fix: readers and linting issues

pkg/readers/bun/reader.go

@@ -626,17 +626,14 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 	// - nullzero tag means the field is nullable (can be NULL in DB)
 	// - absence of nullzero means the field is NOT NULL
 	// - primitive types (int64, bool, string) are NOT NULL by default
+	column.NotNull = true
+	// Primary keys are always NOT NULL
+
 	if strings.Contains(bunTag, "nullzero") {
 		column.NotNull = false
-	} else if r.isNullableGoType(fieldType) {
-		// SqlString, SqlInt, etc. without nullzero tag means NOT NULL
-		column.NotNull = true
 	} else {
-		// Primitive types are NOT NULL by default
-		column.NotNull = true
+		column.NotNull = !r.isNullableGoType(fieldType)
 	}
-
-	// Primary keys are always NOT NULL
 	if column.IsPrimaryKey {
 		column.NotNull = true
 	}