refactor: Improve endpoint name uniqueness handling in create_flow function

src/backend/base/langflow/api/v1/flows.py

@@ -50,6 +50,23 @@ def create_flow(
                 flow.name = f"{flow.name} ({max(numbers) + 1})"
             else:
                 flow.name = f"{flow.name} (1)"
+        # Now check if the endpoint is unique
+        if session.exec(
+            select(Flow).where(Flow.endpoint_name == flow.endpoint_name).where(Flow.user_id == current_user.id)
+        ).first():
+            flows = session.exec(
+                select(Flow)
+                .where(Flow.endpoint_name.like(f"{flow.endpoint_name}-%"))
+                .where(Flow.user_id == current_user.id)
+            ).all()
+            if flows:
+                # The endpoitn name is like "my-endpoint","my-endpoint-1", "my-endpoint-2"
+                # so we need to get the highest number and add 1
+                # we need to get the last part of the endpoint name
+                numbers = [int(flow.endpoint_name.split("-")[-1]) for flow in flows]
+                flow.endpoint_name = f"{flow.endpoint_name}-{max(numbers) + 1}"
+            else:
+                flow.endpoint_name = f"{flow.endpoint_name}-1"
 
         db_flow = Flow.model_validate(flow, from_attributes=True)
         db_flow.updated_at = datetime.now(timezone.utc)