refactor: Use limit to prevent fetching all records

packages/backend/src/models/flow.ts

@@ -91,6 +91,7 @@ class Flow extends Base {
   async lastInternalId() {
     const lastExecution = await this.$relatedQuery('executions')
       .orderBy('created_at', 'desc')
+      .limit(1)
       .first();
 
     return lastExecution ? (lastExecution as Execution).internalId : null;

packages/backend/src/models/step.ts

@@ -117,6 +117,7 @@ class Step extends Base {
   async getLastExecutionStep() {
     const lastExecutionStep = await this.$relatedQuery('executionSteps')
       .orderBy('created_at', 'desc')
+      .limit(1)
       .first();
 
     return lastExecutionStep;

packages/backend/src/models/user.ts

@@ -102,7 +102,7 @@ class User extends Base {
         to: 'users.id',
       },
       filter(builder: ExtendedQueryBuilder<UsageData>) {
-        builder.orderBy('created_at', 'desc').first();
+        builder.orderBy('created_at', 'desc').limit(1).first();
       },
     },
     subscriptions: {
@@ -121,7 +121,7 @@ class User extends Base {
         to: 'users.id',
       },
       filter(builder: ExtendedQueryBuilder<Subscription>) {
-        builder.orderBy('created_at', 'desc').first();
+        builder.orderBy('created_at', 'desc').limit(1).first();
       },
     },
   });