attachment backend use

server/app/mailer/persistence/campaigns.py

@@ -26,6 +26,10 @@ from app.mailer.campaign.validation import Severity, validate_campaign_config
 from app.mailer.messages.builder import build_campaign_messages
 from app.mailer.messages.models import MessageDraft
 from app.storage.services import record_campaign_attachment_uses_for_job
+from app.storage.campaign_attachments import (
+    annotate_built_messages_with_managed_files,
+    prepared_campaign_snapshot,
+)
 
 RUNTIME_DIR = Path(__file__).resolve().parents[3] / "runtime"
 CAMPAIGN_SNAPSHOT_DIR = RUNTIME_DIR / "campaign_snapshots"
@@ -195,7 +199,19 @@ def validate_campaign_version(
     }:
         raise CampaignPersistenceError("Audit-safe/final campaign versions cannot be validated. Create an editable copy instead.")
 
-    report = validate_campaign_config(config, campaign_file=snapshot_path, check_files=check_files)
+    if check_files:
+        with prepared_campaign_snapshot(
+            session,
+            tenant_id=tenant_id,
+            campaign_id=campaign.id,
+            raw_json=version.raw_json if isinstance(version.raw_json, dict) else {},
+            include_bytes=False,
+            prefix="multimailer-managed-validate-",
+        ) as prepared:
+            managed_config = load_campaign_config(prepared.path)
+            report = validate_campaign_config(managed_config, campaign_file=prepared.path, check_files=True)
+    else:
+        report = validate_campaign_config(config, campaign_file=snapshot_path, check_files=False)
     report_json = report.model_dump(mode="json")
     report_json.update({"ok": report.ok, "error_count": report.error_count, "warning_count": report.warning_count})
     version.validation_summary = report_json
@@ -298,7 +314,17 @@ def build_campaign_version(
     _ensure_version_validated_and_locked(version)
 
     output_dir = BUILD_OUTPUT_DIR / campaign.id / version.id
-    result = build_campaign_messages(config, campaign_file=snapshot_path, output_dir=output_dir, write_eml=write_eml)
+    with prepared_campaign_snapshot(
+        session,
+        tenant_id=tenant_id,
+        campaign_id=campaign.id,
+        raw_json=version.raw_json if isinstance(version.raw_json, dict) else {},
+        include_bytes=True,
+        prefix="multimailer-managed-build-",
+    ) as prepared:
+        managed_config = load_campaign_config(prepared.path)
+        result = build_campaign_messages(managed_config, campaign_file=prepared.path, output_dir=output_dir, write_eml=write_eml)
+        annotate_built_messages_with_managed_files(result.built_messages, prepared.managed_files_by_local_path)
     report_json = result.report.model_dump(mode="json", by_alias=True)
     report_json.update({
         "built_count": result.report.built_count,