@@ -3,7 +3,7 @@ with source as (
 ),
 stg_core__user_role as (
     select
-        {{ adapter.quote("UserId") }} as id_user,
+        lower({{ adapter.quote("UserId") }}) as id_user,
         {{ adapter.quote("RoleId") }} as id_role,
         {{ adapter.quote("_airbyte_extracted_at") }} as dwh_extracted_at_utc
     from source
diff --git a/models/staging/core/stg_core__verification.sql b/models/staging/core/stg_core__verification.sql
index 5fd8b9c..a8ffbca 100644
--- a/models/staging/core/stg_core__verification.sql
+++ b/models/staging/core/stg_core__verification.sql
@@ -5,7 +5,7 @@ with
     stg_core__verification as (
         select
             {{ adapter.quote("Id") }} as id_verification,
-            {{ adapter.quote("SuperhogUserId") }} as id_user_guest,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user_guest,
             {{ adapter.quote("VerificationStatusId") }} as id_verification_status,
             {{ adapter.quote("VerificationRequestId") }} as id_verification_request,
             {{ adapter.quote("Name") }} as verification,
diff --git a/models/staging/core/stg_core__verification_request.sql b/models/staging/core/stg_core__verification_request.sql
index d0101a8..f354cf8 100644
--- a/models/staging/core/stg_core__verification_request.sql
+++ b/models/staging/core/stg_core__verification_request.sql
@@ -22,8 +22,8 @@ with
             {{ adapter.quote("VerificationSetId") }} as id_verification_set,
             {{ adapter.quote("SuperhogVerifiedSetId") }} as id_superhog_verified_set,
             {{ adapter.quote("PaymentValidationSetId") }} as id_payment_validation_set,
-            {{ adapter.quote("SuperhogUserId") }} as id_user_guest,
-            {{ adapter.quote("CreatedByUserId") }} as id_user_host,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user_guest,
+            lower({{ adapter.quote("CreatedByUserId") }}) as id_user_host,
             {{ adapter.quote("Url") }} as verification_url,
             {{ adapter.quote("CallbackUrl") }} as callback_url,
             {{ adapter.quote("RedirectUrl") }} as redirect_url,
diff --git a/models/staging/core/stg_core__verification_set.sql b/models/staging/core/stg_core__verification_set.sql
index 1f792d9..4e9159f 100644
--- a/models/staging/core/stg_core__verification_set.sql
+++ b/models/staging/core/stg_core__verification_set.sql
@@ -3,7 +3,7 @@ with
     stg_core__verification_set as (
         select
             {{ adapter.quote("Id") }} as id_verification_set,
-            {{ adapter.quote("SuperhogUserId") }} as id_user_host,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_user_host,
             {{ adapter.quote("Version") }} as verification_set_version,
             {{ adapter.quote("AutoFill") }} as autofill,
             {{ adapter.quote("IsActive") }} as is_active,
diff --git a/models/staging/core/stg_core__verification_to_payment.sql b/models/staging/core/stg_core__verification_to_payment.sql
index fe16b30..be69c92 100644
--- a/models/staging/core/stg_core__verification_to_payment.sql
+++ b/models/staging/core/stg_core__verification_to_payment.sql
@@ -17,7 +17,7 @@ with
             cast({{ adapter.quote("RefundDueDate") }} as date) as refund_due_date_utc,
             {{ adapter.quote("PaymentDueDate") }} as payment_due_at_utc,
             cast({{ adapter.quote("PaymentDueDate") }} as date) as payment_due_date_utc,
-            {{ adapter.quote("SuperhogUserId") }} as id_guest_user,
+            lower({{ adapter.quote("SuperhogUserId") }}) as id_guest_user,
             {{ adapter.quote("VerificationId") }} as id_verification,
             {{ adapter.quote("VerificationPaymentTypeId") }}
             as id_verification_payment_type,