If I store data of type long long (such as 95811454522411188) into a WCDB database and then read and process it, I find that the data is different from before. By examining the source code, I discovered that long long is being stored as a double.

#import "NSNumber+WCTColumnCoding.h"

@implementation NSNumber (WCTColumnCoding)

+ (instancetype)unarchiveWithWCTValue:(NSNumber *)value
{
    return value;
}

- (NSNumber *)archivedWCTValue
{
    return self;
}

+ (WCTColumnType)columnType
{
    return WCTColumnTypeFloat;
}

@end

It's best to explicitly specify whether the database field type is long long or double.