feat: Implement flow removal with associated records

packages/backend/src/graphql/mutations/delete-flow.ts

@@ -1,4 +1,6 @@
 import Context from '../../types/express/context';
+import Execution from '../../models/execution';
+import ExecutionStep from '../../models/execution-step';
 
 type Params = {
   input: {
@@ -11,14 +13,23 @@ const deleteFlow = async (
   params: Params,
   context: Context
 ) => {
-  await context.currentUser
+  const flow = await context.currentUser
     .$relatedQuery('flows')
-    .delete()
     .findOne({
       id: params.input.id,
     })
     .throwIfNotFound();
 
+  const executionIds = (
+    await flow.$relatedQuery('executions').select('executions.id')
+  ).map((execution: Execution) => execution.id);
+
+  await ExecutionStep.query().delete().whereIn('execution_id', executionIds);
+
+  await flow.$relatedQuery('executions').delete();
+  await flow.$relatedQuery('steps').delete();
+  await flow.$query().delete();
+
   return;
 };