chore: import upstream snapshot with attribution

libs/checkpoint-postgres/Makefile

@@ -0,0 +1,66 @@
+.PHONY: test test_watch lint type format
+
+######################
+# TESTING AND COVERAGE
+######################
+
+start-postgres:
+	POSTGRES_VERSION=${POSTGRES_VERSION:-16} docker compose -f tests/compose-postgres.yml up -V --force-recreate --wait || ( \
+		echo "Failed to start PostgreSQL, printing logs..."; \
+		docker compose -f tests/compose-postgres.yml logs; \
+		exit 1 \
+	)
+
+stop-postgres:
+	docker compose -f tests/compose-postgres.yml down
+
+POSTGRES_VERSIONS ?= 15 16
+test_pg_version:
+	@echo "Testing PostgreSQL $(POSTGRES_VERSION)"
+	@POSTGRES_VERSION=$(POSTGRES_VERSION) make start-postgres
+	@uv run pytest $(TEST)
+	@EXIT_CODE=$$?; \
+	make stop-postgres; \
+	echo "Finished testing PostgreSQL $(POSTGRES_VERSION); Exit code: $$EXIT_CODE"; \
+	exit $$EXIT_CODE
+
+test:
+	@for version in $(POSTGRES_VERSIONS); do \
+		if ! make test_pg_version POSTGRES_VERSION=$$version; then \
+			echo "Test failed for PostgreSQL $$version"; \
+			exit 1; \
+		fi; \
+	done
+	@echo "All PostgreSQL versions tested successfully"
+
+TEST ?= .
+test_watch:
+	POSTGRES_VERSION=${POSTGRES_VERSION:-16} make start-postgres; \
+	uv run ptw $(TEST); \
+	EXIT_CODE=$$?; \
+	make stop-postgres; \
+	exit $$EXIT_CODE
+
+######################
+# LINTING AND FORMATTING
+######################
+
+# Define a variable for Python and notebook files.
+PYTHON_FILES=.
+lint format: PYTHON_FILES=.
+lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
+lint_package: PYTHON_FILES=langgraph
+lint_tests: PYTHON_FILES=tests
+
+lint lint_diff lint_package lint_tests:
+	uv run ruff check .
+	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
+	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || uv run ty check $(PYTHON_FILES)
+
+type:
+	uv run ty check $(PYTHON_FILES)
+
+format format_diff:
+	uv run ruff format $(PYTHON_FILES)
+	uv run ruff check --select I --fix $(PYTHON_FILES)