diff --git a/projects/marseille/models/marts/proposals_with_impersonation_info.sql b/projects/marseille/models/marts/proposals_with_impersonation_info.sql
index c6c9b6d..fb4a942 100644
--- a/projects/marseille/models/marts/proposals_with_impersonation_info.sql
+++ b/projects/marseille/models/marts/proposals_with_impersonation_info.sql
@@ -1,9 +1,14 @@
-SELECT 
-    proposals.*
-    --(CASE
-    --WHEN proposals.created_at BETWEEN impersonations.started_at AND impersonations.ended_at THEN true ELSE false END
-    --) AS authored_by_impersonation
-FROM {{ ref("proposals") }} AS proposals
-LEFT JOIN {{ ref("decidim_impersonation_logs") }} AS impersonations ON proposals.first_author_id = impersonations.user_id
+WITH proposals_under_impersonation AS (
+    SELECT 
+    proposals.id AS proposal_id
+    FROM {{ ref("proposals") }} AS proposals
+    LEFT JOIN {{ ref("decidim_impersonation_logs") }} AS impersonations ON proposals.first_author_id = impersonations.user_id
     WHERE proposals.created_at BETWEEN impersonations.started_at AND impersonations.ended_at
-    ORDER BY proposals.id
\ No newline at end of file
+    ORDER BY proposals.id
+)
+
+SELECT
+    *,
+    (CASE WHEN proposals_under_impersonation.proposal_id IS NOT NULL THEN true ELSE false END) AS authored_under_impersonation
+FROM {{ ref("proposals") }} AS proposals
+LEFT JOIN proposals_under_impersonation ON proposals.id = proposals_under_impersonation.proposal_id
\ No newline at end of file
diff --git a/projects/marseille/models/marts/schema.yml b/projects/marseille/models/marts/schema.yml
new file mode 100644
index 0000000..42fd1cf
--- /dev/null
+++ b/projects/marseille/models/marts/schema.yml
@@ -0,0 +1,13 @@
+unit_tests:
+  - name: 
+    description: ""
+    model: proposals_with_impersonation_info
+    given:
+      - input: ref('')
+        format: dict
+        rows:
+          - {}
+    expect:
+      format: dict
+      rows:
+        - {}
\ No newline at end of file