feat: migrations should noop faster

src/sentry/runner/commands/upgrade.py

@@ -3,6 +3,7 @@
 from django.db import connections
 from django.db.utils import ProgrammingError
 
+from sentry.new_migrations.monkey.executor import SentryMigrationExecutor
 from sentry.runner.decorators import configuration
 from sentry.signals import post_upgrade
 from sentry.silo.base import SiloMode
@@ -68,6 +69,16 @@ def _upgrade(
         # Run migrations on all non-read replica connections.
         # This is used for sentry.io as our production database runs on multiple hosts.
         if not settings.DATABASES[db_conn].get("REPLICA_OF", False):
+            # We want the noop case to be quickly skipped.
+            click.echo(f"Checking for migrations to run for {db_conn}")
+            conn = connections[db_conn]
+            executor = SentryMigrationExecutor(conn)
+            targets = executor.loader.graph.leaf_nodes()
+            plan = executor.migration_plan(targets)
+            if not plan:
+                click.echo(f"No migrations to run for {db_conn}")
+                continue
+
             click.echo(f"Running migrations for {db_conn}")
             dj_call_command(
                 "migrate",