diff --git a/backend/app/db/models/user_slash_command.py b/backend/app/db/models/user_slash_command.py
index 7844472..aa3bcff 100644
--- a/backend/app/db/models/user_slash_command.py
+++ b/backend/app/db/models/user_slash_command.py
@@ -10,15 +10,12 @@ The unique ``(user_id, name)`` constraint prevents a user from shadowing a
 built-in's name with a custom command of the same name.
 """
 
-from __future__ import annotations
-
 import uuid
 from typing import TYPE_CHECKING
 
 from sqlalchemy import Boolean, Column, ForeignKey, Text, UniqueConstraint
 from sqlalchemy.dialects.postgresql import UUID as PG_UUID
-from sqlalchemy.orm import relationship
-from sqlmodel import Field, SQLModel
+from sqlmodel import Field, Relationship, SQLModel
 
 from app.db.base import TimestampMixin
 
@@ -48,7 +45,7 @@ class UserSlashCommand(TimestampMixin, SQLModel, table=True):
     prompt: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
     is_enabled: bool = Field(default=True, sa_column=Column(Boolean, nullable=False, default=True))
 
-    user: User = relationship("User", lazy="joined")
+    user: "User" = Relationship(sa_relationship_kwargs={"lazy": "joined"})
 
     def __repr__(self) -> str:
         kind = "custom" if self.prompt is not None else "builtin-override"
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index c2fca2a..62df219 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -88,7 +88,7 @@ services:
     networks:
       - backend
     healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:6333/healthz"]
+      test: bash -c ':> /dev/tcp/127.0.0.1/6333' || exit 1
       interval: 10s
       timeout: 5s
       retries: 5