use header width for sql_tables if larger than row width

d2graph/d2graph.go

@@ -805,7 +805,9 @@ func (obj *Object) GetDefaultSize(mtexts []*d2target.MText, ruler *textmeasure.R
 
 		// The rows get padded a little due to header font being larger than row font
 		dims.Height = labelDims.Height * (len(obj.SQLTable.Columns) + 1)
-		dims.Width = d2target.NamePadding + maxNameWidth + d2target.TypePadding + maxTypeWidth + d2target.TypePadding + constraintWidth
+		headerWidth := d2target.HeaderPadding + labelDims.Width + d2target.HeaderPadding
+		rowsWidth := d2target.NamePadding + maxNameWidth + d2target.TypePadding + maxTypeWidth + d2target.TypePadding + constraintWidth
+		dims.Width = go2.Max(headerWidth, rowsWidth)
 	}
 
 	return &dims, nil

d2renderers/d2svg/table.go

@@ -19,8 +19,8 @@ func tableHeader(shape d2target.Shape, box *geo.Box, text string, textWidth, tex
 	if text != "" {
 		tl := label.InsideMiddleLeft.GetPointOnBox(
 			box,
-			20,
-			textWidth,
+			float64(d2target.HeaderPadding),
+			float64(shape.Width),
 			textHeight,
 		)
 

d2target/sqltable.go

@@ -3,8 +3,9 @@ package d2target
 import "oss.terrastruct.com/d2/d2renderers/d2fonts"
 
 const (
-	NamePadding = 10
-	TypePadding = 20
+	NamePadding   = 10
+	TypePadding   = 20
+	HeaderPadding = 20
 )
 
 type SQLTable struct {