fix: accept multiple dependency map importer for python

backend/migrations/20240220222323_remove_unique_index.down.sql

@@ -0,0 +1 @@
+-- Add down migration script here

backend/migrations/20240220222323_remove_unique_index.up.sql

@@ -0,0 +1,4 @@
+-- Add up migration script here
+DROP INDEX dependency_map_imported_path_idx;
+
+CREATE INDEX IF NOT EXISTS dependency_map_imported_path_idx ON dependency_map (workspace_id, imported_path);