Persist processing-log retention settings and wire cleanup defaults

backend/app/api/routes_processing_logs.py

@@ -7,6 +7,7 @@ from sqlalchemy.orm import Session
 
 from app.db.base import get_session
 from app.schemas.processing_logs import ProcessingLogEntryResponse, ProcessingLogListResponse
+from app.services.app_settings import read_processing_log_retention_settings
 from app.services.processing_logs import (
     cleanup_processing_logs,
     clear_processing_logs,
@@ -42,16 +43,28 @@ def get_processing_logs(
 
 @router.post("/trim")
 def trim_processing_logs(
-    keep_document_sessions: int = Query(default=2, ge=0, le=20),
-    keep_unbound_entries: int = Query(default=80, ge=0, le=400),
+    keep_document_sessions: int | None = Query(default=None, ge=0, le=20),
+    keep_unbound_entries: int | None = Query(default=None, ge=0, le=400),
     session: Session = Depends(get_session),
 ) -> dict[str, int]:
-    """Deletes old processing logs while keeping recent document sessions and unbound events."""
+    """Deletes old processing logs using query values or persisted retention defaults."""
+
+    retention_defaults = read_processing_log_retention_settings()
+    resolved_keep_document_sessions = (
+        keep_document_sessions
+        if keep_document_sessions is not None
+        else int(retention_defaults.get("keep_document_sessions", 2))
+    )
+    resolved_keep_unbound_entries = (
+        keep_unbound_entries
+        if keep_unbound_entries is not None
+        else int(retention_defaults.get("keep_unbound_entries", 80))
+    )
 
     result = cleanup_processing_logs(
         session=session,
-        keep_document_sessions=keep_document_sessions,
-        keep_unbound_entries=keep_unbound_entries,
+        keep_document_sessions=resolved_keep_document_sessions,
+        keep_unbound_entries=resolved_keep_unbound_entries,
     )
     session.commit()
     return result