Refactor user and credential handling: rename Creds to User, update database migrations, and add targets subcommand for exporting users and subdomains

internal/sqlite/whois.go

@@ -536,37 +536,6 @@ func StoreWhoisRecord(whoisRecord WhoisRecord) error {
 	return nil
 }
 
-func StoreWhoisSubdomainRecords(subdomainRecords []SubdomainRecord) error {
-	if len(subdomainRecords) == 0 {
-		return nil
-	}
-
-	zap.L().Info("Storing subdomain records", zap.Int("count", len(subdomainRecords)))
-	db := GetDB()
-
-	// Use batch insert with conflict handling
-	const batchSize = 100
-	var lastErr error
-
-	for i := 0; i < len(subdomainRecords); i += batchSize {
-		end := i + batchSize
-		if end > len(subdomainRecords) {
-			end = len(subdomainRecords)
-		}
-
-		batch := subdomainRecords[i:end]
-		// Use Clauses with OnConflict DoNothing to skip conflicts
-		err := db.Clauses(clause.OnConflict{DoNothing: true}).CreateInBatches(&batch, batchSize).Error
-		if err != nil {
-			zap.L().Warn("Error storing some subdomain records", zap.Error(err))
-			lastErr = err
-			// Continue with next batch despite error
-		}
-	}
-
-	return lastErr
-}
-
 func StoreWhoisHistoryRecords(historyRecords []HistoryRecord) error {
 	if len(historyRecords) == 0 {
 		return nil