{
    "required_tables": [
        {
            "name": "pmc_info",
            "required_columns": [
                "id",
                "guid",
                "nid",
                "pid",
                "agent_abs_index",
                "is_constant",
                "is_derived",
                "name",
                "description",
                "block",
                "expression"
            ],
            "validation_queries": [
                {
                    "comparison": "equals",
                    "description": "Check for missing PMC names",
                    "error_message": "PMC entries are missing a name",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_info_pmc WHERE name IS NULL OR name = ''"
                },
                {
                    "comparison": "equals",
                    "description": "Validate agent absolute index is non-negative",
                    "error_message": "Negative absolute_index found in agent metadata",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_info_agent WHERE absolute_index < 0"
                },
                {
                    "comparison": "equals",
                    "description": "Check derived PMCs have expressions",
                    "error_message": "Derived PMC missing valid expression",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_info_pmc WHERE is_derived = 1 AND (expression IS NULL OR expression = '')"
                },
                {
                    "comparison": "equals",
                    "description": "Validate description presence",
                    "error_message": "PMC entries missing description field",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_info_pmc WHERE description IS NULL OR description = ''"
                }
            ]
        },
        {
            "name": "rocpd_pmc_event",
            "required_columns": [
                "id",
                "guid",
                "event_id",
                "pmc_id",
                "value",
                "extdata"
            ],
            "validation_queries": [
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'id'",
                    "error_message": "NULL value found in 'id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_pmc_event WHERE id IS NULL"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'guid' where guid count > 3000",
                    "error_message": "NULL 'guid' found for guid values with more than 3000 occurrences",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_pmc_event WHERE guid IS NULL AND (SELECT COUNT(*) FROM rocpd_pmc_event WHERE guid = rocpd_pmc_event.guid) > 3000"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'event_id'",
                    "error_message": "NULL value found in 'event_id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_pmc_event WHERE event_id IS NULL"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'pmc_id'",
                    "error_message": "NULL value found in 'pmc_id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_pmc_event WHERE pmc_id IS NULL"
                }
            ]
        },
        {
            "name": "rocpd_sample",
            "required_columns": [
                "id",
                "guid",
                "track_id",
                "timestamp",
                "event_id"
            ],
            "validation_queries": [
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'id'",
                    "error_message": "NULL value found in 'id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_sample WHERE id IS NULL"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'guid' where guid count > 3000",
                    "error_message": "NULL 'guid' found for guid values with more than 3000 occurrences",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_sample WHERE guid IS NULL AND (SELECT COUNT(*) FROM rocpd_sample WHERE guid = rocpd_sample.guid) > 3000"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'track_id'",
                    "error_message": "NULL value found in 'track_id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_sample WHERE track_id IS NULL"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'timestamp'",
                    "error_message": "NULL value found in 'timestamp' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_sample WHERE timestamp IS NULL"
                },
                {
                    "comparison": "equals",
                    "description": "Check for NULL values in 'event_id'",
                    "error_message": "NULL value found in 'event_id' column",
                    "expected_result": 0,
                    "query": "SELECT COUNT(*) FROM rocpd_sample WHERE event_id IS NULL"
                }
            ]
        }
    ]
}