Add last_updated field to PhotoGallery and bump on mutations

Author: aapeliv

app/backend/src/couchers/models/uploads.py

@@ -80,6 +80,7 @@ class PhotoGallery(Base, kw_only=True):
     owner_user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), index=True)
 
     created: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), init=False)
+    last_updated: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), init=False)
 
     owner_user: Mapped[User] = relationship(init=False, foreign_keys=[owner_user_id], back_populates="galleries")
     photos: Mapped[list[PhotoGalleryItem]] = relationship(

app/backend/src/couchers/servicers/galleries.py

@@ -96,6 +96,7 @@ def AddPhotoToGallery(
             caption=request.caption or None,
         )
         session.add(item)
+        gallery.last_updated = func.now()
         session.flush()
         session.refresh(gallery)
 
@@ -124,6 +125,7 @@ def RemovePhotoFromGallery(
             context.abort_with_error_code(grpc.StatusCode.NOT_FOUND, "gallery_item_not_found")
 
         session.delete(item)
+        gallery.last_updated = func.now()
         session.flush()
         session.refresh(gallery)
 
@@ -184,6 +186,7 @@ def MovePhoto(
             session.execute(
                 update(PhotoGalleryItem).where(PhotoGalleryItem.id == request.item_id).values(position=new_position)
             )
+            gallery.last_updated = func.now()
 
         session.flush()
         session.refresh(gallery)
@@ -213,6 +216,7 @@ def UpdatePhotoCaption(
             context.abort_with_error_code(grpc.StatusCode.NOT_FOUND, "gallery_item_not_found")
 
         item.caption = request.caption or None
+        gallery.last_updated = func.now()
         session.flush()
         session.refresh(gallery)