refactor: optimize row handling in mssql extractor and transformer

.atl/skill-registry.md

@@ -1,24 +0,0 @@
-# Skill Registry — go-migrate
-
-Generated: 2026-04-21
-
-## Compact Rules
-
-### Go conventions
-- Use existing error wrapping pattern: `fmt.Errorf("context: %w", err)`
-- Channel-based pipeline — keep goroutine lifecycle clean (close channels in correct order)
-- No comments unless non-obvious WHY; no docstrings
-- Prefer named returns only when it aids clarity in short functions
-- Use `strings.EqualFold` for case-insensitive column name comparison
-
-### Project conventions
-- Config structs live in `internal/app/config/`
-- ETL interfaces live in `internal/app/etl/types.go`
-- Transformer implementations in `internal/app/etl/transformers/`
-- Azure operations via `internal/app/azure/main.go`
-- Per-job transformer creation (not shared) when job has storage config
-
-## User Skills
-| Trigger | Skill |
-|---------|-------|
-| sdd-* | SDD workflow skills |

.env.example

@@ -1,12 +1,2 @@
-SOURCE_DB_URL=sqlserver://sa:password@localhost:1433?database=master&packet+size=32767&loc=UTC
+PG_FROM_DB_URL=postgresql://postgres:password@localhost:5432/db
-TARGET_DB_URL=postgresql://postgres:password@localhost:5432/db
+PG_TO_DB_URL=postgresql://postgres:password@localhost:5432/db
-
-LOG_LEVEL=INFO
-
-AZ_STORAGE_ENABLED=false
-AZ_ACCOUNT_NAME=
-AZ_CONTAINER=
-AZ_ACCOUNT_KEY=
-AZ_USE_HTTPS=true
-AZ_SERVICE_URL=
-AZ_PREFIX=

.gitignore

@@ -27,5 +27,5 @@ go.work.sum
 
 # Editor/IDE
 # .idea/
-.vscode/
+# .vscode/
 .temp

cmd/go_migrate/connect.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"github.com/jackc/pgx/v5/pgxpool"
+	_ "github.com/microsoft/go-mssqldb"
+	log "github.com/sirupsen/logrus"
+)
+
+func connectToSqlServer() (*sql.DB, error) {
+	db, err := sql.Open("sqlserver", config.App.SourceDbUrl)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to connect to sqlserver: %w", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	if err := db.PingContext(ctx); err != nil {
+		return nil, fmt.Errorf("Unable to ping sqlserver: %w", err)
+	}
+
+	return db, nil
+}
+
+func connectToPostgres() (*pgxpool.Pool, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	pool, err := pgxpool.New(ctx, config.App.TargetDbUrl)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to connect to postgres: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("Unable to ping postgres: %w", err)
+	}
+
+	return pool, nil
+}
+
+func connectToDatabases() (*sql.DB, *pgxpool.Pool, error) {
+	var sourceDbErr, targetDbErr error
+	var sourceDb *sql.DB
+	var targetDb *pgxpool.Pool
+	var wg sync.WaitGroup
+
+	wg.Go(func() {
+		sourceDb, sourceDbErr = connectToSqlServer()
+		if sourceDbErr != nil {
+			log.Error("Unable to connect to source db: ", sourceDbErr)
+		}
+	})
+
+	wg.Go(func() {
+		targetDb, targetDbErr = connectToPostgres()
+		if targetDbErr != nil {
+			log.Error("Unable to connect to target db: ", targetDbErr)
+		}
+	})
+
+	wg.Wait()
+
+	if sourceDbErr != nil || targetDbErr != nil {
+		return nil, nil, errors.New("Unable to connect to databases")
+	}
+
+	return sourceDb, targetDb, nil
+}

cmd/go_migrate/log.go

@@ -3,7 +3,6 @@ package main
 import (
 	"time"
 
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -14,13 +13,5 @@ func configureLog() {
 		DisableSorting:  false,
 		PadLevelText:    true,
 	})
-
+	log.SetLevel(log.DebugLevel)
-	logLevelEnv := config.App.LogLevel
-	logLevel, err := log.ParseLevel(logLevelEnv)
-	if err != nil {
-		log.Warnf("Nivel de log inválido '%s', usando INFO por defecto", logLevelEnv)
-		logLevel = log.InfoLevel
-	}
-
-	log.SetLevel(logLevel)
 }

cmd/go_migrate/main.go

@@ -5,13 +5,12 @@ import (
 	"sync"
 	"time"
 
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/azure"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	dbwrapper "git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/extractors"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/loaders"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/table_analyzers"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/transformers"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
 )
@@ -96,10 +95,10 @@ func processMigrationJobs(
 	targetDb dbwrapper.DbWrapper,
 	jobs []config.Job,
 	maxParallelWorkers int,
-) []models.JobResult {
+) []JobResult {
 	if len(jobs) == 0 {
 		log.Info("No migration jobs configured")
-		return []models.JobResult{}
+		return []JobResult{}
 	}
 
 	if maxParallelWorkers <= 0 {
@@ -112,23 +111,15 @@ func processMigrationJobs(
 
 	log.Infof("Starting migration with %d parallel worker(s)", maxParallelWorkers)
 
-	chJobResults := make(chan models.JobResult, len(jobs))
+	chJobResults := make(chan JobResult, len(jobs))
 	chJobs := make(chan config.Job, len(jobs))
 	var wgJobs sync.WaitGroup
 
 	sourceTableAnalyzer := table_analyzers.NewMssqlTableAnalyzer(sourceDb)
 	targetTableAnalyzer := table_analyzers.NewPostgresTableAnalyzer(targetDb)
 	extractor := extractors.NewMssqlExtractor(sourceDb)
-	loader := loaders.NewGenericLoader(targetDb)
+	transformer := transformers.NewMssqlTransformer()
-
+	loader := loaders.NewPostgresLoader(targetDb)
-	var azureClient *azure.Client
-	if config.App.AzureStorage.Enabled {
-		var err error
-		azureClient, err = azure.NewClient(config.App.AzureStorage)
-		if err != nil {
-			log.Fatalf("Failed to create Azure storage client: %v", err)
-		}
-	}
 
 	for i := range maxParallelWorkers {
 		wgJobs.Go(func() {
@@ -140,10 +131,9 @@ func processMigrationJobs(
 					sourceTableAnalyzer,
 					targetTableAnalyzer,
 					extractor,
-					azureClient,
+					transformer,
 					loader,
 					job,
-					targetDb.GetDialect(),
 				)
 
 				chJobResults <- res
@@ -161,7 +151,7 @@ func processMigrationJobs(
 		close(chJobResults)
 	}()
 
-	var finalResults []models.JobResult
+	var finalResults []JobResult
 	for res := range chJobResults {
 		finalResults = append(finalResults, res)
 	}

cmd/go_migrate/metrics.go

@@ -0,0 +1,13 @@
+package main
+
+import "time"
+
+type JobResult struct {
+	JobName    string
+	StartTime  time.Time
+	Duration   time.Duration
+	RowsRead   int64
+	RowsLoaded int64
+	RowsFailed int64
+	Error      error
+}

cmd/go_migrate/process.go

@@ -7,49 +7,31 @@ import (
 	"sync/atomic"
 	"time"
 
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/azure"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	dbwrapper "git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/extractors"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/table_analyzers"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/transformers"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
 )
 
-func buildTruncateQuery(targetDbType, schema, table, truncateMethod string) string {
-	if truncateMethod == "DELETE" {
-		if targetDbType == "postgres" {
-			return fmt.Sprintf(`DELETE FROM "%s"."%s"`, schema, table)
-		}
-		return fmt.Sprintf(`DELETE FROM [%s].[%s]`, schema, table)
-	}
-
-	if targetDbType == "postgres" {
-		return fmt.Sprintf(`TRUNCATE TABLE "%s"."%s"`, schema, table)
-	}
-	return fmt.Sprintf(`TRUNCATE TABLE [%s].[%s]`, schema, table)
-}
-
 func processMigrationJob(
 	ctx context.Context,
 	targetDbWrapper dbwrapper.DbWrapper,
 	sourceTableAnalyzer etl.TableAnalyzer,
 	targetTableAnalyzer etl.TableAnalyzer,
 	extractor etl.Extractor,
-	azureClient *azure.Client,
+	transformer etl.Transformer,
 	loader etl.Loader,
 	job config.Job,
-	targetDbType string,
+) JobResult {
-) models.JobResult {
-	transformer := transformers.NewMssqlTransformer(job.ToStorage, job.SourceTable, azureClient)
 	localCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	result := models.JobResult{
+	result := JobResult{
 		JobName:   job.Name,
 		StartTime: time.Now(),
 	}
@@ -85,13 +67,7 @@ func processMigrationJob(
 		return result
 	}
 
-	preSqlQueries := job.TargetTable.PreSQL
+	for _, query := range job.PreSQL {
-	if job.TruncateTarget {
-		truncateQuery := buildTruncateQuery(targetDbType, job.TargetTable.Schema, job.TargetTable.Table, job.TruncateMethod)
-		preSqlQueries = append([]string{truncateQuery}, job.TargetTable.PreSQL...)
-	}
-
-	for _, query := range preSqlQueries {
 		if _, err := targetDbWrapper.Exec(localCtx, query); err != nil {
 			result.Error = err
 			return result
@@ -104,14 +80,12 @@ func processMigrationJob(
 		job.SourceTable.TableInfo,
 		job.SourceTable.PrimaryKey,
 		job.RowsPerPartition,
-		job.Range,
 	)
 	if err != nil {
 		log.Error("Unexpected error calculating batch ranges: ", err)
 	}
 
 	chJobErrors := make(chan custom_errors.JobError, job.QueueSize)
-	chExtractorErrors := make(chan custom_errors.ExtractorError, job.QueueSize)
 	chLoadersErrors := make(chan custom_errors.LoaderError, job.QueueSize)
 	chPartitions := make(chan models.Partition, job.QueueSize)
 	chBatchesRaw := make(chan models.Batch, job.QueueSize)
@@ -131,15 +105,6 @@ func processMigrationJob(
 		}
 	}()
 
-	go custom_errors.ExtractorErrorHandler(
-		localCtx,
-		job.Retry,
-		job.MaxPartitionErrrors,
-		chExtractorErrors,
-		chPartitions,
-		chJobErrors,
-		&wgActivePartitions,
-	)
 	go custom_errors.LoaderErrorHandler(
 		localCtx,
 		job.Retry,
@@ -163,7 +128,6 @@ func processMigrationJob(
 				job.BatchSize,
 				chPartitions,
 				chBatchesRaw,
-				chExtractorErrors,
 				chJobErrors,
 				&wgActivePartitions,
 				&rowsRead,
@@ -217,8 +181,6 @@ func processMigrationJob(
 		log.Debugf("wgActivePartitions is empty (%v)", job.Name)
 		close(chPartitions)
 		log.Debugf("chPartitions is closed (%v)", job.Name)
-		close(chExtractorErrors)
-		log.Debugf("chExtractorErrors is closed (%v)", job.Name)
 
 		wgExtractors.Wait()
 		log.Debugf("wgExtractors is empty (%v)", job.Name)
@@ -241,7 +203,7 @@ func processMigrationJob(
 		cancel()
 	}()
 
-	for _, query := range job.TargetTable.PostSQL {
+	for _, query := range job.PostSQL {
 		if _, err := targetDbWrapper.Exec(localCtx, query); err != nil {
 			result.Error = err
 			return result

config.yaml

@@ -30,6 +30,7 @@ jobs:
       table: MANZANA
     pre_sql: 
       - 'SELECT 1'
+      # - 'TRUNCATE TABLE "Cartografia"."MANZANA"'
     range:
       min: 1000000
       max: 2000000
@@ -47,19 +48,6 @@ jobs:
       table: PUERTO
     pre_sql: 
       - 'SELECT 1'
+      # - 'TRUNCATE TABLE "Red"."PUERTO"'
     post_sql: 
       - "SELECT 1"
-
-  - name: red_terminal__attach
-    source:
-      schema: Red
-      table: TERMINAL__ATTACH
-      primary_key: GDB_ARCHIVE_OID
-    target:
-      schema: Red
-      table: TERMINAL__ATTACH
-    to_storage:
-      columns:
-        - source: DATA
-          target: FILE_URL
-          mode: REFERENCE_ONLY # REFERENCE_ONLY | DUPLICATE_WITH_REF

go.mod

@@ -1,10 +1,8 @@
 module git.ksdemosapps.com/kylesoda/go-migrate
 
-go 1.26
+go 1.25.7
 
 require (
-	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.4
-	github.com/caarlos0/env/v11 v11.4.0
 	github.com/gaspardle/go-mssqlclrgeo v0.0.0-20160129143314-97ceabf987a4
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.9.1
@@ -17,17 +15,15 @@ require (
 )
 
 require (
-	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.21.0 // indirect
-	github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2 // indirect
 	github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 // indirect
 	github.com/golang-sql/sqlexp v0.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
 	golang.org/x/crypto v0.48.0 // indirect
-	golang.org/x/net v0.51.0 // indirect
 	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.34.0 // indirect
 )

go.sum

@@ -4,14 +4,10 @@ github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1 h1:Hk5QBxZQC1jb2Fwj6mpz
 github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.13.1/go.mod h1:IYus9qsFobWIc2YVwe/WPjcnyCkPKtnHAqUYeebc8z0=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2 h1:9iefClla7iYpfYWdzPCRDozdmndjTm8DXdpCzPajMgA=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2/go.mod h1:XtLgD3ZD34DAaVIIAyG3objl5DynM3CQ/vMcbBNJZGI=
-github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/storage/armstorage v1.8.1 h1:/Zt+cDPnpC3OVDm/JKLOs7M2DKmLRIIp3XIx9pHHiig=
-github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/storage/armstorage v1.8.1/go.mod h1:Ng3urmn6dYe8gnbCMoHHVl5APYz2txho3koEkV2o2HA=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.4.0 h1:E4MgwLBGeVB5f2MdcIVD3ELVAWpr+WD6MUe1i+tM/PA=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.4.0/go.mod h1:Y2b/1clN4zsAoUd/pgNAQHjLDnTis/6ROkUfyob6psM=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.2.0 h1:nCYfgcSyHZXJI8J0IWE5MsCGlb2xp9fJiXyxWgmOFg4=
 github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.2.0/go.mod h1:ucUjca2JtSZboY8IoUqyQyuuXvwbMBVwFOm0vdQPNhA=
-github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.4 h1:jWQK1GI+LeGGUKBADtcH2rRqPxYB1Ljwms5gFA2LqrM=
-github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.4/go.mod h1:8mwH4klAm9DUgR2EEHyEEAQlRDvLPyg5fQry3y+cDew=
 github.com/AzureAD/microsoft-authentication-library-for-go v1.6.0 h1:XRzhVemXdgvJqCH0sFfrBUTnUJSBrBf7++ypk+twtRs=
 github.com/AzureAD/microsoft-authentication-library-for-go v1.6.0/go.mod h1:HKpQxkWaGLJ+D/5H8QRpyQXA1eKjxkFlOMwck5+33Jk=
 github.com/DATA-DOG/go-sqlmock v1.5.2 h1:OcvFkGmslmlZibjAjaHm3L//6LiuBgolP7OputlJIzU=
@@ -20,8 +16,7 @@ github.com/alecthomas/assert/v2 v2.10.0 h1:jjRCHsj6hBJhkmhznrCzoNpbA3zqy0fYiUcYZ
 github.com/alecthomas/assert/v2 v2.10.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
 github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
 github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
-github.com/caarlos0/env/v11 v11.4.0 h1:Kcb6t5kIIr4XkoQC9AF2j+8E1Jsrl3Wz/hhm1LtoGAc=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/caarlos0/env/v11 v11.4.0/go.mod h1:qupehSf/Y0TUTsxKywqRt/vJjN5nz6vauiYEUUr8P4U=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -47,8 +42,8 @@ github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo
 github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
-github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=

internal/app/azure/main.go

@@ -1,87 +0,0 @@
-package azure
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net/url"
-
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob"
-)
-
-var (
-	ErrInvalidConnectionString = errors.New("invalid connection string")
-	ErrContainerNotFound       = errors.New("container not found")
-	ErrBlobNotFound            = errors.New("blob not found")
-	ErrInvalidInput            = errors.New("invalid input parameters")
-)
-
-type Client struct {
-	client             *azblob.Client
-	azureStorageConfig config.AzureStorageConfig
-}
-
-func NewClient(azureStorageConfig config.AzureStorageConfig) (*Client, error) {
-	protocol := "https"
-	if !azureStorageConfig.UseHTTPS {
-		protocol = "http"
-	}
-
-	blobEndpoint, _ := url.JoinPath(azureStorageConfig.ServiceURL, azureStorageConfig.AccountName)
-	connStr := fmt.Sprintf("DefaultEndpointsProtocol=%s;AccountName=%s;AccountKey=%s;BlobEndpoint=%s;",
-		protocol, azureStorageConfig.AccountName, azureStorageConfig.AccountKey, blobEndpoint)
-
-	client, err := azblob.NewClientFromConnectionString(connStr, nil)
-	if err != nil {
-		return nil, fmt.Errorf("creating azure storage client: %w", err)
-	}
-
-	return &Client{
-		client:             client,
-		azureStorageConfig: azureStorageConfig,
-	}, nil
-}
-
-func (c *Client) CreateContainer(ctx context.Context, containerName string) error {
-	if containerName == "" {
-		return ErrInvalidInput
-	}
-
-	_, err := c.client.CreateContainer(ctx, containerName, nil)
-	if err != nil {
-		return fmt.Errorf("creating container %s: %w", containerName, err)
-	}
-	return nil
-}
-
-func (c *Client) UploadBuffer(ctx context.Context, containerName, blobPath string, buffer []byte) error {
-	if containerName == "" || blobPath == "" || buffer == nil {
-		return ErrInvalidInput
-	}
-
-	_, err := c.client.UploadBuffer(ctx, containerName, blobPath, buffer, nil)
-	if err != nil {
-		return fmt.Errorf("uploading blob %s: %w", blobPath, err)
-	}
-	return nil
-}
-
-func (c *Client) UploadAndGetURL(ctx context.Context, blobPath string, buffer []byte) (string, error) {
-	if blobPath == "" || buffer == nil {
-		return "", ErrInvalidInput
-	}
-
-	fullPath := blobPath
-	if c.azureStorageConfig.Prefix != "" {
-		fullPath, _ = url.JoinPath(c.azureStorageConfig.Prefix, blobPath)
-	}
-
-	if err := c.UploadBuffer(ctx, c.azureStorageConfig.Container, fullPath, buffer); err != nil {
-		return "", err
-	}
-
-	blobEndpoint, _ := url.JoinPath(c.azureStorageConfig.ServiceURL, c.azureStorageConfig.AccountName)
-	blobURL, _ := url.JoinPath(blobEndpoint, c.azureStorageConfig.Container, fullPath)
-	return blobURL, nil
-}

internal/app/config/main.go

@@ -1,40 +1,41 @@
 package config
 
 import (
-	"github.com/caarlos0/env/v11"
+	"os"
+
 	"github.com/joho/godotenv"
 	log "github.com/sirupsen/logrus"
 )
 
-type AzureStorageConfig struct {
+type appConfig struct {
-	AccountName string `env:"AZ_ACCOUNT_NAME"`
+	SourceDbUrl string
-	Container   string `env:"AZ_CONTAINER"`
+	TargetDbUrl string
-	AccountKey  string `env:"AZ_ACCOUNT_KEY"`
-	UseHTTPS    bool   `env:"AZ_USE_HTTPS" envDefault:"true"`
-	ServiceURL  string `env:"AZ_SERVICE_URL"`
-	Prefix      string `env:"AZ_PREFIX"`
-	Enabled     bool   `env:"AZ_STORAGE_ENABLED"`
 }
 
-type appConfig struct {
+func loadEnv() {
-	SourceDbUrl  string `env:"SOURCE_DB_URL,required"`
+	err := godotenv.Load()
-	TargetDbUrl  string `env:"TARGET_DB_URL,required"`
+	if err != nil {
-	LogLevel     string `env:"LOG_LEVEL" envDefault:"INFO"`
+		log.Warn("Warning: could not load .env file")
-	AzureStorage AzureStorageConfig
+	}
 }
 
 func getAppConfig() appConfig {
-	if err := godotenv.Load(); err != nil {
+	loadEnv()
-		log.Warn("Could not load .env file")
+
+	sourceDbUrl := os.Getenv("SOURCE_DB_URL")
+	if sourceDbUrl == "" {
+		log.Fatal("SOURCE_DB_URL environment variable not set")
 	}
 
-	cfg := appConfig{}
+	targetDbUrl := os.Getenv("TARGET_DB_URL")
-
+	if targetDbUrl == "" {
-	if err := env.Parse(&cfg); err != nil {
+		log.Fatal("TARGET_DB_URL environment variable not set")
-		log.Fatalf("Error al cargar variables de entorno: %v", err)
 	}
 
-	return cfg
+	return appConfig{
+		SourceDbUrl: sourceDbUrl,
+		TargetDbUrl: targetDbUrl,
+	}
 }
 
 var App appConfig = getAppConfig()

internal/app/config/migration.go

@@ -14,16 +14,6 @@ type RetryConfig struct {
 	MaxJitterMs int `yaml:"max_jitter_ms"`
 }
 
-type ToStorageColumnConfig struct {
-	Source string `yaml:"source"`
-	Target string `yaml:"target"`
-	Mode   string `yaml:"mode"`
-}
-
-type ToStorageConfig struct {
-	Columns []ToStorageColumnConfig `yaml:"columns"`
-}
-
 type JobConfig struct {
 	MaxExtractors       int         `yaml:"max_extractors"`
 	MaxLoaders          int         `yaml:"max_loaders"`
@@ -36,7 +26,6 @@ type JobConfig struct {
 	MaxChunkErrors      int         `yaml:"max_chunk_errors"`
 	Retry               RetryConfig `yaml:"retry"`
 	RowsPerPartition    int64
-	ToStorage           ToStorageConfig `yaml:"to_storage"`
 }
 
 type TableInfo struct {
@@ -44,31 +33,29 @@ type TableInfo struct {
 	Table  string `yaml:"table"`
 }
 
+type TargetTableInfo struct {
+	TableInfo `yaml:",inline"`
+}
+
 type SourceTableInfo struct {
 	TableInfo  `yaml:",inline"`
 	PrimaryKey string `yaml:"primary_key"`
 }
 
-type TargetTableInfo struct {
-	TableInfo `yaml:",inline"`
-	PreSQL    []string `yaml:"pre_sql"`
-	PostSQL   []string `yaml:"post_sql"`
-}
-
-type RangeConfig struct {
-	Min            int64 `yaml:"min"`
-	Max            int64 `yaml:"max"`
-	IsMinInclusive bool  `yaml:"is_min_inclusive"`
-	IsMaxInclusive bool  `yaml:"is_max_inclusive"`
-}
-
 type Job struct {
 	Name        string          `yaml:"name"`
 	Enabled     bool            `yaml:"enabled"`
 	SourceTable SourceTableInfo `yaml:"source"`
 	TargetTable TargetTableInfo `yaml:"target"`
+	PreSQL      []string        `yaml:"pre_sql"`
+	PostSQL     []string        `yaml:"post_sql"`
 	JobConfig   `yaml:",inline"`
-	Range       RangeConfig `yaml:"range"`
+	Range       struct {
+		Min            int64 `yaml:"min"`
+		Max            int64 `yaml:"max"`
+		IsMinInclusive bool  `yaml:"is_min_inclusive"`
+		IsMaxInclusive bool  `yaml:"is_max_inclusive"`
+	}
 }
 
 type MigrationConfig struct {

internal/app/custom_errors/extractor.error.go

@@ -1,13 +1,7 @@
 package custom_errors
 
 import (
-	"context"
-	"fmt"
-	"sync"
-
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
-	"github.com/google/uuid"
 )
 
 type ExtractorError struct {
@@ -20,100 +14,3 @@ type ExtractorError struct {
 func (e *ExtractorError) Error() string {
 	return e.Msg
 }
-
-func ExtractorErrorHandler(
-	ctx context.Context,
-	retryConfig config.RetryConfig,
-	maxPartitionErrors int,
-	chErrorsIn <-chan ExtractorError,
-	chPartitionsOut chan<- models.Partition,
-	chJobErrorsOut chan<- JobError,
-	wgActivePartitions *sync.WaitGroup,
-) {
-	definitiveErrors := 0
-
-	for {
-		if ctx.Err() != nil {
-			return
-		}
-
-		select {
-		case <-ctx.Done():
-			return
-
-		case err, ok := <-chErrorsIn:
-			if !ok {
-				return
-			}
-
-			if err.Partition.RetryCounter >= retryConfig.Attempts {
-				wgActivePartitions.Done()
-				definitiveErrors++
-				jobError := JobError{
-					ShouldCancelJob: false,
-					Msg:             fmt.Sprintf("Partition %v reached max retries (%d)", err.Partition.Id, retryConfig.Attempts),
-					Prev:            &err,
-				}
-
-				select {
-				case chJobErrorsOut <- jobError:
-				case <-ctx.Done():
-					return
-				}
-
-				if maxPartitionErrors > 0 && definitiveErrors >= maxPartitionErrors {
-					fatalError := JobError{
-						ShouldCancelJob: true,
-						Msg:             fmt.Sprintf("Partition error limit reached (%d)", maxPartitionErrors),
-						Prev:            &err,
-					}
-
-					select {
-					case chJobErrorsOut <- fatalError:
-					case <-ctx.Done():
-						return
-					}
-				}
-
-				continue
-			} else {
-				jobError := JobError{
-					ShouldCancelJob: false,
-					Msg:             fmt.Sprintf("Temporal error in partition %v (retries: %d)", err.Partition.Id, err.Partition.RetryCounter),
-					Prev:            &err,
-				}
-
-				select {
-				case chJobErrorsOut <- jobError:
-				case <-ctx.Done():
-					return
-				}
-			}
-
-			newPartition := err.Partition
-			newPartition.RetryCounter++
-
-			delay := computeBackoffDelay(
-				newPartition.RetryCounter,
-				retryConfig.BaseDelayMs,
-				retryConfig.MaxDelayMs,
-				retryConfig.MaxJitterMs,
-			)
-
-			if err.HasLastId {
-				newPartition.ParentId = err.Partition.Id
-				newPartition.Id = uuid.New()
-				newPartition.Range.Min = err.LastId
-				newPartition.Range.IsMinInclusive = false
-			}
-
-			requeueWithBackoff(ctx, delay, func() {
-				select {
-				case chPartitionsOut <- newPartition:
-				case <-ctx.Done():
-					return
-				}
-			})
-		}
-	}
-}

internal/app/etl/extractors/consumer.go

@@ -0,0 +1,92 @@
+package extractors
+
+import (
+	"context"
+	"errors"
+	"slices"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+)
+
+func Consume(
+	ctx context.Context,
+	extractor etl.Extractor,
+	tableInfo config.SourceTableInfo,
+	columns []models.ColumnType,
+	batchSize int,
+	chPartitionsIn <-chan models.Partition,
+	chBatchesOut chan<- models.Batch,
+	chErrorsOut chan<- custom_errors.JobError,
+	wgActivePartitions *sync.WaitGroup,
+	rowsRead *int64,
+) {
+	indexPrimaryKey := slices.IndexFunc(columns, func(col models.ColumnType) bool {
+		return strings.EqualFold(col.Name(), tableInfo.PrimaryKey)
+	})
+
+	if indexPrimaryKey == -1 {
+		select {
+		case <-ctx.Done():
+			return
+		case chErrorsOut <- custom_errors.JobError{
+			ShouldCancelJob: true,
+			Msg:             "Primary key not found in provided columns",
+		}:
+		}
+		return
+	}
+
+	for {
+		if ctx.Err() != nil {
+			return
+		}
+
+		select {
+		case <-ctx.Done():
+			return
+		case partition, ok := <-chPartitionsIn:
+			if !ok {
+				return
+			}
+
+			rowsReadResult, err := extractWithRetries(
+				ctx,
+				extractor,
+				tableInfo,
+				columns,
+				batchSize,
+				partition,
+				indexPrimaryKey,
+				chBatchesOut,
+			)
+			wgActivePartitions.Done()
+
+			if rowsReadResult > 0 {
+				atomic.AddInt64(rowsRead, rowsReadResult)
+			}
+
+			if err != nil {
+				var jobError *custom_errors.JobError
+				if errors.As(err, &jobError) {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- *jobError:
+					}
+				} else {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- custom_errors.JobError{ShouldCancelJob: false, Msg: err.Error(), Prev: err}:
+					}
+				}
+			}
+		}
+	}
+}

internal/app/etl/extractors/extract-with-retries.go

@@ -0,0 +1,70 @@
+package extractors
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"github.com/google/uuid"
+)
+
+func extractWithRetries(
+	ctx context.Context,
+	extractor etl.Extractor,
+	tableInfo config.SourceTableInfo,
+	columns []models.ColumnType,
+	batchSize int,
+	partition models.Partition,
+	indexPrimaryKey int,
+	chBatchesOut chan<- models.Batch,
+) (int64, error) {
+	var totalRowsRead int64
+	delay := time.Duration(time.Second * 1)
+	currentParitition := partition
+
+	for {
+		rowsRead, err := extractor.Exec(
+			ctx,
+			tableInfo,
+			columns,
+			batchSize,
+			currentParitition,
+			indexPrimaryKey,
+			chBatchesOut,
+		)
+		totalRowsRead += rowsRead
+
+		if err == nil {
+			return totalRowsRead, nil
+		}
+
+		var exError *custom_errors.ExtractorError
+		if errors.As(err, &exError) {
+			currentParitition.RetryCounter++
+
+			if currentParitition.RetryCounter > 3 {
+				return totalRowsRead, &custom_errors.JobError{
+					Msg:  fmt.Sprintf("Partition %v reached max retries", exError.Partition.Id),
+					Prev: err,
+				}
+			}
+
+			if exError.HasLastId {
+				currentParitition.ParentId = exError.Partition.Id
+				currentParitition.Id = uuid.New()
+				currentParitition.Range.Min = exError.LastId
+				currentParitition.Range.IsMinInclusive = false
+			}
+
+			time.Sleep(delay)
+			continue
+		}
+
+		return totalRowsRead, err
+	}
+}

internal/app/etl/extractors/main.go

@@ -2,100 +2,63 @@ package extractors
 
 import (
 	"context"
-	"errors"
+	"fmt"
-	"slices"
-	"strings"
-	"sync"
-	"sync/atomic"
 
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/convert"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"github.com/google/uuid"
 )
 
-func Consume(
+func errorFromLastPartitionRow(
-	ctx context.Context,
+	lastRow models.UnknownRowValues,
-	extractor etl.Extractor,
+	indexPrimaryKey int,
-	tableInfo config.SourceTableInfo,
+	partition models.Partition,
-	columns []models.ColumnType,
+	previousError error,
-	batchSize int,
+) error {
-	chPartitionsIn <-chan models.Partition,
+	lastIdRawValue := lastRow[indexPrimaryKey]
-	chBatchesOut chan<- models.Batch,
-	chErrorsOut chan<- custom_errors.ExtractorError,
-	chJobErrorsOut chan<- custom_errors.JobError,
-	wgActivePartitions *sync.WaitGroup,
-	rowsRead *int64,
-) {
-	indexPrimaryKey := slices.IndexFunc(columns, func(col models.ColumnType) bool {
-		return strings.EqualFold(col.Name(), tableInfo.PrimaryKey)
-	})
 
-	if indexPrimaryKey == -1 {
+	lastId, ok := convert.ToInt64(lastIdRawValue)
-		select {
-		case <-ctx.Done():
-			return
-		case chJobErrorsOut <- custom_errors.JobError{
-			ShouldCancelJob: true,
-			Msg:             "Primary key not found in provided columns",
-		}:
-		}
-
-		return
-	}
-
-	for {
-		if ctx.Err() != nil {
-			return
-		}
-
-		select {
-		case <-ctx.Done():
-			return
-		case partition, ok := <-chPartitionsIn:
 	if !ok {
-				return
+		currentPartition := partition
+		currentPartition.RetryCounter = 3
+		return &custom_errors.ExtractorError{
+			Partition: currentPartition,
+			HasLastId: true,
+			Msg:       fmt.Sprintf("Couldn't cast last id value as int: %s", previousError.Error()),
 		}
 
-			rowsReadResult, err := extractor.Exec(
-				ctx,
-				tableInfo,
-				columns,
-				batchSize,
-				partition,
-				indexPrimaryKey,
-				chBatchesOut,
-			)
-
-			if rowsReadResult > 0 {
-				atomic.AddInt64(rowsRead, int64(rowsReadResult))
 	}
 
-			if err != nil {
+	return &custom_errors.ExtractorError{
-				if exError, ok := errors.AsType[*custom_errors.ExtractorError](err); ok {
+		Partition: partition,
+		HasLastId: true,
+		LastId:    lastId,
+		Msg:       previousError.Error(),
+	}
+}
+
+func sendBatch(ctx context.Context, chBatchesOut chan<- models.Batch, batch models.Batch) error {
 	select {
+	case chBatchesOut <- batch:
+		return nil
 	case <-ctx.Done():
-						return
+		return ctx.Err()
-					case chErrorsOut <- *exError:
-					}
-				} else if jobError, ok := errors.AsType[*custom_errors.JobError](err); ok {
-					select {
-					case <-ctx.Done():
-						return
-					case chJobErrorsOut <- *jobError:
-					}
-				} else {
-					select {
-					case <-ctx.Done():
-						return
-					case chErrorsOut <- custom_errors.ExtractorError{Partition: partition, Msg: err.Error()}:
 	}
 }
 
-				continue
+func flush(
+	ctx context.Context,
+	partition *models.Partition,
+	batchSize int,
+	batchRows []models.UnknownRowValues,
+	chBatchesOut chan<- models.Batch,
+) error {
+	if len(batchRows) == 0 {
+		return nil
 	}
 
-			wgActivePartitions.Done()
+	batch := models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows}
-		}
+	batchRows = make([]models.UnknownRowValues, 0, batchSize)
-	}
+	return sendBatch(ctx, chBatchesOut, batch)
 }

internal/app/etl/extractors/mssql.go

@@ -3,17 +3,13 @@ package extractors
 import (
 	"context"
 	"database/sql"
-	"errors"
 	"fmt"
 	"strings"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/convert"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	dbwrapper "git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
-	"github.com/google/uuid"
 )
 
 type MssqlExtractor struct {
@@ -29,9 +25,6 @@ func buildExtractQueryMssql(
 	columns []models.ColumnType,
 	includeRange bool,
 	isMinInclusive bool,
-	isMaxInclusive bool,
-	hasMin bool,
-	hasMax bool,
 ) string {
 	var sbQuery strings.Builder
 
@@ -55,32 +48,15 @@ func buildExtractQueryMssql(
 
 	fmt.Fprintf(&sbQuery, " FROM [%s].[%s]", tableInfo.Schema, tableInfo.Table)
 
-	if includeRange && (hasMin || hasMax) {
+	if includeRange {
-		sbQuery.WriteString(" WHERE ")
+		fmt.Fprintf(&sbQuery, " WHERE [%s]", tableInfo.PrimaryKey)
-
-		if hasMin {
-			fmt.Fprintf(&sbQuery, "[%s]", tableInfo.PrimaryKey)
 		if isMinInclusive {
 			sbQuery.WriteString(" >=")
 		} else {
 			sbQuery.WriteString(" >")
 		}
-			sbQuery.WriteString(" @min")
-		}
 
-		if hasMin && hasMax {
+		fmt.Fprintf(&sbQuery, " @min AND [%s] <= @max", tableInfo.PrimaryKey)
-			sbQuery.WriteString(" AND ")
-		}
-
-		if hasMax {
-			fmt.Fprintf(&sbQuery, "[%s]", tableInfo.PrimaryKey)
-			if isMaxInclusive {
-				sbQuery.WriteString(" <=")
-			} else {
-				sbQuery.WriteString(" <")
-			}
-			sbQuery.WriteString(" @max")
-		}
 	}
 
 	fmt.Fprintf(&sbQuery, " ORDER BY [%s] ASC", tableInfo.PrimaryKey)
@@ -88,34 +64,6 @@ func buildExtractQueryMssql(
 	return sbQuery.String()
 }
 
-func errorFromLastRow(
-	lastRow models.UnknownRowValues,
-	indexPrimaryKey int,
-	partition models.Partition,
-	previousError error,
-) *custom_errors.ExtractorError {
-	lastIdRawValue := lastRow[indexPrimaryKey]
-
-	lastId, ok := convert.ToInt64(lastIdRawValue)
-	if !ok {
-		currentPartition := partition
-		currentPartition.RetryCounter = 3
-		return &custom_errors.ExtractorError{
-			Partition: currentPartition,
-			HasLastId: true,
-			Msg:       fmt.Sprintf("Couldn't cast last id value as int: %s", previousError.Error()),
-		}
-
-	}
-
-	return &custom_errors.ExtractorError{
-		Partition: partition,
-		HasLastId: true,
-		LastId:    lastId,
-		Msg:       previousError.Error(),
-	}
-}
-
 func (mssqlEx *MssqlExtractor) Exec(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
@@ -124,86 +72,50 @@ func (mssqlEx *MssqlExtractor) Exec(
 	partition models.Partition,
 	indexPrimaryKey int,
 	chBatchesOut chan<- models.Batch,
-) (int, error) {
+) (int64, error) {
-	hasMin := partition.HasRange && partition.Range.Min > 0
+	query := buildExtractQueryMssql(tableInfo, columns, partition.HasRange, partition.Range.IsMinInclusive)
-	hasMax := partition.HasRange && partition.Range.Max > 0
-	query := buildExtractQueryMssql(tableInfo, columns, partition.HasRange, partition.Range.IsMinInclusive, partition.Range.IsMaxInclusive, hasMin, hasMax)
 
 	var queryArgs []any
-	if hasMin {
+	if partition.HasRange {
-		queryArgs = append(queryArgs, sql.Named("min", partition.Range.Min))
+		queryArgs = append(queryArgs, sql.Named("min", partition.Range.Min), sql.Named("max", partition.Range.Max))
-	}
-	if hasMax {
-		queryArgs = append(queryArgs, sql.Named("max", partition.Range.Max))
 	}
 
-	rowsRead := 0
 	rows, err := mssqlEx.db.Query(ctx, query, queryArgs...)
 	if err != nil {
-		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
+		return 0, err
 	}
 	defer rows.Close()
 
 	batchRows := make([]models.UnknownRowValues, 0, batchSize)
+	var rowsRead int64 = 0
 
 	for rows.Next() {
-		rowValues := make([]any, len(columns))
+		values, err := rows.Values()
-		scanArgs := make([]any, len(columns))
+		if err != nil {
-
+			if len(batchRows) == 0 {
-		for i := range rowValues {
+				return rowsRead, err
-			scanArgs[i] = &rowValues[i]
 			}
 
-		if err := rows.Scan(scanArgs...); err != nil {
+			if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
-			if len(batchRows) == 0 {
+				return rowsRead, err
-				return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
 			}
 
 			lastRow := batchRows[len(batchRows)-1]
-
+			return rowsRead, errorFromLastPartitionRow(lastRow, indexPrimaryKey, partition, err)
-			select {
-			case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
-			case <-ctx.Done():
-				return rowsRead, ctx.Err()
-			}
-
-			return rowsRead, errorFromLastRow(lastRow, indexPrimaryKey, partition, err)
 		}
 		rowsRead++
 
-		batchRows = append(batchRows, rowValues)
+		batchRows = append(batchRows, values)
 		if len(batchRows) >= batchSize {
-			select {
+			if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
-			case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
+				return rowsRead, err
-			case <-ctx.Done():
-				return rowsRead, ctx.Err()
 			}
-
-			batchRows = make([]models.UnknownRowValues, 0, batchSize)
-		}
-
-	}
-
-	if err := rows.Err(); err != nil {
-		if errors.Is(err, ctx.Err()) {
-			return rowsRead, ctx.Err()
-		}
-
-		if len(batchRows) > 0 {
-			lastRow := batchRows[len(batchRows)-1]
-			return rowsRead, errorFromLastRow(lastRow, indexPrimaryKey, partition, err)
-		}
-
-		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
-	}
-
-	if len(batchRows) > 0 {
-		select {
-		case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
-		case <-ctx.Done():
-			return rowsRead, ctx.Err()
 		}
 	}
 
-	return rowsRead, nil
+	if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
+		return rowsRead, err
+	}
+
+	return rowsRead, rows.Err()
 }

internal/app/etl/extractors/postgres.go

@@ -2,6 +2,7 @@ package extractors
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 
@@ -21,15 +22,7 @@ func NewPostgresExtractor(db dbwrapper.DbWrapper) etl.Extractor {
 	return &PostgresExtractor{db: db}
 }
 
-func buildExtractQueryPostgres(
+func buildExtractQueryPostgres(sourceDbInfo config.SourceTableInfo, columns []models.ColumnType) string {
-	sourceDbInfo config.SourceTableInfo,
-	columns []models.ColumnType,
-	includeRange bool,
-	isMinInclusive bool,
-	isMaxInclusive bool,
-	hasMin bool,
-	hasMax bool,
-) string {
 	var sbColumns strings.Builder
 
 	if len(columns) == 0 {
@@ -54,41 +47,7 @@ func buildExtractQueryPostgres(
 		}
 	}
 
-	query := fmt.Sprintf(`SELECT %s FROM "%s"."%s"`, sbColumns.String(), sourceDbInfo.Schema, sourceDbInfo.Table)
+	return fmt.Sprintf(`SELECT %s FROM "%s"."%s"  ORDER BY "%s" ASC`, sbColumns.String(), sourceDbInfo.Schema, sourceDbInfo.Table, sourceDbInfo.PrimaryKey)
-
-	if includeRange && (hasMin || hasMax) {
-		query += " WHERE "
-		paramIdx := 1
-
-		if hasMin {
-			query += fmt.Sprintf(`"%s"`, sourceDbInfo.PrimaryKey)
-			if isMinInclusive {
-				query += " >="
-			} else {
-				query += " >"
-			}
-			query += fmt.Sprintf(" $%d", paramIdx)
-			paramIdx++
-		}
-
-		if hasMin && hasMax {
-			query += " AND "
-		}
-
-		if hasMax {
-			query += fmt.Sprintf(`"%s"`, sourceDbInfo.PrimaryKey)
-			if isMaxInclusive {
-				query += " <="
-			} else {
-				query += " <"
-			}
-			query += fmt.Sprintf(" $%d", paramIdx)
-		}
-	}
-
-	query += fmt.Sprintf(` ORDER BY "%s" ASC`, sourceDbInfo.PrimaryKey)
-
-	return query
 }
 
 func (postgresEx *PostgresExtractor) Exec(
@@ -99,21 +58,15 @@ func (postgresEx *PostgresExtractor) Exec(
 	partition models.Partition,
 	indexPrimaryKey int,
 	chBatchesOut chan<- models.Batch,
-) (int, error) {
+) (int64, error) {
-	hasMin := partition.HasRange && partition.Range.Min > 0
+	query := buildExtractQueryPostgres(tableInfo, columns)
-	hasMax := partition.HasRange && partition.Range.Max > 0
-	query := buildExtractQueryPostgres(tableInfo, columns, partition.HasRange, partition.Range.IsMinInclusive, partition.Range.IsMaxInclusive, hasMin, hasMax)
 
-	var queryArgs []any
+	if partition.HasRange {
-	if hasMin {
+		return 0, errors.New("Batch config not yet supported")
-		queryArgs = append(queryArgs, partition.Range.Min)
-	}
-	if hasMax {
-		queryArgs = append(queryArgs, partition.Range.Max)
 	}
 
-	rowsRead := 0
+	var rowsRead int64 = 0
-	rows, err := postgresEx.db.Query(ctx, query, queryArgs...)
+	rows, err := postgresEx.db.Query(ctx, query)
 	if err != nil {
 		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
 	}
@@ -124,7 +77,7 @@ func (postgresEx *PostgresExtractor) Exec(
 	for rows.Next() {
 		values, err := rows.Values()
 		if err != nil {
-			return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
+			return rowsRead, errors.New("Unexpected error reading rows from source")
 		}
 		rowsRead++
 
@@ -142,7 +95,7 @@ func (postgresEx *PostgresExtractor) Exec(
 	}
 
 	if err := rows.Err(); err != nil {
-		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
+		return rowsRead, errors.New("Unexpected error reading rows from source")
 	}
 
 	if len(batchRows) > 0 {

internal/app/etl/loaders/postgres.go

@@ -15,21 +15,31 @@ import (
 	"github.com/jackc/pgx/v5/pgconn"
 )
 
-type GenericLoader struct {
+type PostgresLoader struct {
 	db dbwrapper.DbWrapper
 }
 
-func NewGenericLoader(db dbwrapper.DbWrapper) etl.Loader {
+func NewPostgresLoader(db dbwrapper.DbWrapper) etl.Loader {
-	return &GenericLoader{db: db}
+	return &PostgresLoader{db: db}
 }
 
-func (gl *GenericLoader) ProcessBatch(
+func mapSlice[T any, V any](input []T, mapper func(T) V) []V {
+	result := make([]V, len(input))
+
+	for i, v := range input {
+		result[i] = mapper(v)
+	}
+
+	return result
+}
+
+func (postgresLd *PostgresLoader) ProcessBatch(
 	ctx context.Context,
 	tableInfo config.TargetTableInfo,
 	colNames []string,
 	batch models.Batch,
 ) (int, error) {
-	_, err := gl.db.SaveMassive(
+	_, err := postgresLd.db.SaveMassive(
 		ctx,
 		tableInfo.Schema,
 		tableInfo.Table,
@@ -55,7 +65,7 @@ func (gl *GenericLoader) ProcessBatch(
 	return len(batch.Rows), nil
 }
 
-func (gl *GenericLoader) Exec(
+func (postgresLd *PostgresLoader) Exec(
 	ctx context.Context,
 	tableInfo config.TargetTableInfo,
 	columns []models.ColumnType,
@@ -82,7 +92,7 @@ func (gl *GenericLoader) Exec(
 				return
 			}
 
-			processedRows, err := gl.ProcessBatch(ctx, tableInfo, colNames, batch)
+			processedRows, err := postgresLd.ProcessBatch(ctx, tableInfo, colNames, batch)
 
 			if err != nil {
 				var ldError *custom_errors.LoaderError

internal/app/etl/loaders/types.go

@@ -0,0 +1 @@
+package loaders

internal/app/etl/loaders/utils.go

@@ -1,11 +0,0 @@
-package loaders
-
-func mapSlice[T any, V any](input []T, mapper func(T) V) []V {
-	result := make([]V, len(input))
-
-	for i, v := range input {
-		result[i] = mapper(v)
-	}
-
-	return result
-}

internal/app/etl/table_analyzers/main.go

@@ -15,22 +15,7 @@ func PartitionRangeGenerator(
 	tableInfo config.TableInfo,
 	partitionColumn string,
 	rowsPerPartition int64,
-	jobRange config.RangeConfig,
 ) ([]models.Partition, error) {
-	if jobRange.Min > 0 {
-		return []models.Partition{{
-			Id:           uuid.New(),
-			HasRange:     true,
-			RetryCounter: 0,
-			Range: models.PartitionRange{
-				Min:            jobRange.Min,
-				Max:            jobRange.Max,
-				IsMinInclusive: jobRange.IsMinInclusive,
-				IsMaxInclusive: jobRange.IsMaxInclusive,
-			},
-		}}, nil
-	}
-
 	rowsCount, err := tableAnalyzer.EstimateTotalRows(ctx, tableInfo)
 	if err != nil {
 		return nil, err

internal/app/etl/transformers/mssql.go

@@ -3,32 +3,18 @@ package transformers
 import (
 	"context"
 	"errors"
-	"fmt"
-	"strings"
 	"sync"
 	"time"
 
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/azure"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
-	"github.com/google/uuid"
-	log "github.com/sirupsen/logrus"
 )
 
-type MssqlTransformer struct {
+type MssqlTransformer struct{}
-	toStorage   config.ToStorageConfig
-	sourceTable config.SourceTableInfo
-	azureClient *azure.Client
-}
 
-func NewMssqlTransformer(toStorage config.ToStorageConfig, sourceTable config.SourceTableInfo, azureClient *azure.Client) etl.Transformer {
+func NewMssqlTransformer() etl.Transformer {
-	return &MssqlTransformer{
+	return &MssqlTransformer{}
-		toStorage:   toStorage,
-		sourceTable: sourceTable,
-		azureClient: azureClient,
-	}
 }
 
 func computeTransformationPlan(columns []models.ColumnType) []etl.ColumnTransformPlan {
@@ -74,63 +60,6 @@ func computeTransformationPlan(columns []models.ColumnType) []etl.ColumnTransfor
 	return plan
 }
 
-func computeStorageTransformationPlan(
-	ctx context.Context,
-	azureClient *azure.Client,
-	toStorage config.ToStorageConfig,
-	sourceColumns []models.ColumnType,
-	sourceTable config.SourceTableInfo,
-) []etl.ColumnTransformPlan {
-	if azureClient == nil || len(toStorage.Columns) == 0 {
-		return nil
-	}
-
-	colIndex := make(map[string]int, len(sourceColumns))
-	for i, col := range sourceColumns {
-		colIndex[strings.ToUpper(col.Name())] = i
-	}
-
-	var plan []etl.ColumnTransformPlan
-	for _, storageCol := range toStorage.Columns {
-		if storageCol.Mode != "REFERENCE_ONLY" {
-			log.Warnf("to_storage: unsupported mode %q for column %s — skipping", storageCol.Mode, storageCol.Source)
-			continue
-		}
-
-		idx, ok := colIndex[strings.ToUpper(storageCol.Source)]
-		if !ok {
-			log.Warnf("to_storage: source column %q not found in source schema — skipping", storageCol.Source)
-			continue
-		}
-
-		sourceColName := storageCol.Source
-		schema := sourceTable.Schema
-		table := sourceTable.Table
-
-		plan = append(plan, etl.ColumnTransformPlan{
-			Index: idx,
-			Fn: func(v any) (any, error) {
-				if v == nil {
-					return nil, nil
-				}
-				b, ok := v.([]byte)
-				if !ok {
-					log.Warnf("to_storage: expected []byte for %s.%s.%s, got %T — passing through",
-						schema, table, sourceColName, v)
-					return v, nil
-				}
-				blobPath := fmt.Sprintf("%s/%s/%s/%s.bin", schema, table, sourceColName, uuid.New().String())
-				blobURL, err := azureClient.UploadAndGetURL(ctx, blobPath, b)
-				if err != nil {
-					return nil, fmt.Errorf("uploading %s.%s.%s: %w", schema, table, sourceColName, err)
-				}
-				return blobURL, nil
-			},
-		})
-	}
-	return plan
-}
-
 const processBatchCtxCheck = 4096
 
 func (mssqlTr *MssqlTransformer) ProcessBatch(
@@ -145,6 +74,10 @@ func (mssqlTr *MssqlTransformer) ProcessBatch(
 			}
 		}
 
+		if rowValues == nil {
+			continue
+		}
+
 		for _, task := range transformationPlan {
 			val := rowValues[task.Index]
 			if val == nil {
@@ -171,8 +104,6 @@ func (mssqlTr *MssqlTransformer) Exec(
 	wgActiveBatches *sync.WaitGroup,
 ) {
 	transformationPlan := computeTransformationPlan(columns)
-	storagePlan := computeStorageTransformationPlan(ctx, mssqlTr.azureClient, mssqlTr.toStorage, columns, mssqlTr.sourceTable)
-	transformationPlan = append(transformationPlan, storagePlan...)
 
 	for {
 		if ctx.Err() != nil {

internal/app/etl/types.go

@@ -18,7 +18,7 @@ type Extractor interface {
 		partition models.Partition,
 		indexPrimaryKey int,
 		chBatchesOut chan<- models.Batch,
-	) (int, error)
+	) (int64, error)
 }
 
 type TransformerFunc func(any) (any, error)

internal/app/models/main.go

@@ -1,10 +1,6 @@
 package models
 
-import (
+import "github.com/google/uuid"
-	"time"
-
-	"github.com/google/uuid"
-)
 
 type UnknownRowValues = []any
 
@@ -29,13 +25,3 @@ type Partition struct {
 	HasRange     bool
 	RetryCounter int
 }
-
-type JobResult struct {
-	JobName    string
-	StartTime  time.Time
-	Duration   time.Duration
-	RowsRead   int64
-	RowsLoaded int64
-	RowsFailed int64
-	Error      error
-}

scripts/az-blob/main.go

@@ -1,44 +0,0 @@
-package main
-
-import (
-	"context"
-	"fmt"
-	"log"
-	"math/rand"
-	"sync"
-
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/azure"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-)
-
-func main() {
-	cfg := config.App.AzureStorage
-	containerName := cfg.Container
-
-	client, err := azure.NewClient(cfg)
-	if err != nil {
-		log.Fatalf("Error creando cliente: %v", err)
-	}
-	ctx := context.Background()
-
-	var wg sync.WaitGroup
-
-	for i := 1; i <= 10; i++ {
-		wg.Add(1)
-		go func(id int) {
-			defer wg.Done()
-
-			blobName := fmt.Sprintf("%sarchivo-%d.txt", cfg.Prefix, id)
-			content := fmt.Sprintf("Contenido aleatorio: %d", rand.Intn(100000))
-
-			err := client.UploadBuffer(ctx, containerName, blobName, []byte(content))
-			if err != nil {
-				log.Printf("Fallo al subir %s: %v", blobName, err)
-			} else {
-				fmt.Printf("Subido exitosamente: %s\n", blobName)
-			}
-		}(i)
-	}
-
-	wg.Wait()
-}