diff --git a/db_information.go b/db_information.go
index f0f6bb1..cffb37c 100644
--- a/db_information.go
+++ b/db_information.go
@@ -225,6 +225,11 @@ func (db *DB) CheckSchema(ctx context.Context) error {
 				return fmt.Errorf("column %q in table %q not found in schema", col.Name, tableName)
 			}
 
+			if column.Unique { // modify it, so checks are correct.
+				column.UniqueIndex = fmt.Sprintf("%s_%s_key", tableName, column.Name)
+				column.Unique = false
+			}
+
 			if expected, got := col.FieldTagString(false), column.FieldTagString(false); expected != got {
 				return fmt.Errorf("column %q in table %q has wrong field tag: db:\n%s\nvs code:\n%s", col.Name, tableName, expected, got)
 			}
diff --git a/desc/column.go b/desc/column.go
index 94747dc..8f3d25b 100644
--- a/desc/column.go
+++ b/desc/column.go
@@ -144,8 +144,10 @@ func (c *Column) FieldTagString(strict bool) string {
 
 	writeTagProp(b, ",unique", c.Unique)
 	writeTagProp(b, ",conflict=%s", c.Conflict)
-	writeTagProp(b, ",username", c.Username)
-	writeTagProp(b, ",password", c.Password)
+	if strict {
+		writeTagProp(b, ",username", c.Username)
+		writeTagProp(b, ",password", c.Password)
+	}
 
 	if tb := c.ReferenceTableName; tb != "" {
 		// write the ref line.
@@ -169,8 +171,8 @@ func (c *Column) FieldTagString(strict bool) string {
 
 	writeTagProp(b, ",unique_index=%s", c.UniqueIndex)
 	writeTagProp(b, ",check=%s", c.CheckConstraint)
-	writeTagProp(b, ",auto", c.AutoGenerated)
 	if strict {
+		writeTagProp(b, ",auto", c.AutoGenerated)
 		writeTagProp(b, ",presenter", c.Presenter)
 		writeTagProp(b, ",unscannable", c.Unscannable)
 	}
diff --git a/desc/struct_table.go b/desc/struct_table.go
index e2dd29e..8dc7c3f 100644
--- a/desc/struct_table.go
+++ b/desc/struct_table.go
@@ -254,6 +254,7 @@ func convertStructFieldToColumnDefinion(tableName string, field reflect.StructFi
 
 	if c.PrimaryKey && !c.Nullable && c.Type == UUID && c.Default == "" {
 		c.Default = genRandomUUIDPGCryptoFunction1
+		// c.AutoGenerated = true
 	}
 
 	if c.Password && c.Type == InvalidDataType {
diff --git a/desc/update_query.go b/desc/update_query.go
index ed57d0b..d9cc793 100644
--- a/desc/update_query.go
+++ b/desc/update_query.go
@@ -14,8 +14,20 @@ func BuildUpdateQuery(value any, columnsToUpdate []string, primaryKey *Column) (
 		return "", nil, err
 	}
 
+	shouldUpdateID := false
+	for _, col := range columnsToUpdate {
+		if col == primaryKey.Name {
+			shouldUpdateID = true
+			break
+		}
+	}
+
+	if len(args) == 1 { // the last one is the id.
+		return "", nil, fmt.Errorf("no arguments found for update, maybe missing struct field tag of \"%s\"", DefaultTag)
+	}
+
 	// build the SQL query using the table definition and its primary key.
-	query := buildUpdateQuery(primaryKey.Table, args, primaryKey.Name)
+	query := buildUpdateQuery(primaryKey.Table, args, primaryKey.Name, shouldUpdateID)
 	return query, args.Values(), nil
 }
 
@@ -61,7 +73,7 @@ func extractUpdateArguments(value any, columnsToUpdate []string, primaryKey *Col
 	return args, nil
 }
 
-func buildUpdateQuery(td *Table, args Arguments, primaryKeyName string) string {
+func buildUpdateQuery(td *Table, args Arguments, primaryKeyName string, shouldUpdateID bool) string {
 	var b strings.Builder
 
 	b.WriteString(`UPDATE "` + td.Name + `" SET `)
@@ -71,6 +83,12 @@ func buildUpdateQuery(td *Table, args Arguments, primaryKeyName string) string {
 	for i, a := range args {
 		c := a.Column
 
+		if !shouldUpdateID && c.Name == primaryKeyName {
+			// Do not update ID if not specifically asked to.
+			// Fixes #1.
+			continue
+		}
+
 		if i > 0 {
 			b.WriteByte(',')
 		}