diff --git a/frontend/src/client/builder.ts b/frontend/src/client/builder.ts
index c92f49a..ffb56df 100644
--- a/frontend/src/client/builder.ts
+++ b/frontend/src/client/builder.ts
@@ -815,6 +815,13 @@ async function loadScenario(id: string): Promise<void> {
     setSaveState("error");
     return;
   }
+  // Defensive: Go's encoding/json serialises a nil slice as `null`, not
+  // `[]`. The server initialises these arrays today, but normalising on
+  // the client too means a future regression (or an older deployed
+  // build) can't crash renderCanvas with `null.filter(...)`.
+  if (!Array.isArray(deep.proceedings)) deep.proceedings = [];
+  if (!Array.isArray(deep.events)) deep.events = [];
+  if (!Array.isArray(deep.shares)) deep.shares = [];
   state.active = deep;
   state.pending = {};
   writeScenarioToUrl(id);
diff --git a/internal/services/deadline_service.go b/internal/services/deadline_service.go
index 70327e1..8d6319c 100644
--- a/internal/services/deadline_service.go
+++ b/internal/services/deadline_service.go
@@ -265,7 +265,7 @@ func (s *DeadlineService) ListVisibleForUser(ctx context.Context, userID uuid.UU
 
 	query := `
 		SELECT f.id, f.project_id, f.title, f.description, f.due_date, f.original_due_date,
-		       f.warning_date, f.source, f.rule_id, f.rule_code, f.custom_rule_text, f.status, f.completed_at,
+		       f.warning_date, f.source, f.sequencing_rule_id, f.rule_code, f.custom_rule_text, f.status, f.completed_at,
 		       f.caldav_uid, f.caldav_etag, f.notes, f.created_by,
 		       f.created_at, f.updated_at,
 		       f.approval_status, f.pending_request_id, f.approved_by, f.approved_at,
diff --git a/internal/services/projection_service.go b/internal/services/projection_service.go
index a51f383..fe0150e 100644
--- a/internal/services/projection_service.go
+++ b/internal/services/projection_service.go
@@ -1247,7 +1247,7 @@ func (s *ProjectionService) collectActualsForOverrides(
 	}
 	var dRows []drow
 	scopeFilter := scopeProjectIDFilter("d", "project_id", projectID, directOnly)
-	q := `SELECT d.rule_id, d.rule_code, d.due_date, d.completed_at, d.status
+	q := `SELECT d.sequencing_rule_id AS rule_id, d.rule_code, d.due_date, d.completed_at, d.status
 	        FROM paliad.deadlines d
 	       WHERE ` + scopeFilter
 	if err := s.db.SelectContext(ctx, &dRows, q, projectID); err != nil {
diff --git a/internal/services/scenario_builder_service.go b/internal/services/scenario_builder_service.go
index df3c6da..86986a2 100644
--- a/internal/services/scenario_builder_service.go
+++ b/internal/services/scenario_builder_service.go
@@ -204,7 +204,15 @@ func (s *ScenarioBuilderService) GetScenarioDeep(ctx context.Context, userID, sc
 		return nil, ErrScenarioBuilderNotVisible
 	}
 
-	deep := &BuilderScenarioDeep{BuilderScenario: *sc}
+	deep := &BuilderScenarioDeep{
+		BuilderScenario: *sc,
+		// Initialise to empty so the JSON response always carries arrays,
+		// not null — the builder frontend's renderCanvas calls .filter on
+		// proceedings/events unconditionally once state.active is set.
+		Proceedings: []BuilderProceeding{},
+		Events:      []BuilderEvent{},
+		Shares:      []BuilderShare{},
+	}
 
 	if err := s.db.SelectContext(ctx, &deep.Proceedings, `
 		SELECT id, scenario_id, proceeding_type_id, primary_party, scenario_flags,