chore(release): script database backup runbook

tests/unit/test_release_scripts.py

@@ -0,0 +1,20 @@
+from pathlib import Path
+
+
+def test_restore_postgres_plan_is_non_destructive():
+    script = Path("scripts/restore_postgres_plan.sh").read_text(encoding="utf-8")
+    executable_prefix = script.split("cat <<EOF", 1)[0]
+
+    assert "pg_restore" in script
+    assert "This script intentionally does not execute restore automatically." in script
+    assert "pg_restore" not in executable_prefix
+
+
+def test_backup_postgres_writes_manifest_and_version():
+    script = Path("scripts/backup_postgres.sh").read_text(encoding="utf-8")
+
+    assert "pg_dump" in script
+    assert "alembic_version.txt" in script
+    assert "manifest.txt" in script
+    assert "test -s" not in script
+    assert 'if [ ! -s "$DUMP_PATH" ]' in script