diff --git a/backend/alembic/versions/057_project_collab_prep.py b/backend/alembic/versions/057_project_collab_prep.py
index 7b2263b..d3755bf 100644
--- a/backend/alembic/versions/057_project_collab_prep.py
+++ b/backend/alembic/versions/057_project_collab_prep.py
@@ -17,27 +17,11 @@ depends_on = None
 
 def upgrade() -> None:
     # 1a. Performance indexes for project_tasks
-    op.create_index(
-        "ix_project_tasks_project_id",
-        "project_tasks",
-        ["project_id"],
-    )
-    op.create_index(
-        "ix_project_tasks_parent_task_id",
-        "project_tasks",
-        ["parent_task_id"],
-        postgresql_where=sa.text("parent_task_id IS NOT NULL"),
-    )
-    op.create_index(
-        "ix_project_tasks_project_updated",
-        "project_tasks",
-        ["project_id", sa.text("updated_at DESC")],
-    )
-    op.create_index(
-        "ix_projects_user_updated",
-        "projects",
-        ["user_id", sa.text("updated_at DESC")],
-    )
+    # Use IF NOT EXISTS to handle indexes that may already exist on the DB
+    op.execute("CREATE INDEX IF NOT EXISTS ix_project_tasks_project_id ON project_tasks (project_id)")
+    op.execute("CREATE INDEX IF NOT EXISTS ix_project_tasks_parent_task_id ON project_tasks (parent_task_id) WHERE parent_task_id IS NOT NULL")
+    op.execute("CREATE INDEX IF NOT EXISTS ix_project_tasks_project_updated ON project_tasks (project_id, updated_at DESC)")
+    op.execute("CREATE INDEX IF NOT EXISTS ix_projects_user_updated ON projects (user_id, updated_at DESC)")
 
     # 1b. Add user_id to task_comments for multi-user attribution
     op.add_column(
@@ -52,11 +36,7 @@ def upgrade() -> None:
     )
 
     # Calendar delta polling index (Phase 4 prep)
-    op.create_index(
-        "ix_events_calendar_updated",
-        "calendar_events",
-        ["calendar_id", sa.text("updated_at DESC")],
-    )
+    op.execute("CREATE INDEX IF NOT EXISTS ix_events_calendar_updated ON calendar_events (calendar_id, updated_at DESC)")
 
 
 def downgrade() -> None: