feat: remove groups selectin on blocks model (#3423)

letta/orm/block.py

@@ -74,7 +74,7 @@ class Block(OrganizationMixin, SqlalchemyBase):
     groups: Mapped[List["Group"]] = relationship(
         "Group",
         secondary="groups_blocks",
-        lazy="selectin",
+        lazy="raise",
         back_populates="shared_blocks",
         passive_deletes=True,
     )

letta/serialize_schemas/marshmallow_block.py

@@ -12,4 +12,4 @@ class SerializedBlockSchema(BaseSchema):
 
     class Meta(BaseSchema.Meta):
         model = Block
-        exclude = BaseSchema.Meta.exclude + ("agents", "identities", "is_deleted")
+        exclude = BaseSchema.Meta.exclude + ("agents", "identities", "is_deleted", "groups")