Fix Python 3.9 compatibility in CLI type annotations

Replace Python 3.10+ union syntax (str | None) with Optional[str]
to ensure compatibility with Python 3.9 used in CI

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: abrookins

aredis_om/model/cli/migrate.py

@@ -1,5 +1,6 @@
 import asyncio
 import os
+from typing import Optional
 
 import click
 
@@ -24,7 +25,7 @@ def migrate():
 
 @migrate.command()
 @click.option("--migrations-dir", help="Directory containing schema migration files")
-def status(migrations_dir: str | None):
+def status(migrations_dir: Optional[str]):
     """Show current schema migration status from files."""
 
     async def _status():
@@ -66,10 +67,10 @@ async def _status():
     help="Skip confirmation prompt to create directory or run",
 )
 def run(
-    migrations_dir: str | None,
+    migrations_dir: Optional[str],
     dry_run: bool,
     verbose: bool,
-    limit: int | None,
+    limit: Optional[int],
     yes: bool,
 ):
     """Run pending schema migrations from files."""
@@ -119,7 +120,7 @@ async def _run():
 @click.option(
     "--yes", "-y", is_flag=True, help="Skip confirmation prompt to create directory"
 )
-def create(name: str, migrations_dir: str | None, yes: bool):
+def create(name: str, migrations_dir: Optional[str], yes: bool):
     """Create a new schema migration snapshot file from current pending operations."""
 
     async def _create():
@@ -161,7 +162,7 @@ async def _create():
 )
 def rollback(
     migration_id: str,
-    migrations_dir: str | None,
+    migrations_dir: Optional[str],
     dry_run: bool,
     verbose: bool,
     yes: bool,

aredis_om/model/cli/migrate_data.py

@@ -6,6 +6,7 @@
 """
 
 import asyncio
+from typing import Optional
 
 import click
 
@@ -175,7 +176,7 @@ async def _run():
 @click.option(
     "--yes", "-y", is_flag=True, help="Skip confirmation prompt to create directory"
 )
-def create(name: str, migrations_dir: str | None, yes: bool):
+def create(name: str, migrations_dir: Optional[str], yes: bool):
     """Create a new migration file."""
 
     async def _create():