feat: refactor migration job to use preSQL and postSQL from TargetTable; update config structure for job definitions

internal/app/config/migration.go

@@ -33,15 +33,17 @@ 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"`
@@ -54,8 +56,6 @@ type Job struct {
 	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"`
 }