docs: def get_entities_for_reindex(tags):
      """Collect entities for theses tags."""
      if isinstance(tags, Tag):
          tags = (tags,)
  
      session = db.session()
      indexing = get_service("indexing")
      tbl = Entity.__table__
      tag_ids = [t.id for t in tags]
      query = (
          sa.sql.select([tbl.c.entity_type, tbl.c.id])
          .select_from(tbl.join(entity_tag_tbl, entity_tag_tbl.c.entity_id == tbl.c.id))
          .where(entity_tag_tbl.c.tag_id.in_(tag_ids))
      )
  
      entities = set()
  
      with session.no_autoflush:
          for entity_type, entity_id in session.execute(query):
              if entity_type not in indexing.adapted:
                  logger.debug("%r is not indexed, skipping", entity_type)
  
              item = ("changed", entity_type, entity_id, ())
              entities.add(item)
  
      return entities