fix: skip comment-only migration SQL

packages/db/test/db.test.ts

@@ -9,6 +9,7 @@ import {
   createTableSql,
   parseMigration,
   applyMigrations,
+  appliedMigrations,
   migrate,
   status,
   rollback,
@@ -144,6 +145,22 @@ test("an empty migration set does not touch the database", async () => {
   expect(await applyMigrations(db, [])).toEqual([]);
 });
 
+test("comment-only migrations are recorded without executing empty SQL", async () => {
+  const db = createDb(sqlite());
+  const migrations = [
+    {
+      name: "0001_placeholder",
+      up: "-- Create application tables here.\n/* No schema yet. */\n;",
+      down: "-- Nothing to roll back.",
+    },
+  ];
+
+  expect(await applyMigrations(db, migrations)).toEqual(["0001_placeholder"]);
+  expect(await appliedMigrations(db)).toEqual(["0001_placeholder"]);
+  expect(await rollback(db, ".", { lock: false })).toBe("0001_placeholder");
+  await db.close();
+});
+
 test("migration dry-run plans changes without applying schema and honors cancellation", async () => {
   const db = createDb(sqlite());
   const migrations = [