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backend/app/wait_for_db.py

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+import asyncio
+import sys
+from sqlalchemy import text
+from app.core.db import SessionLocal
+
+
+async def main() -> int:
+    retries = 30
+    for _ in range(retries):
+        try:
+            async with SessionLocal() as session:
+                await session.execute(text("SELECT 1"))
+            return 0
+        except Exception:
+            await asyncio.sleep(2)
+    return 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(asyncio.run(main()))