Add admin-configurable global query refresh cooldown to prevent unnecessary cost

[Lee2532]

Background

In environments using cost-based query engines such as BigQuery, each query execution incurs a direct cost. Currently, Redash allows users to freely refresh queries or dashboards without any restriction, which can lead to excessive and unnecessary query executions.

Problem

• Users can repeatedly trigger query executions without limits
• In cost-based systems (e.g., BigQuery), this results in unnecessary charges
• Accidental frequent refreshes can significantly increase operational costs
• No centralized control for administrators to mitigate this behavior

Proposed Solution

Introduce a global query refresh cooldown configurable by administrators.

Key Features

• Add a setting in the admin panel to define a minimum refresh interval (in seconds)
• Apply this cooldown globally to all users
• Prevent query execution if a user attempts to refresh within the configured interval

Expected Behavior

• Admin sets a cooldown value (e.g., 60 seconds)
• When a query is executed, the timestamp is recorded
• Any subsequent execution attempts within the cooldown period are rejected
• Queries can be executed normally once the cooldown period has passed

Motivation

This feature helps:

• Prevent unnecessary costs in systems like BigQuery
• Provide administrators with control over query execution frequency
• Improve cost efficiency and system stability in shared environments