# Function: grok_set_validation_params

## Overview
This function sets validation parameters and thresholds based on the specified validation type for materialized view health checks.

## Schema
`config.grok_set_validation_params`

## Parameters
- `validation_type` (text): Type of validation to configure: 'quick', 'daily', or 'full'

## Return Value
Returns a JSONB object containing validation parameters and thresholds:
```json
{
  "params": {
    "sample_percent": 0.1,
    "confidence": 0.95,
    "margin": 0.03
  },
  "mismatch_threshold": 0.1,
  "time_threshold": "3 days"
}
```

## Description
This function configures appropriate validation parameters and thresholds based on the specified validation type. It supports three validation modes, each with its own balance between thoroughness and performance:

1. **Quick** (default): Light validation for frequent checks
   - Sampling: 0.1% of records
   - Confidence level: 95%
   - Margin of error: 3%
   - Mismatch threshold: 0.1% (data mismatch tolerance)
   - Time threshold: 3 days (acceptable staleness)

2. **Daily**: Medium validation for daily maintenance
   - Sampling: 1% of records
   - Confidence level: 99%
   - Margin of error: 1%
   - Mismatch threshold: 0.05% (data mismatch tolerance)
   - Time threshold: 1 day (acceptable staleness)

3. **Full**: Thorough validation for critical checks
   - Sampling: 100% of records (full scan)
   - Confidence level: 99%
   - Margin of error: 0.5%
   - Mismatch threshold: 0.01% (data mismatch tolerance)
   - Time threshold: 12 hours (acceptable staleness)

If an invalid validation type is provided, the function defaults to 'quick' mode parameters.

## Parameter Explanations
- `sample_percent`: Percentage of records to sample during validation
- `confidence`: Statistical confidence level for sampling
- `margin`: Acceptable margin of error for sampling
- `mismatch_threshold`: Maximum acceptable percentage of mismatched records
- `time_threshold`: Maximum acceptable time since last refresh

## Dependencies
This function is likely called by other materialized view health check functions to configure validation parameters.

## Usage Example
```sql
-- Get validation parameters for daily checks
SELECT config.grok_set_validation_params('daily');

-- Get validation parameters for thorough health check
SELECT config.grok_set_validation_params('full');
```