Fix empty migration (#2978)

libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py

@@ -58,8 +58,6 @@ MIGRATIONS = [
 );""",
     "ALTER TABLE checkpoint_blobs ALTER COLUMN blob DROP not null;",
     """
-    """,
-    """
     CREATE INDEX CONCURRENTLY IF NOT EXISTS checkpoints_thread_id_idx ON checkpoints(thread_id);
     """,
     """

libs/checkpoint-postgres/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph-checkpoint-postgres"
-version = "2.0.9"
+version = "2.0.10"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 license = "MIT"

libs/checkpoint-postgres/tests/test_store.py

@@ -1,5 +1,6 @@
 # type: ignore
 
+import re
 from contextlib import contextmanager
 from typing import Any, Optional
 from uuid import uuid4
@@ -782,3 +783,10 @@ def test_scores(
 
         assert len(results) == 1
         assert results[0].score == pytest.approx(similarities[0], abs=1e-3)
+
+
+def test_nonnull_migrations() -> None:
+    _leading_comment_remover = re.compile(r"^/\*.*?\*/")
+    for migration in PostgresStore.MIGRATIONS:
+        statement = _leading_comment_remover.sub("", migration).split()[0]
+        assert statement.strip()

libs/checkpoint-postgres/tests/test_sync.py

@@ -1,5 +1,6 @@
 # type: ignore
 
+import re
 from contextlib import contextmanager
 from typing import Any
 from uuid import uuid4
@@ -238,3 +239,10 @@ def test_null_chars(saver_name: str, test_data) -> None:
             list(saver.list(None, filter={"my_key": "abc"}))[0].metadata["my_key"]
             == "abc"
         )
+
+
+def test_nonnull_migrations() -> None:
+    _leading_comment_remover = re.compile(r"^/\*.*?\*/")
+    for migration in PostgresSaver.MIGRATIONS:
+        statement = _leading_comment_remover.sub("", migration).split()[0]
+        assert statement.strip()