feat: govern shared campaign artifact storage

src/govoplan_campaign/backend/retention.py

@@ -9,7 +9,15 @@ from typing import Any, Callable
 
 from sqlalchemy.orm import Session
 
+from govoplan_core.core.object_storage import (
+    StorageBackend,
+    StorageBackendError,
+    StorageObjectMissing,
+    configured_storage_backend,
+)
+from govoplan_core.settings import settings as core_settings
 from govoplan_campaign.backend.db.models import CampaignJob, CampaignVersion, JobImapStatus, JobQueueStatus
+from govoplan_campaign.backend.runtime import get_settings
 
 FINAL_VERSION_STATES = {
     "completed",
@@ -111,8 +119,16 @@ def _apply_eml_retention(
     dry_run: bool,
     now: datetime,
     policy_for_campaign_id: Callable[[str | None], object],
+    storage: StorageBackend | None = None,
 ) -> dict[str, int]:
-    result = {"eligible": 0, "metadata_cleared": 0, "files_deleted": 0, "files_missing": 0, "skipped_not_final": 0}
+    result = {
+        "eligible": 0,
+        "metadata_cleared": 0,
+        "files_deleted": 0,
+        "files_missing": 0,
+        "delete_failed": 0,
+        "skipped_not_final": 0,
+    }
     jobs = (
         session.query(CampaignJob)
         .filter((CampaignJob.eml_local_path.is_not(None)) | (CampaignJob.eml_storage_key.is_not(None)))
@@ -137,6 +153,21 @@ def _apply_eml_retention(
         result["eligible"] += 1
         if dry_run:
             continue
+        if job.eml_storage_key:
+            active_storage = storage or configured_storage_backend(
+                get_settings() or core_settings
+            )
+            try:
+                if active_storage.exists(job.eml_storage_key):
+                    active_storage.delete(job.eml_storage_key)
+                    result["files_deleted"] += 1
+                else:
+                    result["files_missing"] += 1
+            except StorageObjectMissing:
+                result["files_missing"] += 1
+            except StorageBackendError:
+                result["delete_failed"] += 1
+                continue
         if job.eml_local_path:
             path = Path(job.eml_local_path)
             if path.exists():