feat: harden campaign delivery and editing

tests/test_campaign_audit_atomicity.py

@@ -10,6 +10,7 @@ from govoplan_campaign.backend import route_support
 from govoplan_campaign.backend.routes import campaigns as campaign_routes
 from govoplan_campaign.backend.routes import versions as version_routes
 from govoplan_campaign.backend.schemas import CampaignUpdateRequest, CampaignVersionUpdateRequest
+from govoplan_core.core.concurrency import strong_resource_etag
 
 
 def _principal() -> SimpleNamespace:
@@ -28,6 +29,7 @@ def test_version_update_rolls_back_when_its_audit_record_cannot_be_written() ->
         raw_json={},
         current_flow="manual",
         current_step="recipients",
+        edit_revision=1,
     )
 
     def mutate(*_args, **kwargs):
@@ -47,7 +49,15 @@ def test_version_update_rolls_back_when_its_audit_record_cannot_be_written() ->
                 principal,  # type: ignore[arg-type]
                 "campaign-1",
                 "version-1",
-                CampaignVersionUpdateRequest(current_step="recipients"),
+                CampaignVersionUpdateRequest(
+                    current_step="recipients",
+                    base_revision=1,
+                ),
+                if_match=strong_resource_etag(
+                    "campaign_version",
+                    "version-1",
+                    1,
+                ),
                 autosave=True,
                 audit_action="campaign.version_autosaved",
             )